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Edit File : extptr_allocator.h \| Size : 6.04 KB
// <extptr_allocator.h> -- C++ -- // Copyright (C) 2008-2018 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/extptr_allocator.h * This file is a GNU extension to the Standard C++ Library. * * @author Bob Walters * * An example allocator which uses an alternative pointer type from * bits/pointer.h. Supports test cases which confirm container support * for alternative pointers. / #ifndef _EXTPTR_ALLOCATOR_H #define _EXTPTR_ALLOCATOR_H 1 #include <memory> #include <ext/numeric_traits.h> #include <ext/pointer.h> namespace __gnu_cxx _GLIBCXX_VISIBILITY(default) { _GLIBCXX_BEGIN_NAMESPACE_VERSION /* * @brief An example allocator which uses a non-standard pointer type. * @ingroup allocators * * This allocator specifies that containers use a 'relative pointer' as it's * pointer type. (See ext/pointer.h) Memory allocation in this example * is still performed using std::allocator. / template<typename _Tp> class _ExtPtr_allocator { public: typedef std::size_t size_type; typedef std::ptrdiff_t difference_type; // Note the non-standard pointer types. typedef _Pointer_adapter<_Relative_pointer_impl<_Tp> > pointer; typedef _Pointer_adapter<_Relative_pointer_impl<const _Tp> > const_pointer; typedef _Tp& reference; typedef const _Tp& const_reference; typedef _Tp value_type; template<typename _Up> struct rebind { typedef _ExtPtr_allocator<_Up> other; }; _ExtPtr_allocator() _GLIBCXX_USE_NOEXCEPT : _M_real_alloc() { } _ExtPtr_allocator(const _ExtPtr_allocator& __rarg) _GLIBCXX_USE_NOEXCEPT : _M_real_alloc(__rarg._M_real_alloc) { } template<typename _Up> _ExtPtr_allocator(const _ExtPtr_allocator<_Up>& __rarg) _GLIBCXX_USE_NOEXCEPT : _M_real_alloc(__rarg._M_getUnderlyingImp()) { } ~_ExtPtr_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); } pointer allocate(size_type __n, void __hint = 0) { return _M_real_alloc.allocate(__n,__hint); } void deallocate(pointer __p, size_type __n) { _M_real_alloc.deallocate(__p.get(), __n); } size_type max_size() const _GLIBCXX_USE_NOEXCEPT { return __numeric_traits<size_type>::__max / sizeof(_Tp); } #if __cplusplus >= 201103L template<typename _Up, typename... _Args> void construct(_Up* __p, _Args&&... __args) { ::new((void )__p) _Up(std::forward<_Args>(__args)...); } template<typename... _Args> void construct(pointer __p, _Args&&... __args) { construct(__p.get(), std::forward<_Args>(__args)...); } template<typename _Up> void destroy(_Up __p) { __p->~_Up(); } void destroy(pointer __p) { destroy(__p.get()); } #else void construct(pointer __p, const _Tp& __val) { ::new(__p.get()) _Tp(__val); } void destroy(pointer __p) { __p->~_Tp(); } #endif template<typename _Up> inline bool operator==(const _ExtPtr_allocator<_Up>& __rarg) { return _M_real_alloc == __rarg._M_getUnderlyingImp(); } inline bool operator==(const _ExtPtr_allocator& __rarg) { return _M_real_alloc == __rarg._M_real_alloc; } template<typename _Up> inline bool operator!=(const _ExtPtr_allocator<_Up>& __rarg) { return _M_real_alloc != __rarg._M_getUnderlyingImp(); } inline bool operator!=(const _ExtPtr_allocator& __rarg) { return _M_real_alloc != __rarg._M_real_alloc; } template<typename _Up> inline friend void swap(_ExtPtr_allocator<_Up>&, _ExtPtr_allocator<_Up>&); // A method specific to this implementation. const std::allocator<_Tp>& _M_getUnderlyingImp() const { return _M_real_alloc; } private: std::allocator<_Tp> _M_real_alloc; }; // _ExtPtr_allocator<void> specialization. template<> class _ExtPtr_allocator<void> { public: typedef std::size_t size_type; typedef std::ptrdiff_t difference_type; typedef void value_type; // Note the non-standard pointer types typedef _Pointer_adapter<_Relative_pointer_impl<void> > pointer; typedef _Pointer_adapter<_Relative_pointer_impl<const void> > const_pointer; template<typename _Up> struct rebind { typedef _ExtPtr_allocator<_Up> other; }; private: std::allocator<void> _M_real_alloc; }; template<typename _Tp> inline void swap(_ExtPtr_allocator<_Tp>& __larg, _ExtPtr_allocator<_Tp>& __rarg) { std::allocator<_Tp> __tmp( __rarg._M_real_alloc ); __rarg._M_real_alloc = __larg._M_real_alloc; __larg._M_real_alloc = __tmp; } _GLIBCXX_END_NAMESPACE_VERSION } // namespace #endif /* _EXTPTR_ALLOCATOR_H */ Back

Edit File : extptr_allocator.h | Size : 6.04 KB

// <extptr_allocator.h> -*- C++ -*-

// Copyright (C) 2008-2018 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/extptr_allocator.h
 *  This file is a GNU extension to the Standard C++ Library.
 *
 *  @author Bob Walters
 *
 * An example allocator which uses an alternative pointer type from
 * bits/pointer.h.  Supports test cases which confirm container support
 * for alternative pointers.
 */

#ifndef _EXTPTR_ALLOCATOR_H
#define _EXTPTR_ALLOCATOR_H 1

#include <memory>
#include <ext/numeric_traits.h>
#include <ext/pointer.h>

namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION

/**
   * @brief An example allocator which uses a non-standard pointer type.
   * @ingroup allocators
   *
   * This allocator specifies that containers use a 'relative pointer' as it's
   * pointer type.  (See ext/pointer.h)  Memory allocation in this example
   * is still performed using std::allocator.
   */
  template<typename _Tp>
    class _ExtPtr_allocator
    {
    public:
      typedef std::size_t     size_type;
      typedef std::ptrdiff_t  difference_type;

// Note the non-standard pointer types.
      typedef _Pointer_adapter<_Relative_pointer_impl<_Tp> >       pointer;
      typedef _Pointer_adapter<_Relative_pointer_impl<const _Tp> > 
                                                             const_pointer;

typedef _Tp&       reference;
      typedef const _Tp& const_reference;
      typedef _Tp        value_type;

template<typename _Up>
        struct rebind
        { typedef _ExtPtr_allocator<_Up> other; };

_ExtPtr_allocator() _GLIBCXX_USE_NOEXCEPT 
      : _M_real_alloc() { }

_ExtPtr_allocator(const _ExtPtr_allocator& __rarg) _GLIBCXX_USE_NOEXCEPT
      : _M_real_alloc(__rarg._M_real_alloc) { }

template<typename _Up>
        _ExtPtr_allocator(const _ExtPtr_allocator<_Up>& __rarg)
	_GLIBCXX_USE_NOEXCEPT
        : _M_real_alloc(__rarg._M_getUnderlyingImp()) { }

~_ExtPtr_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); }

pointer allocate(size_type __n, void* __hint = 0)
      { return _M_real_alloc.allocate(__n,__hint); }

void deallocate(pointer __p, size_type __n)
      { _M_real_alloc.deallocate(__p.get(), __n); }

size_type max_size() const _GLIBCXX_USE_NOEXCEPT
      { return __numeric_traits<size_type>::__max / sizeof(_Tp); }

#if __cplusplus >= 201103L
      template<typename _Up, typename... _Args>
        void
        construct(_Up* __p, _Args&&... __args)
	{ ::new((void *)__p) _Up(std::forward<_Args>(__args)...); }

template<typename... _Args>
        void
        construct(pointer __p, _Args&&... __args)
	{ construct(__p.get(), std::forward<_Args>(__args)...); }

template<typename _Up>
        void 
        destroy(_Up* __p)
        { __p->~_Up(); }

void destroy(pointer __p)
      { destroy(__p.get()); }

#else

void construct(pointer __p, const _Tp& __val)
      { ::new(__p.get()) _Tp(__val); }

void destroy(pointer __p)
      { __p->~_Tp(); }
#endif

template<typename _Up>
        inline bool
        operator==(const _ExtPtr_allocator<_Up>& __rarg)
        { return _M_real_alloc == __rarg._M_getUnderlyingImp(); }

inline bool
      operator==(const _ExtPtr_allocator& __rarg)
      { return _M_real_alloc == __rarg._M_real_alloc; }

template<typename _Up>
        inline bool
        operator!=(const _ExtPtr_allocator<_Up>& __rarg)
        { return _M_real_alloc != __rarg._M_getUnderlyingImp(); }

inline bool
      operator!=(const _ExtPtr_allocator& __rarg)
      { return _M_real_alloc != __rarg._M_real_alloc; }

template<typename _Up>
        inline friend void
        swap(_ExtPtr_allocator<_Up>&, _ExtPtr_allocator<_Up>&);

// A method specific to this implementation.
      const std::allocator<_Tp>&
      _M_getUnderlyingImp() const
      { return _M_real_alloc; }

private:
      std::allocator<_Tp>  _M_real_alloc;
    };

// _ExtPtr_allocator<void> specialization.
  template<>
    class _ExtPtr_allocator<void>
    {
    public:
      typedef std::size_t      size_type;
      typedef std::ptrdiff_t   difference_type;
      typedef void             value_type;

// Note the non-standard pointer types
      typedef _Pointer_adapter<_Relative_pointer_impl<void> >       pointer;
      typedef _Pointer_adapter<_Relative_pointer_impl<const void> >
                                                              const_pointer;

template<typename _Up>
        struct rebind
        { typedef _ExtPtr_allocator<_Up> other; };

private:
      std::allocator<void>  _M_real_alloc;
    };

template<typename _Tp>
    inline void
    swap(_ExtPtr_allocator<_Tp>& __larg, _ExtPtr_allocator<_Tp>& __rarg)
    {
      std::allocator<_Tp> __tmp( __rarg._M_real_alloc );
      __rarg._M_real_alloc = __larg._M_real_alloc;
      __larg._M_real_alloc = __tmp;
    }

_GLIBCXX_END_NAMESPACE_VERSION
} // namespace

#endif /* _EXTPTR_ALLOCATOR_H */

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