710 lines
22 KiB
C++
710 lines
22 KiB
C++
// Components for manipulating non-owning sequences of characters -*- C++ -*-
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// Copyright (C) 2013-2022 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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/** @file experimental/string_view
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* This is a TS C++ Library header.
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* @ingroup libfund-ts
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*/
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//
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// N3762 basic_string_view library
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//
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#ifndef _GLIBCXX_EXPERIMENTAL_STRING_VIEW
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#define _GLIBCXX_EXPERIMENTAL_STRING_VIEW 1
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#pragma GCC system_header
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#if __cplusplus >= 201402L
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#include <string>
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#include <limits>
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#include <bits/ranges_base.h> // enable_borrowed_range, enable_view
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#include <experimental/bits/lfts_config.h>
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namespace std _GLIBCXX_VISIBILITY(default)
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{
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_GLIBCXX_BEGIN_NAMESPACE_VERSION
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namespace experimental
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{
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inline namespace fundamentals_v1
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{
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#define __cpp_lib_experimental_string_view 201411
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/**
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* @class basic_string_view <experimental/string_view>
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* @brief A non-owning reference to a string.
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*
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* @ingroup strings
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* @ingroup sequences
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* @ingroup libfund-ts
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*
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* @tparam _CharT Type of character
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* @tparam _Traits Traits for character type, defaults to
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* char_traits<_CharT>.
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*
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* A basic_string_view looks like this:
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*
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* @code
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* _CharT* _M_str
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* size_t _M_len
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* @endcode
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*/
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template<typename _CharT, typename _Traits = std::char_traits<_CharT>>
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class basic_string_view
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{
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public:
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// types
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using traits_type = _Traits;
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using value_type = _CharT;
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using pointer = _CharT*;
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using const_pointer = const _CharT*;
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using reference = _CharT&;
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using const_reference = const _CharT&;
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using const_iterator = const _CharT*;
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using iterator = const_iterator;
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using const_reverse_iterator = std::reverse_iterator<const_iterator>;
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using reverse_iterator = const_reverse_iterator;
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using size_type = size_t;
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using difference_type = ptrdiff_t;
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static constexpr size_type npos = size_type(-1);
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// [string.view.cons], construct/copy
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constexpr
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basic_string_view() noexcept
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: _M_len{0}, _M_str{nullptr}
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{ }
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constexpr basic_string_view(const basic_string_view&) noexcept = default;
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template<typename _Allocator>
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basic_string_view(const basic_string<_CharT, _Traits,
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_Allocator>& __str) noexcept
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: _M_len{__str.length()}, _M_str{__str.data()}
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{ }
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constexpr basic_string_view(const _CharT* __str)
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: _M_len{__str == nullptr ? 0 : traits_type::length(__str)},
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_M_str{__str}
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{ }
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constexpr basic_string_view(const _CharT* __str, size_type __len)
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: _M_len{__len},
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_M_str{__str}
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{ }
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basic_string_view&
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operator=(const basic_string_view&) noexcept = default;
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// [string.view.iterators], iterators
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constexpr const_iterator
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begin() const noexcept
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{ return this->_M_str; }
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constexpr const_iterator
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end() const noexcept
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{ return this->_M_str + this->_M_len; }
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constexpr const_iterator
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cbegin() const noexcept
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{ return this->_M_str; }
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constexpr const_iterator
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cend() const noexcept
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{ return this->_M_str + this->_M_len; }
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const_reverse_iterator
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rbegin() const noexcept
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{ return const_reverse_iterator(this->end()); }
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const_reverse_iterator
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rend() const noexcept
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{ return const_reverse_iterator(this->begin()); }
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const_reverse_iterator
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crbegin() const noexcept
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{ return const_reverse_iterator(this->end()); }
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const_reverse_iterator
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crend() const noexcept
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{ return const_reverse_iterator(this->begin()); }
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// [string.view.capacity], capacity
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constexpr size_type
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size() const noexcept
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{ return this->_M_len; }
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constexpr size_type
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length() const noexcept
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{ return _M_len; }
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constexpr size_type
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max_size() const noexcept
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{
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return (npos - sizeof(size_type) - sizeof(void*))
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/ sizeof(value_type) / 4;
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}
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_GLIBCXX_NODISCARD constexpr bool
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empty() const noexcept
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{ return this->_M_len == 0; }
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// [string.view.access], element access
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constexpr const _CharT&
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operator[](size_type __pos) const
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{
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__glibcxx_assert(__pos < this->_M_len);
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return *(this->_M_str + __pos);
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}
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constexpr const _CharT&
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at(size_type __pos) const
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{
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return __pos < this->_M_len
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? *(this->_M_str + __pos)
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: (__throw_out_of_range_fmt(__N("basic_string_view::at: __pos "
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"(which is %zu) >= this->size() "
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"(which is %zu)"),
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__pos, this->size()),
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*this->_M_str);
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}
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constexpr const _CharT&
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front() const
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{
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__glibcxx_assert(this->_M_len > 0);
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return *this->_M_str;
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}
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constexpr const _CharT&
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back() const
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{
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__glibcxx_assert(this->_M_len > 0);
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return *(this->_M_str + this->_M_len - 1);
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}
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constexpr const _CharT*
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data() const noexcept
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{ return this->_M_str; }
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// [string.view.modifiers], modifiers:
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constexpr void
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remove_prefix(size_type __n)
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{
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__glibcxx_assert(this->_M_len >= __n);
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this->_M_str += __n;
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this->_M_len -= __n;
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}
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constexpr void
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remove_suffix(size_type __n)
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{ this->_M_len -= __n; }
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constexpr void
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swap(basic_string_view& __sv) noexcept
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{
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auto __tmp = *this;
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*this = __sv;
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__sv = __tmp;
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}
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// [string.view.ops], string operations:
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template<typename _Allocator>
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explicit operator basic_string<_CharT, _Traits, _Allocator>() const
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{
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return { this->_M_str, this->_M_len };
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}
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template<typename _Allocator = std::allocator<_CharT>>
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basic_string<_CharT, _Traits, _Allocator>
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to_string(const _Allocator& __alloc = _Allocator()) const
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{
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return { this->_M_str, this->_M_len, __alloc };
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}
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size_type
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copy(_CharT* __str, size_type __n, size_type __pos = 0) const
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{
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__glibcxx_requires_string_len(__str, __n);
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if (__pos > this->_M_len)
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__throw_out_of_range_fmt(__N("basic_string_view::copy: __pos "
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"(which is %zu) > this->size() "
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"(which is %zu)"),
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__pos, this->size());
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size_type __rlen{std::min(__n, size_type{this->_M_len - __pos})};
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for (auto __begin = this->_M_str + __pos,
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__end = __begin + __rlen; __begin != __end;)
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*__str++ = *__begin++;
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return __rlen;
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}
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// [string.view.ops], string operations:
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constexpr basic_string_view
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substr(size_type __pos = 0, size_type __n = npos) const
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{
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return __pos <= this->_M_len
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? basic_string_view{this->_M_str + __pos,
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std::min(__n, size_type{this->_M_len - __pos})}
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: (__throw_out_of_range_fmt(__N("basic_string_view::substr: __pos "
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"(which is %zu) > this->size() "
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"(which is %zu)"),
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__pos, this->size()), basic_string_view{});
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}
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constexpr int
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compare(basic_string_view __str) const noexcept
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{
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int __ret = traits_type::compare(this->_M_str, __str._M_str,
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std::min(this->_M_len, __str._M_len));
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if (__ret == 0)
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__ret = _S_compare(this->_M_len, __str._M_len);
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return __ret;
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}
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constexpr int
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compare(size_type __pos1, size_type __n1, basic_string_view __str) const
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{ return this->substr(__pos1, __n1).compare(__str); }
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constexpr int
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compare(size_type __pos1, size_type __n1,
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basic_string_view __str, size_type __pos2, size_type __n2) const
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{ return this->substr(__pos1, __n1).compare(__str.substr(__pos2, __n2)); }
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constexpr int
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compare(const _CharT* __str) const noexcept
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{ return this->compare(basic_string_view{__str}); }
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constexpr int
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compare(size_type __pos1, size_type __n1, const _CharT* __str) const
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{ return this->substr(__pos1, __n1).compare(basic_string_view{__str}); }
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constexpr int
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compare(size_type __pos1, size_type __n1,
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const _CharT* __str, size_type __n2) const
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{
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return this->substr(__pos1, __n1)
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.compare(basic_string_view(__str, __n2));
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}
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constexpr size_type
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find(basic_string_view __str, size_type __pos = 0) const noexcept
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{ return this->find(__str._M_str, __pos, __str._M_len); }
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constexpr size_type
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find(_CharT __c, size_type __pos=0) const noexcept;
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constexpr size_type
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find(const _CharT* __str, size_type __pos, size_type __n) const noexcept;
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constexpr size_type
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find(const _CharT* __str, size_type __pos=0) const noexcept
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{ return this->find(__str, __pos, traits_type::length(__str)); }
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constexpr size_type
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rfind(basic_string_view __str, size_type __pos = npos) const noexcept
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{ return this->rfind(__str._M_str, __pos, __str._M_len); }
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constexpr size_type
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rfind(_CharT __c, size_type __pos = npos) const noexcept;
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constexpr size_type
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rfind(const _CharT* __str, size_type __pos, size_type __n) const noexcept;
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constexpr size_type
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rfind(const _CharT* __str, size_type __pos = npos) const noexcept
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{ return this->rfind(__str, __pos, traits_type::length(__str)); }
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constexpr size_type
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find_first_of(basic_string_view __str, size_type __pos = 0) const noexcept
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{ return this->find_first_of(__str._M_str, __pos, __str._M_len); }
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constexpr size_type
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find_first_of(_CharT __c, size_type __pos = 0) const noexcept
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{ return this->find(__c, __pos); }
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constexpr size_type
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find_first_of(const _CharT* __str, size_type __pos, size_type __n) const;
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constexpr size_type
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find_first_of(const _CharT* __str, size_type __pos = 0) const noexcept
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{ return this->find_first_of(__str, __pos, traits_type::length(__str)); }
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constexpr size_type
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find_last_of(basic_string_view __str,
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size_type __pos = npos) const noexcept
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{ return this->find_last_of(__str._M_str, __pos, __str._M_len); }
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constexpr size_type
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find_last_of(_CharT __c, size_type __pos=npos) const noexcept
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{ return this->rfind(__c, __pos); }
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constexpr size_type
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find_last_of(const _CharT* __str, size_type __pos, size_type __n) const;
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constexpr size_type
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find_last_of(const _CharT* __str, size_type __pos = npos) const noexcept
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{ return this->find_last_of(__str, __pos, traits_type::length(__str)); }
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constexpr size_type
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find_first_not_of(basic_string_view __str,
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size_type __pos = 0) const noexcept
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{ return this->find_first_not_of(__str._M_str, __pos, __str._M_len); }
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constexpr size_type
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find_first_not_of(_CharT __c, size_type __pos = 0) const noexcept;
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constexpr size_type
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find_first_not_of(const _CharT* __str,
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size_type __pos, size_type __n) const;
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constexpr size_type
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find_first_not_of(const _CharT* __str, size_type __pos = 0) const noexcept
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{
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return this->find_first_not_of(__str, __pos,
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traits_type::length(__str));
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}
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constexpr size_type
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find_last_not_of(basic_string_view __str,
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size_type __pos = npos) const noexcept
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{ return this->find_last_not_of(__str._M_str, __pos, __str._M_len); }
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constexpr size_type
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find_last_not_of(_CharT __c, size_type __pos = npos) const noexcept;
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constexpr size_type
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find_last_not_of(const _CharT* __str,
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size_type __pos, size_type __n) const;
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constexpr size_type
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find_last_not_of(const _CharT* __str,
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size_type __pos = npos) const noexcept
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{
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return this->find_last_not_of(__str, __pos,
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traits_type::length(__str));
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}
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private:
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static constexpr int
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_S_compare(size_type __n1, size_type __n2) noexcept
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{
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return difference_type(__n1 - __n2) > std::numeric_limits<int>::max()
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? std::numeric_limits<int>::max()
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: difference_type(__n1 - __n2) < std::numeric_limits<int>::min()
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? std::numeric_limits<int>::min()
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: static_cast<int>(difference_type(__n1 - __n2));
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}
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size_t _M_len;
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const _CharT* _M_str;
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};
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// [string.view.comparison], non-member basic_string_view comparison functions
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// Several of these functions use type_identity_t to create a non-deduced
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// context, so that only one argument participates in template argument
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// deduction and the other argument gets implicitly converted to the deduced
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// type (see N3766).
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template<typename _CharT, typename _Traits>
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constexpr bool
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operator==(basic_string_view<_CharT, _Traits> __x,
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basic_string_view<_CharT, _Traits> __y) noexcept
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{ return __x.size() == __y.size() && __x.compare(__y) == 0; }
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template<typename _CharT, typename _Traits>
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constexpr bool
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operator==(basic_string_view<_CharT, _Traits> __x,
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__type_identity_t<basic_string_view<_CharT, _Traits>> __y)
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noexcept
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{ return __x.size() == __y.size() && __x.compare(__y) == 0; }
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template<typename _CharT, typename _Traits>
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constexpr bool
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operator==(__type_identity_t<basic_string_view<_CharT, _Traits>> __x,
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basic_string_view<_CharT, _Traits> __y) noexcept
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{ return __x.size() == __y.size() && __x.compare(__y) == 0; }
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template<typename _CharT, typename _Traits>
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constexpr bool
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operator!=(basic_string_view<_CharT, _Traits> __x,
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basic_string_view<_CharT, _Traits> __y) noexcept
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{ return !(__x == __y); }
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template<typename _CharT, typename _Traits>
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constexpr bool
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operator!=(basic_string_view<_CharT, _Traits> __x,
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__type_identity_t<basic_string_view<_CharT, _Traits>> __y)
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noexcept
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{ return !(__x == __y); }
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template<typename _CharT, typename _Traits>
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constexpr bool
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operator!=(__type_identity_t<basic_string_view<_CharT, _Traits>> __x,
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basic_string_view<_CharT, _Traits> __y) noexcept
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{ return !(__x == __y); }
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template<typename _CharT, typename _Traits>
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constexpr bool
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operator< (basic_string_view<_CharT, _Traits> __x,
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basic_string_view<_CharT, _Traits> __y) noexcept
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{ return __x.compare(__y) < 0; }
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template<typename _CharT, typename _Traits>
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constexpr bool
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operator< (basic_string_view<_CharT, _Traits> __x,
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__type_identity_t<basic_string_view<_CharT, _Traits>> __y)
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noexcept
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{ return __x.compare(__y) < 0; }
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template<typename _CharT, typename _Traits>
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constexpr bool
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operator< (__type_identity_t<basic_string_view<_CharT, _Traits>> __x,
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basic_string_view<_CharT, _Traits> __y) noexcept
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{ return __x.compare(__y) < 0; }
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template<typename _CharT, typename _Traits>
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constexpr bool
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operator> (basic_string_view<_CharT, _Traits> __x,
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|
basic_string_view<_CharT, _Traits> __y) noexcept
|
|
{ return __x.compare(__y) > 0; }
|
|
|
|
template<typename _CharT, typename _Traits>
|
|
constexpr bool
|
|
operator> (basic_string_view<_CharT, _Traits> __x,
|
|
__type_identity_t<basic_string_view<_CharT, _Traits>> __y)
|
|
noexcept
|
|
{ return __x.compare(__y) > 0; }
|
|
|
|
template<typename _CharT, typename _Traits>
|
|
constexpr bool
|
|
operator> (__type_identity_t<basic_string_view<_CharT, _Traits>> __x,
|
|
basic_string_view<_CharT, _Traits> __y) noexcept
|
|
{ return __x.compare(__y) > 0; }
|
|
|
|
template<typename _CharT, typename _Traits>
|
|
constexpr bool
|
|
operator<=(basic_string_view<_CharT, _Traits> __x,
|
|
basic_string_view<_CharT, _Traits> __y) noexcept
|
|
{ return __x.compare(__y) <= 0; }
|
|
|
|
template<typename _CharT, typename _Traits>
|
|
constexpr bool
|
|
operator<=(basic_string_view<_CharT, _Traits> __x,
|
|
__type_identity_t<basic_string_view<_CharT, _Traits>> __y)
|
|
noexcept
|
|
{ return __x.compare(__y) <= 0; }
|
|
|
|
template<typename _CharT, typename _Traits>
|
|
constexpr bool
|
|
operator<=(__type_identity_t<basic_string_view<_CharT, _Traits>> __x,
|
|
basic_string_view<_CharT, _Traits> __y) noexcept
|
|
{ return __x.compare(__y) <= 0; }
|
|
|
|
template<typename _CharT, typename _Traits>
|
|
constexpr bool
|
|
operator>=(basic_string_view<_CharT, _Traits> __x,
|
|
basic_string_view<_CharT, _Traits> __y) noexcept
|
|
{ return __x.compare(__y) >= 0; }
|
|
|
|
template<typename _CharT, typename _Traits>
|
|
constexpr bool
|
|
operator>=(basic_string_view<_CharT, _Traits> __x,
|
|
__type_identity_t<basic_string_view<_CharT, _Traits>> __y)
|
|
noexcept
|
|
{ return __x.compare(__y) >= 0; }
|
|
|
|
template<typename _CharT, typename _Traits>
|
|
constexpr bool
|
|
operator>=(__type_identity_t<basic_string_view<_CharT, _Traits>> __x,
|
|
basic_string_view<_CharT, _Traits> __y) noexcept
|
|
{ return __x.compare(__y) >= 0; }
|
|
|
|
// [string.view.io], Inserters and extractors
|
|
template<typename _CharT, typename _Traits>
|
|
inline basic_ostream<_CharT, _Traits>&
|
|
operator<<(basic_ostream<_CharT, _Traits>& __os,
|
|
basic_string_view<_CharT,_Traits> __str)
|
|
{ return __ostream_insert(__os, __str.data(), __str.size()); }
|
|
|
|
|
|
// basic_string_view typedef names
|
|
|
|
using string_view = basic_string_view<char>;
|
|
using wstring_view = basic_string_view<wchar_t>;
|
|
#ifdef _GLIBCXX_USE_CHAR8_T
|
|
using u8string_view = basic_string_view<char8_t>;
|
|
#endif
|
|
using u16string_view = basic_string_view<char16_t>;
|
|
using u32string_view = basic_string_view<char32_t>;
|
|
} // namespace fundamentals_v1
|
|
} // namespace experimental
|
|
|
|
|
|
// [string.view.hash], hash support:
|
|
template<typename _Tp>
|
|
struct hash;
|
|
|
|
template<>
|
|
struct hash<experimental::string_view>
|
|
: public __hash_base<size_t, experimental::string_view>
|
|
{
|
|
size_t
|
|
operator()(const experimental::string_view& __str) const noexcept
|
|
{ return std::_Hash_impl::hash(__str.data(), __str.length()); }
|
|
};
|
|
|
|
template<>
|
|
struct __is_fast_hash<hash<experimental::string_view>> : std::false_type
|
|
{ };
|
|
|
|
template<>
|
|
struct hash<experimental::wstring_view>
|
|
: public __hash_base<size_t, wstring>
|
|
{
|
|
size_t
|
|
operator()(const experimental::wstring_view& __s) const noexcept
|
|
{ return std::_Hash_impl::hash(__s.data(),
|
|
__s.length() * sizeof(wchar_t)); }
|
|
};
|
|
|
|
template<>
|
|
struct __is_fast_hash<hash<experimental::wstring_view>> : std::false_type
|
|
{ };
|
|
|
|
#ifdef _GLIBCXX_USE_CHAR8_T
|
|
template<>
|
|
struct hash<experimental::u8string_view>
|
|
: public __hash_base<size_t, experimental::u8string_view>
|
|
{
|
|
size_t
|
|
operator()(const experimental::u8string_view& __s) const noexcept
|
|
{ return std::_Hash_impl::hash(__s.data(), __s.length()); }
|
|
};
|
|
|
|
template<>
|
|
struct __is_fast_hash<hash<experimental::u8string_view>> : std::false_type
|
|
{ };
|
|
#endif
|
|
|
|
template<>
|
|
struct hash<experimental::u16string_view>
|
|
: public __hash_base<size_t, experimental::u16string_view>
|
|
{
|
|
size_t
|
|
operator()(const experimental::u16string_view& __s) const noexcept
|
|
{ return std::_Hash_impl::hash(__s.data(),
|
|
__s.length() * sizeof(char16_t)); }
|
|
};
|
|
|
|
template<>
|
|
struct __is_fast_hash<hash<experimental::u16string_view>> : std::false_type
|
|
{ };
|
|
|
|
template<>
|
|
struct hash<experimental::u32string_view>
|
|
: public __hash_base<size_t, experimental::u32string_view>
|
|
{
|
|
size_t
|
|
operator()(const experimental::u32string_view& __s) const noexcept
|
|
{ return std::_Hash_impl::hash(__s.data(),
|
|
__s.length() * sizeof(char32_t)); }
|
|
};
|
|
|
|
template<>
|
|
struct __is_fast_hash<hash<experimental::u32string_view>> : std::false_type
|
|
{ };
|
|
|
|
namespace experimental
|
|
{
|
|
// I added these EMSR.
|
|
inline namespace literals
|
|
{
|
|
inline namespace string_view_literals
|
|
{
|
|
#pragma GCC diagnostic push
|
|
#pragma GCC diagnostic ignored "-Wliteral-suffix"
|
|
inline constexpr basic_string_view<char>
|
|
operator""sv(const char* __str, size_t __len) noexcept
|
|
{ return basic_string_view<char>{__str, __len}; }
|
|
|
|
inline constexpr basic_string_view<wchar_t>
|
|
operator""sv(const wchar_t* __str, size_t __len) noexcept
|
|
{ return basic_string_view<wchar_t>{__str, __len}; }
|
|
|
|
#ifdef _GLIBCXX_USE_CHAR8_T
|
|
inline constexpr basic_string_view<char8_t>
|
|
operator""sv(const char8_t* __str, size_t __len) noexcept
|
|
{ return basic_string_view<char8_t>{__str, __len}; }
|
|
#endif
|
|
|
|
inline constexpr basic_string_view<char16_t>
|
|
operator""sv(const char16_t* __str, size_t __len) noexcept
|
|
{ return basic_string_view<char16_t>{__str, __len}; }
|
|
|
|
inline constexpr basic_string_view<char32_t>
|
|
operator""sv(const char32_t* __str, size_t __len) noexcept
|
|
{ return basic_string_view<char32_t>{__str, __len}; }
|
|
#pragma GCC diagnostic pop
|
|
} // namespace string_literals
|
|
} // namespace literals
|
|
} // namespace experimental
|
|
|
|
#if __cpp_lib_concepts
|
|
namespace ranges
|
|
{
|
|
// Opt-in to borrowed_range concept
|
|
template<typename _CharT, typename _Traits>
|
|
inline constexpr bool
|
|
enable_borrowed_range<experimental::basic_string_view<_CharT, _Traits>>
|
|
= true;
|
|
|
|
// Opt-in to view concept
|
|
template<typename _CharT, typename _Traits>
|
|
inline constexpr bool
|
|
enable_view<experimental::basic_string_view<_CharT, _Traits>> = true;
|
|
}
|
|
#endif
|
|
|
|
_GLIBCXX_END_NAMESPACE_VERSION
|
|
} // namespace std
|
|
|
|
#include <experimental/bits/string_view.tcc>
|
|
|
|
#endif // __cplusplus <= 201103L
|
|
|
|
#endif // _GLIBCXX_EXPERIMENTAL_STRING_VIEW
|