1586 lines
44 KiB
C++
1586 lines
44 KiB
C++
// <bitset> -*- C++ -*-
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// Copyright (C) 2001-2013 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 3, or (at your option)
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// any later version.
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// Under Section 7 of GPL version 3, you are granted additional
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// permissions described in the GCC Runtime Library Exception, version
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// 3.1, as published by the Free Software Foundation.
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// You should have received a copy of the GNU General Public License and
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// a copy of the GCC Runtime Library Exception along with this program;
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// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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// <http://www.gnu.org/licenses/>.
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/*
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* Copyright (c) 1998
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* Silicon Graphics Computer Systems, Inc.
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*
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* Permission to use, copy, modify, distribute and sell this software
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* and its documentation for any purpose is hereby granted without fee,
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* provided that the above copyright notice appear in all copies and
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* that both that copyright notice and this permission notice appear
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* in supporting documentation. Silicon Graphics makes no
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* representations about the suitability of this software for any
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* purpose. It is provided "as is" without express or implied warranty.
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*/
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/** @file include/bitset
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* This is a Standard C++ Library header.
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*/
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#ifndef _GLIBCXX_BITSET
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#define _GLIBCXX_BITSET 1
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#pragma GCC system_header
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#include <string>
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#include <bits/functexcept.h> // For invalid_argument, out_of_range,
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// overflow_error
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#include <iosfwd>
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#include <bits/cxxabi_forced.h>
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#define _GLIBCXX_BITSET_BITS_PER_WORD (__CHAR_BIT__ * __SIZEOF_LONG__)
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#define _GLIBCXX_BITSET_WORDS(__n) \
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((__n) / _GLIBCXX_BITSET_BITS_PER_WORD + \
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((__n) % _GLIBCXX_BITSET_BITS_PER_WORD == 0 ? 0 : 1))
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#define _GLIBCXX_BITSET_BITS_PER_ULL (__CHAR_BIT__ * __SIZEOF_LONG_LONG__)
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namespace std _GLIBCXX_VISIBILITY(default)
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{
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_GLIBCXX_BEGIN_NAMESPACE_CONTAINER
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/**
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* Base class, general case. It is a class invariant that _Nw will be
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* nonnegative.
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*
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* See documentation for bitset.
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*/
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template<size_t _Nw>
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struct _Base_bitset
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{
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typedef unsigned long _WordT;
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/// 0 is the least significant word.
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_WordT _M_w[_Nw];
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_GLIBCXX_CONSTEXPR _Base_bitset() _GLIBCXX_NOEXCEPT
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: _M_w() { }
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#if __cplusplus >= 201103L
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constexpr _Base_bitset(unsigned long long __val) noexcept
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: _M_w{ _WordT(__val)
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#if __SIZEOF_LONG_LONG__ > __SIZEOF_LONG__
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, _WordT(__val >> _GLIBCXX_BITSET_BITS_PER_WORD)
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#endif
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} { }
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#else
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_Base_bitset(unsigned long __val)
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: _M_w()
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{ _M_w[0] = __val; }
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#endif
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static _GLIBCXX_CONSTEXPR size_t
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_S_whichword(size_t __pos) _GLIBCXX_NOEXCEPT
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{ return __pos / _GLIBCXX_BITSET_BITS_PER_WORD; }
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static _GLIBCXX_CONSTEXPR size_t
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_S_whichbyte(size_t __pos) _GLIBCXX_NOEXCEPT
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{ return (__pos % _GLIBCXX_BITSET_BITS_PER_WORD) / __CHAR_BIT__; }
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static _GLIBCXX_CONSTEXPR size_t
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_S_whichbit(size_t __pos) _GLIBCXX_NOEXCEPT
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{ return __pos % _GLIBCXX_BITSET_BITS_PER_WORD; }
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static _GLIBCXX_CONSTEXPR _WordT
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_S_maskbit(size_t __pos) _GLIBCXX_NOEXCEPT
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{ return (static_cast<_WordT>(1)) << _S_whichbit(__pos); }
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_WordT&
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_M_getword(size_t __pos) _GLIBCXX_NOEXCEPT
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{ return _M_w[_S_whichword(__pos)]; }
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_GLIBCXX_CONSTEXPR _WordT
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_M_getword(size_t __pos) const _GLIBCXX_NOEXCEPT
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{ return _M_w[_S_whichword(__pos)]; }
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#if __cplusplus >= 201103L
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const _WordT*
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_M_getdata() const noexcept
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{ return _M_w; }
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#endif
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_WordT&
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_M_hiword() _GLIBCXX_NOEXCEPT
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{ return _M_w[_Nw - 1]; }
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_GLIBCXX_CONSTEXPR _WordT
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_M_hiword() const _GLIBCXX_NOEXCEPT
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{ return _M_w[_Nw - 1]; }
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void
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_M_do_and(const _Base_bitset<_Nw>& __x) _GLIBCXX_NOEXCEPT
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{
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for (size_t __i = 0; __i < _Nw; __i++)
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_M_w[__i] &= __x._M_w[__i];
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}
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void
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_M_do_or(const _Base_bitset<_Nw>& __x) _GLIBCXX_NOEXCEPT
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{
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for (size_t __i = 0; __i < _Nw; __i++)
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_M_w[__i] |= __x._M_w[__i];
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}
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void
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_M_do_xor(const _Base_bitset<_Nw>& __x) _GLIBCXX_NOEXCEPT
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{
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for (size_t __i = 0; __i < _Nw; __i++)
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_M_w[__i] ^= __x._M_w[__i];
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}
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void
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_M_do_left_shift(size_t __shift) _GLIBCXX_NOEXCEPT;
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void
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_M_do_right_shift(size_t __shift) _GLIBCXX_NOEXCEPT;
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void
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_M_do_flip() _GLIBCXX_NOEXCEPT
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{
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for (size_t __i = 0; __i < _Nw; __i++)
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_M_w[__i] = ~_M_w[__i];
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}
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void
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_M_do_set() _GLIBCXX_NOEXCEPT
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{
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for (size_t __i = 0; __i < _Nw; __i++)
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_M_w[__i] = ~static_cast<_WordT>(0);
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}
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void
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_M_do_reset() _GLIBCXX_NOEXCEPT
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{ __builtin_memset(_M_w, 0, _Nw * sizeof(_WordT)); }
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bool
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_M_is_equal(const _Base_bitset<_Nw>& __x) const _GLIBCXX_NOEXCEPT
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{
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for (size_t __i = 0; __i < _Nw; ++__i)
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if (_M_w[__i] != __x._M_w[__i])
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return false;
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return true;
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}
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template<size_t _Nb>
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bool
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_M_are_all() const _GLIBCXX_NOEXCEPT
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{
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for (size_t __i = 0; __i < _Nw - 1; __i++)
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if (_M_w[__i] != ~static_cast<_WordT>(0))
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return false;
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return _M_hiword() == (~static_cast<_WordT>(0)
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>> (_Nw * _GLIBCXX_BITSET_BITS_PER_WORD
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- _Nb));
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}
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bool
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_M_is_any() const _GLIBCXX_NOEXCEPT
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{
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for (size_t __i = 0; __i < _Nw; __i++)
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if (_M_w[__i] != static_cast<_WordT>(0))
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return true;
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return false;
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}
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size_t
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_M_do_count() const _GLIBCXX_NOEXCEPT
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{
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size_t __result = 0;
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for (size_t __i = 0; __i < _Nw; __i++)
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__result += __builtin_popcountl(_M_w[__i]);
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return __result;
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}
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unsigned long
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_M_do_to_ulong() const;
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#if __cplusplus >= 201103L
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unsigned long long
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_M_do_to_ullong() const;
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#endif
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// find first "on" bit
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size_t
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_M_do_find_first(size_t) const _GLIBCXX_NOEXCEPT;
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// find the next "on" bit that follows "prev"
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size_t
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_M_do_find_next(size_t, size_t) const _GLIBCXX_NOEXCEPT;
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};
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// Definitions of non-inline functions from _Base_bitset.
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template<size_t _Nw>
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void
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_Base_bitset<_Nw>::_M_do_left_shift(size_t __shift) _GLIBCXX_NOEXCEPT
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{
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if (__builtin_expect(__shift != 0, 1))
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{
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const size_t __wshift = __shift / _GLIBCXX_BITSET_BITS_PER_WORD;
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const size_t __offset = __shift % _GLIBCXX_BITSET_BITS_PER_WORD;
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if (__offset == 0)
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for (size_t __n = _Nw - 1; __n >= __wshift; --__n)
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_M_w[__n] = _M_w[__n - __wshift];
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else
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{
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const size_t __sub_offset = (_GLIBCXX_BITSET_BITS_PER_WORD
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- __offset);
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for (size_t __n = _Nw - 1; __n > __wshift; --__n)
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_M_w[__n] = ((_M_w[__n - __wshift] << __offset)
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| (_M_w[__n - __wshift - 1] >> __sub_offset));
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_M_w[__wshift] = _M_w[0] << __offset;
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}
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std::fill(_M_w + 0, _M_w + __wshift, static_cast<_WordT>(0));
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}
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}
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template<size_t _Nw>
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void
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_Base_bitset<_Nw>::_M_do_right_shift(size_t __shift) _GLIBCXX_NOEXCEPT
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{
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if (__builtin_expect(__shift != 0, 1))
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{
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const size_t __wshift = __shift / _GLIBCXX_BITSET_BITS_PER_WORD;
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const size_t __offset = __shift % _GLIBCXX_BITSET_BITS_PER_WORD;
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const size_t __limit = _Nw - __wshift - 1;
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if (__offset == 0)
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for (size_t __n = 0; __n <= __limit; ++__n)
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_M_w[__n] = _M_w[__n + __wshift];
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else
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{
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const size_t __sub_offset = (_GLIBCXX_BITSET_BITS_PER_WORD
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- __offset);
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for (size_t __n = 0; __n < __limit; ++__n)
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_M_w[__n] = ((_M_w[__n + __wshift] >> __offset)
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| (_M_w[__n + __wshift + 1] << __sub_offset));
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_M_w[__limit] = _M_w[_Nw-1] >> __offset;
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}
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std::fill(_M_w + __limit + 1, _M_w + _Nw, static_cast<_WordT>(0));
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}
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}
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template<size_t _Nw>
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unsigned long
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_Base_bitset<_Nw>::_M_do_to_ulong() const
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{
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for (size_t __i = 1; __i < _Nw; ++__i)
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if (_M_w[__i])
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__throw_overflow_error(__N("_Base_bitset::_M_do_to_ulong"));
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return _M_w[0];
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}
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#if __cplusplus >= 201103L
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template<size_t _Nw>
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unsigned long long
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_Base_bitset<_Nw>::_M_do_to_ullong() const
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{
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const bool __dw = sizeof(unsigned long long) > sizeof(unsigned long);
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for (size_t __i = 1 + __dw; __i < _Nw; ++__i)
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if (_M_w[__i])
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__throw_overflow_error(__N("_Base_bitset::_M_do_to_ullong"));
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if (__dw)
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return _M_w[0] + (static_cast<unsigned long long>(_M_w[1])
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<< _GLIBCXX_BITSET_BITS_PER_WORD);
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return _M_w[0];
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}
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#endif
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template<size_t _Nw>
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size_t
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_Base_bitset<_Nw>::
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_M_do_find_first(size_t __not_found) const _GLIBCXX_NOEXCEPT
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{
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for (size_t __i = 0; __i < _Nw; __i++)
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{
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_WordT __thisword = _M_w[__i];
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if (__thisword != static_cast<_WordT>(0))
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return (__i * _GLIBCXX_BITSET_BITS_PER_WORD
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+ __builtin_ctzl(__thisword));
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}
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// not found, so return an indication of failure.
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return __not_found;
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}
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template<size_t _Nw>
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size_t
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_Base_bitset<_Nw>::
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_M_do_find_next(size_t __prev, size_t __not_found) const _GLIBCXX_NOEXCEPT
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{
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// make bound inclusive
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++__prev;
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// check out of bounds
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if (__prev >= _Nw * _GLIBCXX_BITSET_BITS_PER_WORD)
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return __not_found;
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// search first word
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size_t __i = _S_whichword(__prev);
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_WordT __thisword = _M_w[__i];
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// mask off bits below bound
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__thisword &= (~static_cast<_WordT>(0)) << _S_whichbit(__prev);
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if (__thisword != static_cast<_WordT>(0))
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return (__i * _GLIBCXX_BITSET_BITS_PER_WORD
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+ __builtin_ctzl(__thisword));
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// check subsequent words
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__i++;
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for (; __i < _Nw; __i++)
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{
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__thisword = _M_w[__i];
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if (__thisword != static_cast<_WordT>(0))
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return (__i * _GLIBCXX_BITSET_BITS_PER_WORD
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+ __builtin_ctzl(__thisword));
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}
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// not found, so return an indication of failure.
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return __not_found;
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} // end _M_do_find_next
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/**
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* Base class, specialization for a single word.
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*
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* See documentation for bitset.
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*/
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template<>
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struct _Base_bitset<1>
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{
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typedef unsigned long _WordT;
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_WordT _M_w;
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_GLIBCXX_CONSTEXPR _Base_bitset() _GLIBCXX_NOEXCEPT
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: _M_w(0)
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{ }
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#if __cplusplus >= 201103L
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constexpr _Base_bitset(unsigned long long __val) noexcept
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#else
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_Base_bitset(unsigned long __val)
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#endif
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: _M_w(__val)
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{ }
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static _GLIBCXX_CONSTEXPR size_t
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_S_whichword(size_t __pos) _GLIBCXX_NOEXCEPT
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{ return __pos / _GLIBCXX_BITSET_BITS_PER_WORD; }
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static _GLIBCXX_CONSTEXPR size_t
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_S_whichbyte(size_t __pos) _GLIBCXX_NOEXCEPT
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{ return (__pos % _GLIBCXX_BITSET_BITS_PER_WORD) / __CHAR_BIT__; }
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static _GLIBCXX_CONSTEXPR size_t
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_S_whichbit(size_t __pos) _GLIBCXX_NOEXCEPT
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{ return __pos % _GLIBCXX_BITSET_BITS_PER_WORD; }
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static _GLIBCXX_CONSTEXPR _WordT
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_S_maskbit(size_t __pos) _GLIBCXX_NOEXCEPT
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{ return (static_cast<_WordT>(1)) << _S_whichbit(__pos); }
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_WordT&
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_M_getword(size_t) _GLIBCXX_NOEXCEPT
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{ return _M_w; }
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_GLIBCXX_CONSTEXPR _WordT
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_M_getword(size_t) const _GLIBCXX_NOEXCEPT
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{ return _M_w; }
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#if __cplusplus >= 201103L
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const _WordT*
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_M_getdata() const noexcept
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{ return &_M_w; }
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#endif
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_WordT&
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_M_hiword() _GLIBCXX_NOEXCEPT
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{ return _M_w; }
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_GLIBCXX_CONSTEXPR _WordT
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_M_hiword() const _GLIBCXX_NOEXCEPT
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{ return _M_w; }
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void
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_M_do_and(const _Base_bitset<1>& __x) _GLIBCXX_NOEXCEPT
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{ _M_w &= __x._M_w; }
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void
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_M_do_or(const _Base_bitset<1>& __x) _GLIBCXX_NOEXCEPT
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{ _M_w |= __x._M_w; }
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void
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_M_do_xor(const _Base_bitset<1>& __x) _GLIBCXX_NOEXCEPT
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{ _M_w ^= __x._M_w; }
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void
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_M_do_left_shift(size_t __shift) _GLIBCXX_NOEXCEPT
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{ _M_w <<= __shift; }
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void
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_M_do_right_shift(size_t __shift) _GLIBCXX_NOEXCEPT
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{ _M_w >>= __shift; }
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void
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_M_do_flip() _GLIBCXX_NOEXCEPT
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{ _M_w = ~_M_w; }
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void
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_M_do_set() _GLIBCXX_NOEXCEPT
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{ _M_w = ~static_cast<_WordT>(0); }
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void
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_M_do_reset() _GLIBCXX_NOEXCEPT
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{ _M_w = 0; }
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bool
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_M_is_equal(const _Base_bitset<1>& __x) const _GLIBCXX_NOEXCEPT
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{ return _M_w == __x._M_w; }
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template<size_t _Nb>
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bool
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_M_are_all() const _GLIBCXX_NOEXCEPT
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{ return _M_w == (~static_cast<_WordT>(0)
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>> (_GLIBCXX_BITSET_BITS_PER_WORD - _Nb)); }
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bool
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_M_is_any() const _GLIBCXX_NOEXCEPT
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{ return _M_w != 0; }
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size_t
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_M_do_count() const _GLIBCXX_NOEXCEPT
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{ return __builtin_popcountl(_M_w); }
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unsigned long
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_M_do_to_ulong() const _GLIBCXX_NOEXCEPT
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{ return _M_w; }
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#if __cplusplus >= 201103L
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unsigned long long
|
|
_M_do_to_ullong() const noexcept
|
|
{ return _M_w; }
|
|
#endif
|
|
|
|
size_t
|
|
_M_do_find_first(size_t __not_found) const _GLIBCXX_NOEXCEPT
|
|
{
|
|
if (_M_w != 0)
|
|
return __builtin_ctzl(_M_w);
|
|
else
|
|
return __not_found;
|
|
}
|
|
|
|
// find the next "on" bit that follows "prev"
|
|
size_t
|
|
_M_do_find_next(size_t __prev, size_t __not_found) const
|
|
_GLIBCXX_NOEXCEPT
|
|
{
|
|
++__prev;
|
|
if (__prev >= ((size_t) _GLIBCXX_BITSET_BITS_PER_WORD))
|
|
return __not_found;
|
|
|
|
_WordT __x = _M_w >> __prev;
|
|
if (__x != 0)
|
|
return __builtin_ctzl(__x) + __prev;
|
|
else
|
|
return __not_found;
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Base class, specialization for no storage (zero-length %bitset).
|
|
*
|
|
* See documentation for bitset.
|
|
*/
|
|
template<>
|
|
struct _Base_bitset<0>
|
|
{
|
|
typedef unsigned long _WordT;
|
|
|
|
_GLIBCXX_CONSTEXPR _Base_bitset() _GLIBCXX_NOEXCEPT
|
|
{ }
|
|
|
|
#if __cplusplus >= 201103L
|
|
constexpr _Base_bitset(unsigned long long) noexcept
|
|
#else
|
|
_Base_bitset(unsigned long)
|
|
#endif
|
|
{ }
|
|
|
|
static _GLIBCXX_CONSTEXPR size_t
|
|
_S_whichword(size_t __pos) _GLIBCXX_NOEXCEPT
|
|
{ return __pos / _GLIBCXX_BITSET_BITS_PER_WORD; }
|
|
|
|
static _GLIBCXX_CONSTEXPR size_t
|
|
_S_whichbyte(size_t __pos) _GLIBCXX_NOEXCEPT
|
|
{ return (__pos % _GLIBCXX_BITSET_BITS_PER_WORD) / __CHAR_BIT__; }
|
|
|
|
static _GLIBCXX_CONSTEXPR size_t
|
|
_S_whichbit(size_t __pos) _GLIBCXX_NOEXCEPT
|
|
{ return __pos % _GLIBCXX_BITSET_BITS_PER_WORD; }
|
|
|
|
static _GLIBCXX_CONSTEXPR _WordT
|
|
_S_maskbit(size_t __pos) _GLIBCXX_NOEXCEPT
|
|
{ return (static_cast<_WordT>(1)) << _S_whichbit(__pos); }
|
|
|
|
// This would normally give access to the data. The bounds-checking
|
|
// in the bitset class will prevent the user from getting this far,
|
|
// but (1) it must still return an lvalue to compile, and (2) the
|
|
// user might call _Unchecked_set directly, in which case this /needs/
|
|
// to fail. Let's not penalize zero-length users unless they actually
|
|
// make an unchecked call; all the memory ugliness is therefore
|
|
// localized to this single should-never-get-this-far function.
|
|
_WordT&
|
|
_M_getword(size_t) _GLIBCXX_NOEXCEPT
|
|
{
|
|
__throw_out_of_range(__N("_Base_bitset::_M_getword"));
|
|
return *new _WordT;
|
|
}
|
|
|
|
_GLIBCXX_CONSTEXPR _WordT
|
|
_M_getword(size_t __pos) const _GLIBCXX_NOEXCEPT
|
|
{ return 0; }
|
|
|
|
_GLIBCXX_CONSTEXPR _WordT
|
|
_M_hiword() const _GLIBCXX_NOEXCEPT
|
|
{ return 0; }
|
|
|
|
void
|
|
_M_do_and(const _Base_bitset<0>&) _GLIBCXX_NOEXCEPT
|
|
{ }
|
|
|
|
void
|
|
_M_do_or(const _Base_bitset<0>&) _GLIBCXX_NOEXCEPT
|
|
{ }
|
|
|
|
void
|
|
_M_do_xor(const _Base_bitset<0>&) _GLIBCXX_NOEXCEPT
|
|
{ }
|
|
|
|
void
|
|
_M_do_left_shift(size_t) _GLIBCXX_NOEXCEPT
|
|
{ }
|
|
|
|
void
|
|
_M_do_right_shift(size_t) _GLIBCXX_NOEXCEPT
|
|
{ }
|
|
|
|
void
|
|
_M_do_flip() _GLIBCXX_NOEXCEPT
|
|
{ }
|
|
|
|
void
|
|
_M_do_set() _GLIBCXX_NOEXCEPT
|
|
{ }
|
|
|
|
void
|
|
_M_do_reset() _GLIBCXX_NOEXCEPT
|
|
{ }
|
|
|
|
// Are all empty bitsets equal to each other? Are they equal to
|
|
// themselves? How to compare a thing which has no state? What is
|
|
// the sound of one zero-length bitset clapping?
|
|
bool
|
|
_M_is_equal(const _Base_bitset<0>&) const _GLIBCXX_NOEXCEPT
|
|
{ return true; }
|
|
|
|
template<size_t _Nb>
|
|
bool
|
|
_M_are_all() const _GLIBCXX_NOEXCEPT
|
|
{ return true; }
|
|
|
|
bool
|
|
_M_is_any() const _GLIBCXX_NOEXCEPT
|
|
{ return false; }
|
|
|
|
size_t
|
|
_M_do_count() const _GLIBCXX_NOEXCEPT
|
|
{ return 0; }
|
|
|
|
unsigned long
|
|
_M_do_to_ulong() const _GLIBCXX_NOEXCEPT
|
|
{ return 0; }
|
|
|
|
#if __cplusplus >= 201103L
|
|
unsigned long long
|
|
_M_do_to_ullong() const noexcept
|
|
{ return 0; }
|
|
#endif
|
|
|
|
// Normally "not found" is the size, but that could also be
|
|
// misinterpreted as an index in this corner case. Oh well.
|
|
size_t
|
|
_M_do_find_first(size_t) const _GLIBCXX_NOEXCEPT
|
|
{ return 0; }
|
|
|
|
size_t
|
|
_M_do_find_next(size_t, size_t) const _GLIBCXX_NOEXCEPT
|
|
{ return 0; }
|
|
};
|
|
|
|
|
|
// Helper class to zero out the unused high-order bits in the highest word.
|
|
template<size_t _Extrabits>
|
|
struct _Sanitize
|
|
{
|
|
typedef unsigned long _WordT;
|
|
|
|
static void
|
|
_S_do_sanitize(_WordT& __val) _GLIBCXX_NOEXCEPT
|
|
{ __val &= ~((~static_cast<_WordT>(0)) << _Extrabits); }
|
|
};
|
|
|
|
template<>
|
|
struct _Sanitize<0>
|
|
{
|
|
typedef unsigned long _WordT;
|
|
|
|
static void
|
|
_S_do_sanitize(_WordT) _GLIBCXX_NOEXCEPT { }
|
|
};
|
|
|
|
#if __cplusplus >= 201103L
|
|
template<size_t _Nb, bool = _Nb < _GLIBCXX_BITSET_BITS_PER_ULL>
|
|
struct _Sanitize_val
|
|
{
|
|
static constexpr unsigned long long
|
|
_S_do_sanitize_val(unsigned long long __val)
|
|
{ return __val; }
|
|
};
|
|
|
|
template<size_t _Nb>
|
|
struct _Sanitize_val<_Nb, true>
|
|
{
|
|
static constexpr unsigned long long
|
|
_S_do_sanitize_val(unsigned long long __val)
|
|
{ return __val & ~((~static_cast<unsigned long long>(0)) << _Nb); }
|
|
};
|
|
#endif
|
|
|
|
/**
|
|
* The %bitset class represents a @e fixed-size sequence of bits.
|
|
*
|
|
* @ingroup containers
|
|
*
|
|
* (Note that %bitset does @e not meet the formal requirements of a
|
|
* <a href="tables.html#65">container</a>. Mainly, it lacks iterators.)
|
|
*
|
|
* The template argument, @a Nb, may be any non-negative number,
|
|
* specifying the number of bits (e.g., "0", "12", "1024*1024").
|
|
*
|
|
* In the general unoptimized case, storage is allocated in word-sized
|
|
* blocks. Let B be the number of bits in a word, then (Nb+(B-1))/B
|
|
* words will be used for storage. B - Nb%B bits are unused. (They are
|
|
* the high-order bits in the highest word.) It is a class invariant
|
|
* that those unused bits are always zero.
|
|
*
|
|
* If you think of %bitset as <em>a simple array of bits</em>, be
|
|
* aware that your mental picture is reversed: a %bitset behaves
|
|
* the same way as bits in integers do, with the bit at index 0 in
|
|
* the <em>least significant / right-hand</em> position, and the bit at
|
|
* index Nb-1 in the <em>most significant / left-hand</em> position.
|
|
* Thus, unlike other containers, a %bitset's index <em>counts from
|
|
* right to left</em>, to put it very loosely.
|
|
*
|
|
* This behavior is preserved when translating to and from strings. For
|
|
* example, the first line of the following program probably prints
|
|
* <em>b('a') is 0001100001</em> on a modern ASCII system.
|
|
*
|
|
* @code
|
|
* #include <bitset>
|
|
* #include <iostream>
|
|
* #include <sstream>
|
|
*
|
|
* using namespace std;
|
|
*
|
|
* int main()
|
|
* {
|
|
* long a = 'a';
|
|
* bitset<10> b(a);
|
|
*
|
|
* cout << "b('a') is " << b << endl;
|
|
*
|
|
* ostringstream s;
|
|
* s << b;
|
|
* string str = s.str();
|
|
* cout << "index 3 in the string is " << str[3] << " but\n"
|
|
* << "index 3 in the bitset is " << b[3] << endl;
|
|
* }
|
|
* @endcode
|
|
*
|
|
* Also see:
|
|
* http://gcc.gnu.org/onlinedocs/libstdc++/manual/bk01pt12ch33s02.html
|
|
* for a description of extensions.
|
|
*
|
|
* Most of the actual code isn't contained in %bitset<> itself, but in the
|
|
* base class _Base_bitset. The base class works with whole words, not with
|
|
* individual bits. This allows us to specialize _Base_bitset for the
|
|
* important special case where the %bitset is only a single word.
|
|
*
|
|
* Extra confusion can result due to the fact that the storage for
|
|
* _Base_bitset @e is a regular array, and is indexed as such. This is
|
|
* carefully encapsulated.
|
|
*/
|
|
template<size_t _Nb>
|
|
class bitset
|
|
: private _Base_bitset<_GLIBCXX_BITSET_WORDS(_Nb)>
|
|
{
|
|
private:
|
|
typedef _Base_bitset<_GLIBCXX_BITSET_WORDS(_Nb)> _Base;
|
|
typedef unsigned long _WordT;
|
|
|
|
void
|
|
_M_do_sanitize() _GLIBCXX_NOEXCEPT
|
|
{
|
|
typedef _Sanitize<_Nb % _GLIBCXX_BITSET_BITS_PER_WORD> __sanitize_type;
|
|
__sanitize_type::_S_do_sanitize(this->_M_hiword());
|
|
}
|
|
|
|
#if __cplusplus >= 201103L
|
|
template<typename> friend class hash;
|
|
#endif
|
|
|
|
public:
|
|
/**
|
|
* This encapsulates the concept of a single bit. An instance of this
|
|
* class is a proxy for an actual bit; this way the individual bit
|
|
* operations are done as faster word-size bitwise instructions.
|
|
*
|
|
* Most users will never need to use this class directly; conversions
|
|
* to and from bool are automatic and should be transparent. Overloaded
|
|
* operators help to preserve the illusion.
|
|
*
|
|
* (On a typical system, this <em>bit %reference</em> is 64
|
|
* times the size of an actual bit. Ha.)
|
|
*/
|
|
class reference
|
|
{
|
|
friend class bitset;
|
|
|
|
_WordT* _M_wp;
|
|
size_t _M_bpos;
|
|
|
|
// left undefined
|
|
reference();
|
|
|
|
public:
|
|
reference(bitset& __b, size_t __pos) _GLIBCXX_NOEXCEPT
|
|
{
|
|
_M_wp = &__b._M_getword(__pos);
|
|
_M_bpos = _Base::_S_whichbit(__pos);
|
|
}
|
|
|
|
~reference() _GLIBCXX_NOEXCEPT
|
|
{ }
|
|
|
|
// For b[i] = __x;
|
|
reference&
|
|
operator=(bool __x) _GLIBCXX_NOEXCEPT
|
|
{
|
|
if (__x)
|
|
*_M_wp |= _Base::_S_maskbit(_M_bpos);
|
|
else
|
|
*_M_wp &= ~_Base::_S_maskbit(_M_bpos);
|
|
return *this;
|
|
}
|
|
|
|
// For b[i] = b[__j];
|
|
reference&
|
|
operator=(const reference& __j) _GLIBCXX_NOEXCEPT
|
|
{
|
|
if ((*(__j._M_wp) & _Base::_S_maskbit(__j._M_bpos)))
|
|
*_M_wp |= _Base::_S_maskbit(_M_bpos);
|
|
else
|
|
*_M_wp &= ~_Base::_S_maskbit(_M_bpos);
|
|
return *this;
|
|
}
|
|
|
|
// Flips the bit
|
|
bool
|
|
operator~() const _GLIBCXX_NOEXCEPT
|
|
{ return (*(_M_wp) & _Base::_S_maskbit(_M_bpos)) == 0; }
|
|
|
|
// For __x = b[i];
|
|
operator bool() const _GLIBCXX_NOEXCEPT
|
|
{ return (*(_M_wp) & _Base::_S_maskbit(_M_bpos)) != 0; }
|
|
|
|
// For b[i].flip();
|
|
reference&
|
|
flip() _GLIBCXX_NOEXCEPT
|
|
{
|
|
*_M_wp ^= _Base::_S_maskbit(_M_bpos);
|
|
return *this;
|
|
}
|
|
};
|
|
friend class reference;
|
|
|
|
// 23.3.5.1 constructors:
|
|
/// All bits set to zero.
|
|
_GLIBCXX_CONSTEXPR bitset() _GLIBCXX_NOEXCEPT
|
|
{ }
|
|
|
|
/// Initial bits bitwise-copied from a single word (others set to zero).
|
|
#if __cplusplus >= 201103L
|
|
constexpr bitset(unsigned long long __val) noexcept
|
|
: _Base(_Sanitize_val<_Nb>::_S_do_sanitize_val(__val)) { }
|
|
#else
|
|
bitset(unsigned long __val)
|
|
: _Base(__val)
|
|
{ _M_do_sanitize(); }
|
|
#endif
|
|
|
|
/**
|
|
* Use a subset of a string.
|
|
* @param __s A string of @a 0 and @a 1 characters.
|
|
* @param __position Index of the first character in @a __s to use;
|
|
* defaults to zero.
|
|
* @throw std::out_of_range If @a pos is bigger the size of @a __s.
|
|
* @throw std::invalid_argument If a character appears in the string
|
|
* which is neither @a 0 nor @a 1.
|
|
*/
|
|
template<class _CharT, class _Traits, class _Alloc>
|
|
explicit
|
|
bitset(const std::basic_string<_CharT, _Traits, _Alloc>& __s,
|
|
size_t __position = 0)
|
|
: _Base()
|
|
{
|
|
if (__position > __s.size())
|
|
__throw_out_of_range(__N("bitset::bitset initial position "
|
|
"not valid"));
|
|
_M_copy_from_string(__s, __position,
|
|
std::basic_string<_CharT, _Traits, _Alloc>::npos,
|
|
_CharT('0'), _CharT('1'));
|
|
}
|
|
|
|
/**
|
|
* Use a subset of a string.
|
|
* @param __s A string of @a 0 and @a 1 characters.
|
|
* @param __position Index of the first character in @a __s to use.
|
|
* @param __n The number of characters to copy.
|
|
* @throw std::out_of_range If @a __position is bigger the size
|
|
* of @a __s.
|
|
* @throw std::invalid_argument If a character appears in the string
|
|
* which is neither @a 0 nor @a 1.
|
|
*/
|
|
template<class _CharT, class _Traits, class _Alloc>
|
|
bitset(const std::basic_string<_CharT, _Traits, _Alloc>& __s,
|
|
size_t __position, size_t __n)
|
|
: _Base()
|
|
{
|
|
if (__position > __s.size())
|
|
__throw_out_of_range(__N("bitset::bitset initial position "
|
|
"not valid"));
|
|
_M_copy_from_string(__s, __position, __n, _CharT('0'), _CharT('1'));
|
|
}
|
|
|
|
// _GLIBCXX_RESOLVE_LIB_DEFECTS
|
|
// 396. what are characters zero and one.
|
|
template<class _CharT, class _Traits, class _Alloc>
|
|
bitset(const std::basic_string<_CharT, _Traits, _Alloc>& __s,
|
|
size_t __position, size_t __n,
|
|
_CharT __zero, _CharT __one = _CharT('1'))
|
|
: _Base()
|
|
{
|
|
if (__position > __s.size())
|
|
__throw_out_of_range(__N("bitset::bitset initial position "
|
|
"not valid"));
|
|
_M_copy_from_string(__s, __position, __n, __zero, __one);
|
|
}
|
|
|
|
#if __cplusplus >= 201103L
|
|
/**
|
|
* Construct from a character %array.
|
|
* @param __str An %array of characters @a zero and @a one.
|
|
* @param __n The number of characters to use.
|
|
* @param __zero The character corresponding to the value 0.
|
|
* @param __one The character corresponding to the value 1.
|
|
* @throw std::invalid_argument If a character appears in the string
|
|
* which is neither @a __zero nor @a __one.
|
|
*/
|
|
template<typename _CharT>
|
|
explicit
|
|
bitset(const _CharT* __str,
|
|
typename std::basic_string<_CharT>::size_type __n
|
|
= std::basic_string<_CharT>::npos,
|
|
_CharT __zero = _CharT('0'), _CharT __one = _CharT('1'))
|
|
: _Base()
|
|
{
|
|
if (!__str)
|
|
__throw_logic_error(__N("bitset::bitset(const _CharT*, ...)"));
|
|
|
|
if (__n == std::basic_string<_CharT>::npos)
|
|
__n = std::char_traits<_CharT>::length(__str);
|
|
_M_copy_from_ptr<_CharT, std::char_traits<_CharT>>(__str, __n, 0,
|
|
__n, __zero,
|
|
__one);
|
|
}
|
|
#endif
|
|
|
|
// 23.3.5.2 bitset operations:
|
|
//@{
|
|
/**
|
|
* Operations on bitsets.
|
|
* @param __rhs A same-sized bitset.
|
|
*
|
|
* These should be self-explanatory.
|
|
*/
|
|
bitset<_Nb>&
|
|
operator&=(const bitset<_Nb>& __rhs) _GLIBCXX_NOEXCEPT
|
|
{
|
|
this->_M_do_and(__rhs);
|
|
return *this;
|
|
}
|
|
|
|
bitset<_Nb>&
|
|
operator|=(const bitset<_Nb>& __rhs) _GLIBCXX_NOEXCEPT
|
|
{
|
|
this->_M_do_or(__rhs);
|
|
return *this;
|
|
}
|
|
|
|
bitset<_Nb>&
|
|
operator^=(const bitset<_Nb>& __rhs) _GLIBCXX_NOEXCEPT
|
|
{
|
|
this->_M_do_xor(__rhs);
|
|
return *this;
|
|
}
|
|
//@}
|
|
|
|
//@{
|
|
/**
|
|
* Operations on bitsets.
|
|
* @param __position The number of places to shift.
|
|
*
|
|
* These should be self-explanatory.
|
|
*/
|
|
bitset<_Nb>&
|
|
operator<<=(size_t __position) _GLIBCXX_NOEXCEPT
|
|
{
|
|
if (__builtin_expect(__position < _Nb, 1))
|
|
{
|
|
this->_M_do_left_shift(__position);
|
|
this->_M_do_sanitize();
|
|
}
|
|
else
|
|
this->_M_do_reset();
|
|
return *this;
|
|
}
|
|
|
|
bitset<_Nb>&
|
|
operator>>=(size_t __position) _GLIBCXX_NOEXCEPT
|
|
{
|
|
if (__builtin_expect(__position < _Nb, 1))
|
|
{
|
|
this->_M_do_right_shift(__position);
|
|
this->_M_do_sanitize();
|
|
}
|
|
else
|
|
this->_M_do_reset();
|
|
return *this;
|
|
}
|
|
//@}
|
|
|
|
//@{
|
|
/**
|
|
* These versions of single-bit set, reset, flip, and test are
|
|
* extensions from the SGI version. They do no range checking.
|
|
* @ingroup SGIextensions
|
|
*/
|
|
bitset<_Nb>&
|
|
_Unchecked_set(size_t __pos) _GLIBCXX_NOEXCEPT
|
|
{
|
|
this->_M_getword(__pos) |= _Base::_S_maskbit(__pos);
|
|
return *this;
|
|
}
|
|
|
|
bitset<_Nb>&
|
|
_Unchecked_set(size_t __pos, int __val) _GLIBCXX_NOEXCEPT
|
|
{
|
|
if (__val)
|
|
this->_M_getword(__pos) |= _Base::_S_maskbit(__pos);
|
|
else
|
|
this->_M_getword(__pos) &= ~_Base::_S_maskbit(__pos);
|
|
return *this;
|
|
}
|
|
|
|
bitset<_Nb>&
|
|
_Unchecked_reset(size_t __pos) _GLIBCXX_NOEXCEPT
|
|
{
|
|
this->_M_getword(__pos) &= ~_Base::_S_maskbit(__pos);
|
|
return *this;
|
|
}
|
|
|
|
bitset<_Nb>&
|
|
_Unchecked_flip(size_t __pos) _GLIBCXX_NOEXCEPT
|
|
{
|
|
this->_M_getword(__pos) ^= _Base::_S_maskbit(__pos);
|
|
return *this;
|
|
}
|
|
|
|
_GLIBCXX_CONSTEXPR bool
|
|
_Unchecked_test(size_t __pos) const _GLIBCXX_NOEXCEPT
|
|
{ return ((this->_M_getword(__pos) & _Base::_S_maskbit(__pos))
|
|
!= static_cast<_WordT>(0)); }
|
|
//@}
|
|
|
|
// Set, reset, and flip.
|
|
/**
|
|
* @brief Sets every bit to true.
|
|
*/
|
|
bitset<_Nb>&
|
|
set() _GLIBCXX_NOEXCEPT
|
|
{
|
|
this->_M_do_set();
|
|
this->_M_do_sanitize();
|
|
return *this;
|
|
}
|
|
|
|
/**
|
|
* @brief Sets a given bit to a particular value.
|
|
* @param __position The index of the bit.
|
|
* @param __val Either true or false, defaults to true.
|
|
* @throw std::out_of_range If @a pos is bigger the size of the %set.
|
|
*/
|
|
bitset<_Nb>&
|
|
set(size_t __position, bool __val = true)
|
|
{
|
|
if (__position >= _Nb)
|
|
__throw_out_of_range(__N("bitset::set"));
|
|
return _Unchecked_set(__position, __val);
|
|
}
|
|
|
|
/**
|
|
* @brief Sets every bit to false.
|
|
*/
|
|
bitset<_Nb>&
|
|
reset() _GLIBCXX_NOEXCEPT
|
|
{
|
|
this->_M_do_reset();
|
|
return *this;
|
|
}
|
|
|
|
/**
|
|
* @brief Sets a given bit to false.
|
|
* @param __position The index of the bit.
|
|
* @throw std::out_of_range If @a pos is bigger the size of the %set.
|
|
*
|
|
* Same as writing @c set(pos,false).
|
|
*/
|
|
bitset<_Nb>&
|
|
reset(size_t __position)
|
|
{
|
|
if (__position >= _Nb)
|
|
__throw_out_of_range(__N("bitset::reset"));
|
|
return _Unchecked_reset(__position);
|
|
}
|
|
|
|
/**
|
|
* @brief Toggles every bit to its opposite value.
|
|
*/
|
|
bitset<_Nb>&
|
|
flip() _GLIBCXX_NOEXCEPT
|
|
{
|
|
this->_M_do_flip();
|
|
this->_M_do_sanitize();
|
|
return *this;
|
|
}
|
|
|
|
/**
|
|
* @brief Toggles a given bit to its opposite value.
|
|
* @param __position The index of the bit.
|
|
* @throw std::out_of_range If @a pos is bigger the size of the %set.
|
|
*/
|
|
bitset<_Nb>&
|
|
flip(size_t __position)
|
|
{
|
|
if (__position >= _Nb)
|
|
__throw_out_of_range(__N("bitset::flip"));
|
|
return _Unchecked_flip(__position);
|
|
}
|
|
|
|
/// See the no-argument flip().
|
|
bitset<_Nb>
|
|
operator~() const _GLIBCXX_NOEXCEPT
|
|
{ return bitset<_Nb>(*this).flip(); }
|
|
|
|
//@{
|
|
/**
|
|
* @brief Array-indexing support.
|
|
* @param __position Index into the %bitset.
|
|
* @return A bool for a <em>const %bitset</em>. For non-const
|
|
* bitsets, an instance of the reference proxy class.
|
|
* @note These operators do no range checking and throw no exceptions,
|
|
* as required by DR 11 to the standard.
|
|
*
|
|
* _GLIBCXX_RESOLVE_LIB_DEFECTS Note that this implementation already
|
|
* resolves DR 11 (items 1 and 2), but does not do the range-checking
|
|
* required by that DR's resolution. -pme
|
|
* The DR has since been changed: range-checking is a precondition
|
|
* (users' responsibility), and these functions must not throw. -pme
|
|
*/
|
|
reference
|
|
operator[](size_t __position)
|
|
{ return reference(*this, __position); }
|
|
|
|
_GLIBCXX_CONSTEXPR bool
|
|
operator[](size_t __position) const
|
|
{ return _Unchecked_test(__position); }
|
|
//@}
|
|
|
|
/**
|
|
* @brief Returns a numerical interpretation of the %bitset.
|
|
* @return The integral equivalent of the bits.
|
|
* @throw std::overflow_error If there are too many bits to be
|
|
* represented in an @c unsigned @c long.
|
|
*/
|
|
unsigned long
|
|
to_ulong() const
|
|
{ return this->_M_do_to_ulong(); }
|
|
|
|
#if __cplusplus >= 201103L
|
|
unsigned long long
|
|
to_ullong() const
|
|
{ return this->_M_do_to_ullong(); }
|
|
#endif
|
|
|
|
/**
|
|
* @brief Returns a character interpretation of the %bitset.
|
|
* @return The string equivalent of the bits.
|
|
*
|
|
* Note the ordering of the bits: decreasing character positions
|
|
* correspond to increasing bit positions (see the main class notes for
|
|
* an example).
|
|
*/
|
|
template<class _CharT, class _Traits, class _Alloc>
|
|
std::basic_string<_CharT, _Traits, _Alloc>
|
|
to_string() const
|
|
{
|
|
std::basic_string<_CharT, _Traits, _Alloc> __result;
|
|
_M_copy_to_string(__result, _CharT('0'), _CharT('1'));
|
|
return __result;
|
|
}
|
|
|
|
// _GLIBCXX_RESOLVE_LIB_DEFECTS
|
|
// 396. what are characters zero and one.
|
|
template<class _CharT, class _Traits, class _Alloc>
|
|
std::basic_string<_CharT, _Traits, _Alloc>
|
|
to_string(_CharT __zero, _CharT __one = _CharT('1')) const
|
|
{
|
|
std::basic_string<_CharT, _Traits, _Alloc> __result;
|
|
_M_copy_to_string(__result, __zero, __one);
|
|
return __result;
|
|
}
|
|
|
|
// _GLIBCXX_RESOLVE_LIB_DEFECTS
|
|
// 434. bitset::to_string() hard to use.
|
|
template<class _CharT, class _Traits>
|
|
std::basic_string<_CharT, _Traits, std::allocator<_CharT> >
|
|
to_string() const
|
|
{ return to_string<_CharT, _Traits, std::allocator<_CharT> >(); }
|
|
|
|
// _GLIBCXX_RESOLVE_LIB_DEFECTS
|
|
// 853. to_string needs updating with zero and one.
|
|
template<class _CharT, class _Traits>
|
|
std::basic_string<_CharT, _Traits, std::allocator<_CharT> >
|
|
to_string(_CharT __zero, _CharT __one = _CharT('1')) const
|
|
{ return to_string<_CharT, _Traits,
|
|
std::allocator<_CharT> >(__zero, __one); }
|
|
|
|
template<class _CharT>
|
|
std::basic_string<_CharT, std::char_traits<_CharT>,
|
|
std::allocator<_CharT> >
|
|
to_string() const
|
|
{
|
|
return to_string<_CharT, std::char_traits<_CharT>,
|
|
std::allocator<_CharT> >();
|
|
}
|
|
|
|
template<class _CharT>
|
|
std::basic_string<_CharT, std::char_traits<_CharT>,
|
|
std::allocator<_CharT> >
|
|
to_string(_CharT __zero, _CharT __one = _CharT('1')) const
|
|
{
|
|
return to_string<_CharT, std::char_traits<_CharT>,
|
|
std::allocator<_CharT> >(__zero, __one);
|
|
}
|
|
|
|
std::basic_string<char, std::char_traits<char>, std::allocator<char> >
|
|
to_string() const
|
|
{
|
|
return to_string<char, std::char_traits<char>,
|
|
std::allocator<char> >();
|
|
}
|
|
|
|
std::basic_string<char, std::char_traits<char>, std::allocator<char> >
|
|
to_string(char __zero, char __one = '1') const
|
|
{
|
|
return to_string<char, std::char_traits<char>,
|
|
std::allocator<char> >(__zero, __one);
|
|
}
|
|
|
|
// Helper functions for string operations.
|
|
template<class _CharT, class _Traits>
|
|
void
|
|
_M_copy_from_ptr(const _CharT*, size_t, size_t, size_t,
|
|
_CharT, _CharT);
|
|
|
|
template<class _CharT, class _Traits, class _Alloc>
|
|
void
|
|
_M_copy_from_string(const std::basic_string<_CharT,
|
|
_Traits, _Alloc>& __s, size_t __pos, size_t __n,
|
|
_CharT __zero, _CharT __one)
|
|
{ _M_copy_from_ptr<_CharT, _Traits>(__s.data(), __s.size(), __pos, __n,
|
|
__zero, __one); }
|
|
|
|
template<class _CharT, class _Traits, class _Alloc>
|
|
void
|
|
_M_copy_to_string(std::basic_string<_CharT, _Traits, _Alloc>&,
|
|
_CharT, _CharT) const;
|
|
|
|
// NB: Backward compat.
|
|
template<class _CharT, class _Traits, class _Alloc>
|
|
void
|
|
_M_copy_from_string(const std::basic_string<_CharT,
|
|
_Traits, _Alloc>& __s, size_t __pos, size_t __n)
|
|
{ _M_copy_from_string(__s, __pos, __n, _CharT('0'), _CharT('1')); }
|
|
|
|
template<class _CharT, class _Traits, class _Alloc>
|
|
void
|
|
_M_copy_to_string(std::basic_string<_CharT, _Traits,_Alloc>& __s) const
|
|
{ _M_copy_to_string(__s, _CharT('0'), _CharT('1')); }
|
|
|
|
/// Returns the number of bits which are set.
|
|
size_t
|
|
count() const _GLIBCXX_NOEXCEPT
|
|
{ return this->_M_do_count(); }
|
|
|
|
/// Returns the total number of bits.
|
|
_GLIBCXX_CONSTEXPR size_t
|
|
size() const _GLIBCXX_NOEXCEPT
|
|
{ return _Nb; }
|
|
|
|
//@{
|
|
/// These comparisons for equality/inequality are, well, @e bitwise.
|
|
bool
|
|
operator==(const bitset<_Nb>& __rhs) const _GLIBCXX_NOEXCEPT
|
|
{ return this->_M_is_equal(__rhs); }
|
|
|
|
bool
|
|
operator!=(const bitset<_Nb>& __rhs) const _GLIBCXX_NOEXCEPT
|
|
{ return !this->_M_is_equal(__rhs); }
|
|
//@}
|
|
|
|
/**
|
|
* @brief Tests the value of a bit.
|
|
* @param __position The index of a bit.
|
|
* @return The value at @a pos.
|
|
* @throw std::out_of_range If @a pos is bigger the size of the %set.
|
|
*/
|
|
bool
|
|
test(size_t __position) const
|
|
{
|
|
if (__position >= _Nb)
|
|
__throw_out_of_range(__N("bitset::test"));
|
|
return _Unchecked_test(__position);
|
|
}
|
|
|
|
// _GLIBCXX_RESOLVE_LIB_DEFECTS
|
|
// DR 693. std::bitset::all() missing.
|
|
/**
|
|
* @brief Tests whether all the bits are on.
|
|
* @return True if all the bits are set.
|
|
*/
|
|
bool
|
|
all() const _GLIBCXX_NOEXCEPT
|
|
{ return this->template _M_are_all<_Nb>(); }
|
|
|
|
/**
|
|
* @brief Tests whether any of the bits are on.
|
|
* @return True if at least one bit is set.
|
|
*/
|
|
bool
|
|
any() const _GLIBCXX_NOEXCEPT
|
|
{ return this->_M_is_any(); }
|
|
|
|
/**
|
|
* @brief Tests whether any of the bits are on.
|
|
* @return True if none of the bits are set.
|
|
*/
|
|
bool
|
|
none() const _GLIBCXX_NOEXCEPT
|
|
{ return !this->_M_is_any(); }
|
|
|
|
//@{
|
|
/// Self-explanatory.
|
|
bitset<_Nb>
|
|
operator<<(size_t __position) const _GLIBCXX_NOEXCEPT
|
|
{ return bitset<_Nb>(*this) <<= __position; }
|
|
|
|
bitset<_Nb>
|
|
operator>>(size_t __position) const _GLIBCXX_NOEXCEPT
|
|
{ return bitset<_Nb>(*this) >>= __position; }
|
|
//@}
|
|
|
|
/**
|
|
* @brief Finds the index of the first "on" bit.
|
|
* @return The index of the first bit set, or size() if not found.
|
|
* @ingroup SGIextensions
|
|
* @sa _Find_next
|
|
*/
|
|
size_t
|
|
_Find_first() const _GLIBCXX_NOEXCEPT
|
|
{ return this->_M_do_find_first(_Nb); }
|
|
|
|
/**
|
|
* @brief Finds the index of the next "on" bit after prev.
|
|
* @return The index of the next bit set, or size() if not found.
|
|
* @param __prev Where to start searching.
|
|
* @ingroup SGIextensions
|
|
* @sa _Find_first
|
|
*/
|
|
size_t
|
|
_Find_next(size_t __prev) const _GLIBCXX_NOEXCEPT
|
|
{ return this->_M_do_find_next(__prev, _Nb); }
|
|
};
|
|
|
|
// Definitions of non-inline member functions.
|
|
template<size_t _Nb>
|
|
template<class _CharT, class _Traits>
|
|
void
|
|
bitset<_Nb>::
|
|
_M_copy_from_ptr(const _CharT* __s, size_t __len,
|
|
size_t __pos, size_t __n, _CharT __zero, _CharT __one)
|
|
{
|
|
reset();
|
|
const size_t __nbits = std::min(_Nb, std::min(__n, size_t(__len - __pos)));
|
|
for (size_t __i = __nbits; __i > 0; --__i)
|
|
{
|
|
const _CharT __c = __s[__pos + __nbits - __i];
|
|
if (_Traits::eq(__c, __zero))
|
|
;
|
|
else if (_Traits::eq(__c, __one))
|
|
_Unchecked_set(__i - 1);
|
|
else
|
|
__throw_invalid_argument(__N("bitset::_M_copy_from_ptr"));
|
|
}
|
|
}
|
|
|
|
template<size_t _Nb>
|
|
template<class _CharT, class _Traits, class _Alloc>
|
|
void
|
|
bitset<_Nb>::
|
|
_M_copy_to_string(std::basic_string<_CharT, _Traits, _Alloc>& __s,
|
|
_CharT __zero, _CharT __one) const
|
|
{
|
|
__s.assign(_Nb, __zero);
|
|
for (size_t __i = _Nb; __i > 0; --__i)
|
|
if (_Unchecked_test(__i - 1))
|
|
_Traits::assign(__s[_Nb - __i], __one);
|
|
}
|
|
|
|
// 23.3.5.3 bitset operations:
|
|
//@{
|
|
/**
|
|
* @brief Global bitwise operations on bitsets.
|
|
* @param __x A bitset.
|
|
* @param __y A bitset of the same size as @a __x.
|
|
* @return A new bitset.
|
|
*
|
|
* These should be self-explanatory.
|
|
*/
|
|
template<size_t _Nb>
|
|
inline bitset<_Nb>
|
|
operator&(const bitset<_Nb>& __x, const bitset<_Nb>& __y) _GLIBCXX_NOEXCEPT
|
|
{
|
|
bitset<_Nb> __result(__x);
|
|
__result &= __y;
|
|
return __result;
|
|
}
|
|
|
|
template<size_t _Nb>
|
|
inline bitset<_Nb>
|
|
operator|(const bitset<_Nb>& __x, const bitset<_Nb>& __y) _GLIBCXX_NOEXCEPT
|
|
{
|
|
bitset<_Nb> __result(__x);
|
|
__result |= __y;
|
|
return __result;
|
|
}
|
|
|
|
template <size_t _Nb>
|
|
inline bitset<_Nb>
|
|
operator^(const bitset<_Nb>& __x, const bitset<_Nb>& __y) _GLIBCXX_NOEXCEPT
|
|
{
|
|
bitset<_Nb> __result(__x);
|
|
__result ^= __y;
|
|
return __result;
|
|
}
|
|
//@}
|
|
|
|
//@{
|
|
/**
|
|
* @brief Global I/O operators for bitsets.
|
|
*
|
|
* Direct I/O between streams and bitsets is supported. Output is
|
|
* straightforward. Input will skip whitespace, only accept @a 0 and @a 1
|
|
* characters, and will only extract as many digits as the %bitset will
|
|
* hold.
|
|
*/
|
|
template<class _CharT, class _Traits, size_t _Nb>
|
|
std::basic_istream<_CharT, _Traits>&
|
|
operator>>(std::basic_istream<_CharT, _Traits>& __is, bitset<_Nb>& __x)
|
|
{
|
|
typedef typename _Traits::char_type char_type;
|
|
typedef std::basic_istream<_CharT, _Traits> __istream_type;
|
|
typedef typename __istream_type::ios_base __ios_base;
|
|
|
|
std::basic_string<_CharT, _Traits> __tmp;
|
|
__tmp.reserve(_Nb);
|
|
|
|
// _GLIBCXX_RESOLVE_LIB_DEFECTS
|
|
// 303. Bitset input operator underspecified
|
|
const char_type __zero = __is.widen('0');
|
|
const char_type __one = __is.widen('1');
|
|
|
|
typename __ios_base::iostate __state = __ios_base::goodbit;
|
|
typename __istream_type::sentry __sentry(__is);
|
|
if (__sentry)
|
|
{
|
|
__try
|
|
{
|
|
for (size_t __i = _Nb; __i > 0; --__i)
|
|
{
|
|
static typename _Traits::int_type __eof = _Traits::eof();
|
|
|
|
typename _Traits::int_type __c1 = __is.rdbuf()->sbumpc();
|
|
if (_Traits::eq_int_type(__c1, __eof))
|
|
{
|
|
__state |= __ios_base::eofbit;
|
|
break;
|
|
}
|
|
else
|
|
{
|
|
const char_type __c2 = _Traits::to_char_type(__c1);
|
|
if (_Traits::eq(__c2, __zero))
|
|
__tmp.push_back(__zero);
|
|
else if (_Traits::eq(__c2, __one))
|
|
__tmp.push_back(__one);
|
|
else if (_Traits::
|
|
eq_int_type(__is.rdbuf()->sputbackc(__c2),
|
|
__eof))
|
|
{
|
|
__state |= __ios_base::failbit;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
__catch(__cxxabiv1::__forced_unwind&)
|
|
{
|
|
__is._M_setstate(__ios_base::badbit);
|
|
__throw_exception_again;
|
|
}
|
|
__catch(...)
|
|
{ __is._M_setstate(__ios_base::badbit); }
|
|
}
|
|
|
|
if (__tmp.empty() && _Nb)
|
|
__state |= __ios_base::failbit;
|
|
else
|
|
__x._M_copy_from_string(__tmp, static_cast<size_t>(0), _Nb,
|
|
__zero, __one);
|
|
if (__state)
|
|
__is.setstate(__state);
|
|
return __is;
|
|
}
|
|
|
|
template <class _CharT, class _Traits, size_t _Nb>
|
|
std::basic_ostream<_CharT, _Traits>&
|
|
operator<<(std::basic_ostream<_CharT, _Traits>& __os,
|
|
const bitset<_Nb>& __x)
|
|
{
|
|
std::basic_string<_CharT, _Traits> __tmp;
|
|
|
|
// _GLIBCXX_RESOLVE_LIB_DEFECTS
|
|
// 396. what are characters zero and one.
|
|
const ctype<_CharT>& __ct = use_facet<ctype<_CharT> >(__os.getloc());
|
|
__x._M_copy_to_string(__tmp, __ct.widen('0'), __ct.widen('1'));
|
|
return __os << __tmp;
|
|
}
|
|
//@}
|
|
|
|
_GLIBCXX_END_NAMESPACE_CONTAINER
|
|
} // namespace std
|
|
|
|
#undef _GLIBCXX_BITSET_WORDS
|
|
#undef _GLIBCXX_BITSET_BITS_PER_WORD
|
|
#undef _GLIBCXX_BITSET_BITS_PER_ULL
|
|
|
|
#if __cplusplus >= 201103L
|
|
|
|
#include <bits/functional_hash.h>
|
|
|
|
namespace std _GLIBCXX_VISIBILITY(default)
|
|
{
|
|
_GLIBCXX_BEGIN_NAMESPACE_VERSION
|
|
|
|
// DR 1182.
|
|
/// std::hash specialization for bitset.
|
|
template<size_t _Nb>
|
|
struct hash<_GLIBCXX_STD_C::bitset<_Nb>>
|
|
: public __hash_base<size_t, _GLIBCXX_STD_C::bitset<_Nb>>
|
|
{
|
|
size_t
|
|
operator()(const _GLIBCXX_STD_C::bitset<_Nb>& __b) const noexcept
|
|
{
|
|
const size_t __clength = (_Nb + __CHAR_BIT__ - 1) / __CHAR_BIT__;
|
|
return std::_Hash_impl::hash(__b._M_getdata(), __clength);
|
|
}
|
|
};
|
|
|
|
template<>
|
|
struct hash<_GLIBCXX_STD_C::bitset<0>>
|
|
: public __hash_base<size_t, _GLIBCXX_STD_C::bitset<0>>
|
|
{
|
|
size_t
|
|
operator()(const _GLIBCXX_STD_C::bitset<0>&) const noexcept
|
|
{ return 0; }
|
|
};
|
|
|
|
_GLIBCXX_END_NAMESPACE_VERSION
|
|
} // namespace
|
|
|
|
#endif // C++11
|
|
|
|
#ifdef _GLIBCXX_DEBUG
|
|
# include <debug/bitset>
|
|
#endif
|
|
|
|
#ifdef _GLIBCXX_PROFILE
|
|
# include <profile/bitset>
|
|
#endif
|
|
|
|
#endif /* _GLIBCXX_BITSET */
|