602 lines
20 KiB
C++
602 lines
20 KiB
C++
// Custom pointer adapter and sample storage policies
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// Copyright (C) 2008-2019 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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* @file ext/pointer.h
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* This file is a GNU extension to the Standard C++ Library.
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*
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* @author Bob Walters
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*
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* Provides reusable _Pointer_adapter for assisting in the development of
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* custom pointer types that can be used with the standard containers via
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* the allocator::pointer and allocator::const_pointer typedefs.
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*/
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#ifndef _POINTER_H
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#define _POINTER_H 1
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#pragma GCC system_header
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#include <iosfwd>
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#include <bits/stl_iterator_base_types.h>
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#include <ext/cast.h>
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#include <ext/type_traits.h>
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#if __cplusplus >= 201103L
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# include <bits/move.h>
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# include <bits/ptr_traits.h>
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#endif
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namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
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{
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_GLIBCXX_BEGIN_NAMESPACE_VERSION
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/**
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* @brief A storage policy for use with _Pointer_adapter<> which yields a
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* standard pointer.
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*
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* A _Storage_policy is required to provide 4 things:
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* 1) A get() API for returning the stored pointer value.
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* 2) An set() API for storing a pointer value.
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* 3) An element_type typedef to define the type this points to.
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* 4) An operator<() to support pointer comparison.
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* 5) An operator==() to support pointer comparison.
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*/
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template<typename _Tp>
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class _Std_pointer_impl
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{
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public:
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// the type this pointer points to.
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typedef _Tp element_type;
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// A method to fetch the pointer value as a standard T* value;
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inline _Tp*
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get() const
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{ return _M_value; }
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// A method to set the pointer value, from a standard T* value;
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inline void
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set(element_type* __arg)
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{ _M_value = __arg; }
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// Comparison of pointers
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inline bool
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operator<(const _Std_pointer_impl& __rarg) const
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{ return (_M_value < __rarg._M_value); }
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inline bool
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operator==(const _Std_pointer_impl& __rarg) const
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{ return (_M_value == __rarg._M_value); }
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private:
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element_type* _M_value;
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};
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/**
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* @brief A storage policy for use with _Pointer_adapter<> which stores
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* the pointer's address as an offset value which is relative to
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* its own address.
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*
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* This is intended for pointers within shared memory regions which
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* might be mapped at different addresses by different processes.
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* For null pointers, a value of 1 is used. (0 is legitimate
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* sometimes for nodes in circularly linked lists) This value was
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* chosen as the least likely to generate an incorrect null, As
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* there is no reason why any normal pointer would point 1 byte into
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* its own pointer address.
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*/
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template<typename _Tp>
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class _Relative_pointer_impl
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{
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public:
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typedef _Tp element_type;
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_Tp*
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get() const
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{
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if (_M_diff == 1)
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return 0;
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else
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return reinterpret_cast<_Tp*>(reinterpret_cast<_UIntPtrType>(this)
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+ _M_diff);
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}
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void
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set(_Tp* __arg)
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{
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if (!__arg)
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_M_diff = 1;
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else
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_M_diff = reinterpret_cast<_UIntPtrType>(__arg)
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- reinterpret_cast<_UIntPtrType>(this);
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}
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// Comparison of pointers
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inline bool
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operator<(const _Relative_pointer_impl& __rarg) const
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{ return (reinterpret_cast<_UIntPtrType>(this->get())
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< reinterpret_cast<_UIntPtrType>(__rarg.get())); }
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inline bool
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operator==(const _Relative_pointer_impl& __rarg) const
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{ return (reinterpret_cast<_UIntPtrType>(this->get())
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== reinterpret_cast<_UIntPtrType>(__rarg.get())); }
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private:
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#ifdef _GLIBCXX_USE_LONG_LONG
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typedef __gnu_cxx::__conditional_type<
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(sizeof(unsigned long) >= sizeof(void*)),
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unsigned long, unsigned long long>::__type _UIntPtrType;
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#else
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typedef unsigned long _UIntPtrType;
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#endif
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_UIntPtrType _M_diff;
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};
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/**
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* Relative_pointer_impl needs a specialization for const T because of
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* the casting done during pointer arithmetic.
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*/
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template<typename _Tp>
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class _Relative_pointer_impl<const _Tp>
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{
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public:
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typedef const _Tp element_type;
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const _Tp*
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get() const
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{
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if (_M_diff == 1)
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return 0;
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else
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return reinterpret_cast<const _Tp*>
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(reinterpret_cast<_UIntPtrType>(this) + _M_diff);
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}
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void
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set(const _Tp* __arg)
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{
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if (!__arg)
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_M_diff = 1;
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else
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_M_diff = reinterpret_cast<_UIntPtrType>(__arg)
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- reinterpret_cast<_UIntPtrType>(this);
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}
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// Comparison of pointers
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inline bool
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operator<(const _Relative_pointer_impl& __rarg) const
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{ return (reinterpret_cast<_UIntPtrType>(this->get())
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< reinterpret_cast<_UIntPtrType>(__rarg.get())); }
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inline bool
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operator==(const _Relative_pointer_impl& __rarg) const
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{ return (reinterpret_cast<_UIntPtrType>(this->get())
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== reinterpret_cast<_UIntPtrType>(__rarg.get())); }
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private:
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#ifdef _GLIBCXX_USE_LONG_LONG
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typedef __gnu_cxx::__conditional_type<
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(sizeof(unsigned long) >= sizeof(void*)),
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unsigned long, unsigned long long>::__type _UIntPtrType;
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#else
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typedef unsigned long _UIntPtrType;
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#endif
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_UIntPtrType _M_diff;
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};
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/**
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* The specialization on this type helps resolve the problem of
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* reference to void, and eliminates the need to specialize
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* _Pointer_adapter for cases of void*, const void*, and so on.
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*/
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struct _Invalid_type { };
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template<typename _Tp>
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struct _Reference_type
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{ typedef _Tp& reference; };
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template<>
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struct _Reference_type<void>
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{ typedef _Invalid_type& reference; };
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template<>
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struct _Reference_type<const void>
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{ typedef const _Invalid_type& reference; };
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template<>
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struct _Reference_type<volatile void>
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{ typedef volatile _Invalid_type& reference; };
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template<>
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struct _Reference_type<volatile const void>
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{ typedef const volatile _Invalid_type& reference; };
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/**
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* This structure accommodates the way in which
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* std::iterator_traits<> is normally specialized for const T*, so
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* that value_type is still T.
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*/
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template<typename _Tp>
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struct _Unqualified_type
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{ typedef _Tp type; };
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template<typename _Tp>
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struct _Unqualified_type<const _Tp>
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{ typedef _Tp type; };
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/**
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* The following provides an 'alternative pointer' that works with
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* the containers when specified as the pointer typedef of the
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* allocator.
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*
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* The pointer type used with the containers doesn't have to be this
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* class, but it must support the implicit conversions, pointer
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* arithmetic, comparison operators, etc. that are supported by this
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* class, and avoid raising compile-time ambiguities. Because
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* creating a working pointer can be challenging, this pointer
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* template was designed to wrapper an easier storage policy type,
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* so that it becomes reusable for creating other pointer types.
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*
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* A key point of this class is also that it allows container
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* writers to 'assume' Allocator::pointer is a typedef for a normal
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* pointer. This class supports most of the conventions of a true
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* pointer, and can, for instance handle implicit conversion to
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* const and base class pointer types. The only impositions on
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* container writers to support extended pointers are: 1) use the
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* Allocator::pointer typedef appropriately for pointer types. 2)
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* if you need pointer casting, use the __pointer_cast<> functions
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* from ext/cast.h. This allows pointer cast operations to be
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* overloaded as necessary by custom pointers.
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*
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* Note: The const qualifier works with this pointer adapter as
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* follows:
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*
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* _Tp* == _Pointer_adapter<_Std_pointer_impl<_Tp> >;
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* const _Tp* == _Pointer_adapter<_Std_pointer_impl<const _Tp> >;
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* _Tp* const == const _Pointer_adapter<_Std_pointer_impl<_Tp> >;
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* const _Tp* const == const _Pointer_adapter<_Std_pointer_impl<const _Tp> >;
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*/
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template<typename _Storage_policy>
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class _Pointer_adapter : public _Storage_policy
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{
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public:
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typedef typename _Storage_policy::element_type element_type;
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// These are needed for iterator_traits
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typedef std::random_access_iterator_tag iterator_category;
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typedef typename _Unqualified_type<element_type>::type value_type;
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typedef std::ptrdiff_t difference_type;
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typedef _Pointer_adapter pointer;
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typedef typename _Reference_type<element_type>::reference reference;
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// Reminder: 'const' methods mean that the method is valid when the
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// pointer is immutable, and has nothing to do with whether the
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// 'pointee' is const.
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// Default Constructor (Convert from element_type*)
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_Pointer_adapter(element_type* __arg = 0)
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{ _Storage_policy::set(__arg); }
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// Copy constructor from _Pointer_adapter of same type.
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_Pointer_adapter(const _Pointer_adapter& __arg)
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{ _Storage_policy::set(__arg.get()); }
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// Convert from _Up* if conversion to element_type* is valid.
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template<typename _Up>
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_Pointer_adapter(_Up* __arg)
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{ _Storage_policy::set(__arg); }
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// Conversion from another _Pointer_adapter if _Up if static cast is
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// valid.
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template<typename _Up>
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_Pointer_adapter(const _Pointer_adapter<_Up>& __arg)
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{ _Storage_policy::set(__arg.get()); }
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// Destructor
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~_Pointer_adapter() { }
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// Assignment operator
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_Pointer_adapter&
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operator=(const _Pointer_adapter& __arg)
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{
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_Storage_policy::set(__arg.get());
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return *this;
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}
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template<typename _Up>
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_Pointer_adapter&
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operator=(const _Pointer_adapter<_Up>& __arg)
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{
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_Storage_policy::set(__arg.get());
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return *this;
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}
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template<typename _Up>
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_Pointer_adapter&
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operator=(_Up* __arg)
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{
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_Storage_policy::set(__arg);
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return *this;
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}
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// Operator*, returns element_type&
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inline reference
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operator*() const
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{ return *(_Storage_policy::get()); }
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// Operator->, returns element_type*
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inline element_type*
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operator->() const
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{ return _Storage_policy::get(); }
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// Operator[], returns a element_type& to the item at that loc.
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inline reference
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operator[](std::ptrdiff_t __index) const
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{ return _Storage_policy::get()[__index]; }
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// To allow implicit conversion to "bool", for "if (ptr)..."
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#if __cplusplus >= 201103L
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explicit operator bool() const { return _Storage_policy::get() != 0; }
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#else
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private:
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typedef element_type*(_Pointer_adapter::*__unspecified_bool_type)() const;
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public:
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operator __unspecified_bool_type() const
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{
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return _Storage_policy::get() == 0 ? 0 :
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&_Pointer_adapter::operator->;
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}
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// ! operator (for: if (!ptr)...)
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inline bool
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operator!() const
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{ return (_Storage_policy::get() == 0); }
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#endif
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// Pointer differences
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inline friend std::ptrdiff_t
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operator-(const _Pointer_adapter& __lhs, element_type* __rhs)
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{ return (__lhs.get() - __rhs); }
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inline friend std::ptrdiff_t
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operator-(element_type* __lhs, const _Pointer_adapter& __rhs)
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{ return (__lhs - __rhs.get()); }
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template<typename _Up>
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inline friend std::ptrdiff_t
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operator-(const _Pointer_adapter& __lhs, _Up* __rhs)
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{ return (__lhs.get() - __rhs); }
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template<typename _Up>
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inline friend std::ptrdiff_t
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operator-(_Up* __lhs, const _Pointer_adapter& __rhs)
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{ return (__lhs - __rhs.get()); }
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template<typename _Up>
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inline std::ptrdiff_t
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operator-(const _Pointer_adapter<_Up>& __rhs) const
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{ return (_Storage_policy::get() - __rhs.get()); }
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// Pointer math
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// Note: There is a reason for all this overloading based on different
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// integer types. In some libstdc++-v3 test cases, a templated
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// operator+ is declared which can match any types. This operator
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// tends to "steal" the recognition of _Pointer_adapter's own operator+
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// unless the integer type matches perfectly.
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#define _CXX_POINTER_ARITH_OPERATOR_SET(INT_TYPE) \
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inline friend _Pointer_adapter \
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operator+(const _Pointer_adapter& __lhs, INT_TYPE __offset) \
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{ return _Pointer_adapter(__lhs.get() + __offset); } \
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\
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inline friend _Pointer_adapter \
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operator+(INT_TYPE __offset, const _Pointer_adapter& __rhs) \
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{ return _Pointer_adapter(__rhs.get() + __offset); } \
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\
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inline friend _Pointer_adapter \
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operator-(const _Pointer_adapter& __lhs, INT_TYPE __offset) \
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{ return _Pointer_adapter(__lhs.get() - __offset); } \
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\
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inline _Pointer_adapter& \
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operator+=(INT_TYPE __offset) \
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{ \
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_Storage_policy::set(_Storage_policy::get() + __offset); \
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return *this; \
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} \
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\
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inline _Pointer_adapter& \
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operator-=(INT_TYPE __offset) \
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{ \
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_Storage_policy::set(_Storage_policy::get() - __offset); \
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return *this; \
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} \
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// END of _CXX_POINTER_ARITH_OPERATOR_SET macro
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// Expand into the various pointer arithmetic operators needed.
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_CXX_POINTER_ARITH_OPERATOR_SET(short);
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_CXX_POINTER_ARITH_OPERATOR_SET(unsigned short);
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_CXX_POINTER_ARITH_OPERATOR_SET(int);
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_CXX_POINTER_ARITH_OPERATOR_SET(unsigned int);
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_CXX_POINTER_ARITH_OPERATOR_SET(long);
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_CXX_POINTER_ARITH_OPERATOR_SET(unsigned long);
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#ifdef _GLIBCXX_USE_LONG_LONG
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_CXX_POINTER_ARITH_OPERATOR_SET(long long);
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_CXX_POINTER_ARITH_OPERATOR_SET(unsigned long long);
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#endif
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// Mathematical Manipulators
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inline _Pointer_adapter&
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operator++()
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{
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_Storage_policy::set(_Storage_policy::get() + 1);
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return *this;
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}
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inline _Pointer_adapter
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operator++(int)
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{
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_Pointer_adapter __tmp(*this);
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_Storage_policy::set(_Storage_policy::get() + 1);
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return __tmp;
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}
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inline _Pointer_adapter&
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operator--()
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{
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_Storage_policy::set(_Storage_policy::get() - 1);
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return *this;
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}
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inline _Pointer_adapter
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operator--(int)
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{
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_Pointer_adapter __tmp(*this);
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_Storage_policy::set(_Storage_policy::get() - 1);
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return __tmp;
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}
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}; // class _Pointer_adapter
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#define _GCC_CXX_POINTER_COMPARISON_OPERATION_SET(OPERATOR) \
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template<typename _Tp1, typename _Tp2> \
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inline bool \
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operator OPERATOR(const _Pointer_adapter<_Tp1>& __lhs, _Tp2 __rhs) \
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{ return __lhs.get() OPERATOR __rhs; } \
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\
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template<typename _Tp1, typename _Tp2> \
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inline bool \
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operator OPERATOR(_Tp1 __lhs, const _Pointer_adapter<_Tp2>& __rhs) \
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{ return __lhs OPERATOR __rhs.get(); } \
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\
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template<typename _Tp1, typename _Tp2> \
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inline bool \
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operator OPERATOR(const _Pointer_adapter<_Tp1>& __lhs, \
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const _Pointer_adapter<_Tp2>& __rhs) \
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{ return __lhs.get() OPERATOR __rhs.get(); } \
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\
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// End GCC_CXX_POINTER_COMPARISON_OPERATION_SET Macro
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// Expand into the various comparison operators needed.
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_GCC_CXX_POINTER_COMPARISON_OPERATION_SET(==)
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_GCC_CXX_POINTER_COMPARISON_OPERATION_SET(!=)
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_GCC_CXX_POINTER_COMPARISON_OPERATION_SET(<)
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_GCC_CXX_POINTER_COMPARISON_OPERATION_SET(<=)
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_GCC_CXX_POINTER_COMPARISON_OPERATION_SET(>)
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_GCC_CXX_POINTER_COMPARISON_OPERATION_SET(>=)
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// These are here for expressions like "ptr == 0", "ptr != 0"
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template<typename _Tp>
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inline bool
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operator==(const _Pointer_adapter<_Tp>& __lhs, int __rhs)
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{ return __lhs.get() == reinterpret_cast<void*>(__rhs); }
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template<typename _Tp>
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inline bool
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operator==(int __lhs, const _Pointer_adapter<_Tp>& __rhs)
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{ return __rhs.get() == reinterpret_cast<void*>(__lhs); }
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template<typename _Tp>
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inline bool
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operator!=(const _Pointer_adapter<_Tp>& __lhs, int __rhs)
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|
{ return __lhs.get() != reinterpret_cast<void*>(__rhs); }
|
|
|
|
template<typename _Tp>
|
|
inline bool
|
|
operator!=(int __lhs, const _Pointer_adapter<_Tp>& __rhs)
|
|
{ return __rhs.get() != reinterpret_cast<void*>(__lhs); }
|
|
|
|
/**
|
|
* Comparison operators for _Pointer_adapter defer to the base class'
|
|
* comparison operators, when possible.
|
|
*/
|
|
template<typename _Tp>
|
|
inline bool
|
|
operator==(const _Pointer_adapter<_Tp>& __lhs,
|
|
const _Pointer_adapter<_Tp>& __rhs)
|
|
{ return __lhs._Tp::operator==(__rhs); }
|
|
|
|
template<typename _Tp>
|
|
inline bool
|
|
operator<=(const _Pointer_adapter<_Tp>& __lhs,
|
|
const _Pointer_adapter<_Tp>& __rhs)
|
|
{ return __lhs._Tp::operator<(__rhs) || __lhs._Tp::operator==(__rhs); }
|
|
|
|
template<typename _Tp>
|
|
inline bool
|
|
operator!=(const _Pointer_adapter<_Tp>& __lhs,
|
|
const _Pointer_adapter<_Tp>& __rhs)
|
|
{ return !(__lhs._Tp::operator==(__rhs)); }
|
|
|
|
template<typename _Tp>
|
|
inline bool
|
|
operator>(const _Pointer_adapter<_Tp>& __lhs,
|
|
const _Pointer_adapter<_Tp>& __rhs)
|
|
{ return !(__lhs._Tp::operator<(__rhs) || __lhs._Tp::operator==(__rhs)); }
|
|
|
|
template<typename _Tp>
|
|
inline bool
|
|
operator>=(const _Pointer_adapter<_Tp>& __lhs,
|
|
const _Pointer_adapter<_Tp>& __rhs)
|
|
{ return !(__lhs._Tp::operator<(__rhs)); }
|
|
|
|
template<typename _CharT, typename _Traits, typename _StoreT>
|
|
inline std::basic_ostream<_CharT, _Traits>&
|
|
operator<<(std::basic_ostream<_CharT, _Traits>& __os,
|
|
const _Pointer_adapter<_StoreT>& __p)
|
|
{ return (__os << __p.get()); }
|
|
|
|
_GLIBCXX_END_NAMESPACE_VERSION
|
|
} // namespace
|
|
|
|
#if __cplusplus >= 201103L
|
|
namespace std _GLIBCXX_VISIBILITY(default)
|
|
{
|
|
_GLIBCXX_BEGIN_NAMESPACE_VERSION
|
|
|
|
template<typename _Storage_policy>
|
|
struct pointer_traits<__gnu_cxx::_Pointer_adapter<_Storage_policy>>
|
|
{
|
|
/// The pointer type
|
|
typedef __gnu_cxx::_Pointer_adapter<_Storage_policy> pointer;
|
|
/// The type pointed to
|
|
typedef typename pointer::element_type element_type;
|
|
/// Type used to represent the difference between two pointers
|
|
typedef typename pointer::difference_type difference_type;
|
|
|
|
template<typename _Up>
|
|
using rebind = typename __gnu_cxx::_Pointer_adapter<
|
|
typename pointer_traits<_Storage_policy>::template rebind<_Up>>;
|
|
|
|
static pointer pointer_to(typename pointer::reference __r) noexcept
|
|
{ return pointer(std::addressof(__r)); }
|
|
};
|
|
|
|
_GLIBCXX_END_NAMESPACE_VERSION
|
|
} // namespace
|
|
#endif
|
|
|
|
#endif // _POINTER_H
|