mirror of
https://github.com/autc04/Retro68.git
synced 2024-09-07 13:54:33 +00:00
191 lines
5.3 KiB
C++
191 lines
5.3 KiB
C++
// Allocator that wraps "C" malloc -*- C++ -*-
|
|
|
|
// Copyright (C) 2001-2019 Free Software Foundation, Inc.
|
|
//
|
|
// This file is part of the GNU ISO C++ Library. This library is free
|
|
// software; you can redistribute it and/or modify it under the
|
|
// terms of the GNU General Public License as published by the
|
|
// Free Software Foundation; either version 3, or (at your option)
|
|
// any later version.
|
|
|
|
// This library is distributed in the hope that it will be useful,
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
// GNU General Public License for more details.
|
|
|
|
// Under Section 7 of GPL version 3, you are granted additional
|
|
// permissions described in the GCC Runtime Library Exception, version
|
|
// 3.1, as published by the Free Software Foundation.
|
|
|
|
// You should have received a copy of the GNU General Public License and
|
|
// a copy of the GCC Runtime Library Exception along with this program;
|
|
// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
|
|
// <http://www.gnu.org/licenses/>.
|
|
|
|
/** @file ext/malloc_allocator.h
|
|
* This file is a GNU extension to the Standard C++ Library.
|
|
*/
|
|
|
|
#ifndef _MALLOC_ALLOCATOR_H
|
|
#define _MALLOC_ALLOCATOR_H 1
|
|
|
|
#include <cstdlib>
|
|
#include <cstddef>
|
|
#include <new>
|
|
#include <bits/functexcept.h>
|
|
#include <bits/move.h>
|
|
#if __cplusplus >= 201103L
|
|
#include <type_traits>
|
|
#endif
|
|
|
|
namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
|
|
{
|
|
_GLIBCXX_BEGIN_NAMESPACE_VERSION
|
|
|
|
using std::size_t;
|
|
using std::ptrdiff_t;
|
|
|
|
/**
|
|
* @brief An allocator that uses malloc.
|
|
* @ingroup allocators
|
|
*
|
|
* This is precisely the allocator defined in the C++ Standard.
|
|
* - all allocation calls malloc
|
|
* - all deallocation calls free
|
|
*/
|
|
template<typename _Tp>
|
|
class malloc_allocator
|
|
{
|
|
public:
|
|
typedef size_t size_type;
|
|
typedef ptrdiff_t difference_type;
|
|
typedef _Tp* pointer;
|
|
typedef const _Tp* const_pointer;
|
|
typedef _Tp& reference;
|
|
typedef const _Tp& const_reference;
|
|
typedef _Tp value_type;
|
|
|
|
template<typename _Tp1>
|
|
struct rebind
|
|
{ typedef malloc_allocator<_Tp1> other; };
|
|
|
|
#if __cplusplus >= 201103L
|
|
// _GLIBCXX_RESOLVE_LIB_DEFECTS
|
|
// 2103. propagate_on_container_move_assignment
|
|
typedef std::true_type propagate_on_container_move_assignment;
|
|
#endif
|
|
|
|
_GLIBCXX20_CONSTEXPR
|
|
malloc_allocator() _GLIBCXX_USE_NOEXCEPT { }
|
|
|
|
_GLIBCXX20_CONSTEXPR
|
|
malloc_allocator(const malloc_allocator&) _GLIBCXX_USE_NOEXCEPT { }
|
|
|
|
template<typename _Tp1>
|
|
_GLIBCXX20_CONSTEXPR
|
|
malloc_allocator(const malloc_allocator<_Tp1>&)
|
|
_GLIBCXX_USE_NOEXCEPT { }
|
|
|
|
~malloc_allocator() _GLIBCXX_USE_NOEXCEPT { }
|
|
|
|
pointer
|
|
address(reference __x) const _GLIBCXX_NOEXCEPT
|
|
{ return std::__addressof(__x); }
|
|
|
|
const_pointer
|
|
address(const_reference __x) const _GLIBCXX_NOEXCEPT
|
|
{ return std::__addressof(__x); }
|
|
|
|
// NB: __n is permitted to be 0. The C++ standard says nothing
|
|
// about what the return value is when __n == 0.
|
|
pointer
|
|
allocate(size_type __n, const void* = 0)
|
|
{
|
|
if (__n > this->max_size())
|
|
std::__throw_bad_alloc();
|
|
|
|
pointer __ret = 0;
|
|
#if __cpp_aligned_new
|
|
#if __cplusplus > 201402L && _GLIBCXX_HAVE_ALIGNED_ALLOC
|
|
if (alignof(_Tp) > alignof(std::max_align_t))
|
|
{
|
|
__ret = static_cast<_Tp*>(::aligned_alloc(alignof(_Tp),
|
|
__n * sizeof(_Tp)));
|
|
}
|
|
#else
|
|
# define _GLIBCXX_CHECK_MALLOC_RESULT
|
|
#endif
|
|
#endif
|
|
if (!__ret)
|
|
__ret = static_cast<_Tp*>(std::malloc(__n * sizeof(_Tp)));
|
|
if (!__ret)
|
|
std::__throw_bad_alloc();
|
|
#ifdef _GLIBCXX_CHECK_MALLOC_RESULT
|
|
#undef _GLIBCXX_CHECK_MALLOC_RESULT
|
|
if (reinterpret_cast<std::size_t>(__ret) % alignof(_Tp))
|
|
{
|
|
// Memory returned by malloc is not suitably aligned for _Tp.
|
|
deallocate(__ret, __n);
|
|
std::__throw_bad_alloc();
|
|
}
|
|
#endif
|
|
return __ret;
|
|
}
|
|
|
|
// __p is not permitted to be a null pointer.
|
|
void
|
|
deallocate(pointer __p, size_type)
|
|
{ std::free(static_cast<void*>(__p)); }
|
|
|
|
size_type
|
|
max_size() const _GLIBCXX_USE_NOEXCEPT
|
|
{
|
|
#if __PTRDIFF_MAX__ < __SIZE_MAX__
|
|
return size_t(__PTRDIFF_MAX__) / sizeof(_Tp);
|
|
#else
|
|
return size_t(-1) / sizeof(_Tp);
|
|
#endif
|
|
}
|
|
|
|
#if __cplusplus >= 201103L
|
|
template<typename _Up, typename... _Args>
|
|
void
|
|
construct(_Up* __p, _Args&&... __args)
|
|
noexcept(noexcept(::new((void *)__p)
|
|
_Up(std::forward<_Args>(__args)...)))
|
|
{ ::new((void *)__p) _Up(std::forward<_Args>(__args)...); }
|
|
|
|
template<typename _Up>
|
|
void
|
|
destroy(_Up* __p)
|
|
noexcept(noexcept(__p->~_Up()))
|
|
{ __p->~_Up(); }
|
|
#else
|
|
// _GLIBCXX_RESOLVE_LIB_DEFECTS
|
|
// 402. wrong new expression in [some_] allocator::construct
|
|
void
|
|
construct(pointer __p, const _Tp& __val)
|
|
{ ::new((void *)__p) value_type(__val); }
|
|
|
|
void
|
|
destroy(pointer __p) { __p->~_Tp(); }
|
|
#endif
|
|
|
|
template<typename _Up>
|
|
friend bool
|
|
operator==(const malloc_allocator&, const malloc_allocator<_Up>&)
|
|
_GLIBCXX_NOTHROW
|
|
{ return true; }
|
|
|
|
template<typename _Up>
|
|
friend bool
|
|
operator!=(const malloc_allocator&, const malloc_allocator<_Up>&)
|
|
_GLIBCXX_NOTHROW
|
|
{ return false; }
|
|
};
|
|
|
|
_GLIBCXX_END_NAMESPACE_VERSION
|
|
} // namespace
|
|
|
|
#endif
|