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//////////////////////////////////////////////////////////////////////////////
//
// (C) Copyright Ion Gaztanaga 2014-2015. Distributed under the Boost
// Software License, Version 1.0. (See accompanying file
// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
// See http://www.boost.org/libs/container for documentation.
//
//////////////////////////////////////////////////////////////////////////////
#ifndef BOOST_CONTAINER_NEW_ALLOCATOR_HPP
#define BOOST_CONTAINER_NEW_ALLOCATOR_HPP
#ifndef BOOST_CONFIG_HPP
# include <boost/config.hpp>
#endif
#if defined(BOOST_HAS_PRAGMA_ONCE)
# pragma once
#endif
#include <boost/container/detail/config_begin.hpp>
#include <boost/container/detail/workaround.hpp>
#include <boost/container/throw_exception.hpp>
#include <cstddef>
//!\file
namespace boost {
namespace container {
/// @cond
template<bool Value>
struct new_allocator_bool
{ static const bool value = Value; };
template<class T>
class new_allocator;
/// @endcond
//! Specialization of new_allocator for void types
template<>
class new_allocator<void>
{
public:
typedef void value_type;
typedef void * pointer;
typedef const void* const_pointer;
//!A integral constant of type bool with value true
typedef BOOST_CONTAINER_IMPDEF(new_allocator_bool<true>) propagate_on_container_move_assignment;
//!A integral constant of type bool with value true
typedef BOOST_CONTAINER_IMPDEF(new_allocator_bool<true>) is_always_equal;
// reference-to-void members are impossible
//!Obtains an new_allocator that allocates
//!objects of type T2
template<class T2>
struct rebind
{
typedef new_allocator< T2> other;
};
//!Default constructor
//!Never throws
new_allocator() BOOST_NOEXCEPT_OR_NOTHROW
{}
//!Constructor from other new_allocator.
//!Never throws
new_allocator(const new_allocator &) BOOST_NOEXCEPT_OR_NOTHROW
{}
//!Constructor from related new_allocator.
//!Never throws
template<class T2>
new_allocator(const new_allocator<T2> &) BOOST_NOEXCEPT_OR_NOTHROW
{}
//!Swaps two allocators, does nothing
//!because this new_allocator is stateless
friend void swap(new_allocator &, new_allocator &) BOOST_NOEXCEPT_OR_NOTHROW
{}
//!An new_allocator always compares to true, as memory allocated with one
//!instance can be deallocated by another instance
friend bool operator==(const new_allocator &, const new_allocator &) BOOST_NOEXCEPT_OR_NOTHROW
{ return true; }
//!An new_allocator always compares to false, as memory allocated with one
//!instance can be deallocated by another instance
friend bool operator!=(const new_allocator &, const new_allocator &) BOOST_NOEXCEPT_OR_NOTHROW
{ return false; }
};
//! This class is a reduced STL-compatible allocator that allocates memory using operator new
template<class T>
class new_allocator
{
public:
typedef T value_type;
typedef T * pointer;
typedef const T * const_pointer;
typedef T & reference;
typedef const T & const_reference;
typedef std::size_t size_type;
typedef std::ptrdiff_t difference_type;
//!A integral constant of type bool with value true
typedef BOOST_CONTAINER_IMPDEF(new_allocator_bool<true>) propagate_on_container_move_assignment;
//!A integral constant of type bool with value true
typedef BOOST_CONTAINER_IMPDEF(new_allocator_bool<true>) is_always_equal;
//!Obtains an new_allocator that allocates
//!objects of type T2
template<class T2>
struct rebind
{
typedef new_allocator<T2> other;
};
//!Default constructor
//!Never throws
new_allocator() BOOST_NOEXCEPT_OR_NOTHROW
{}
//!Constructor from other new_allocator.
//!Never throws
new_allocator(const new_allocator &) BOOST_NOEXCEPT_OR_NOTHROW
{}
//!Constructor from related new_allocator.
//!Never throws
template<class T2>
new_allocator(const new_allocator<T2> &) BOOST_NOEXCEPT_OR_NOTHROW
{}
//!Allocates memory for an array of count elements.
//!Throws std::bad_alloc if there is no enough memory
pointer allocate(size_type count)
{
if(BOOST_UNLIKELY(count > this->max_size()))
throw_bad_alloc();
return static_cast<T*>(::operator new(count*sizeof(T)));
}
//!Deallocates previously allocated memory.
//!Never throws
void deallocate(pointer ptr, size_type) BOOST_NOEXCEPT_OR_NOTHROW
{ ::operator delete((void*)ptr); }
//!Returns the maximum number of elements that could be allocated.
//!Never throws
size_type max_size() const BOOST_NOEXCEPT_OR_NOTHROW
{ return size_type(-1)/sizeof(T); }
//!Swaps two allocators, does nothing
//!because this new_allocator is stateless
friend void swap(new_allocator &, new_allocator &) BOOST_NOEXCEPT_OR_NOTHROW
{}
//!An new_allocator always compares to true, as memory allocated with one
//!instance can be deallocated by another instance
friend bool operator==(const new_allocator &, const new_allocator &) BOOST_NOEXCEPT_OR_NOTHROW
{ return true; }
//!An new_allocator always compares to false, as memory allocated with one
//!instance can be deallocated by another instance
friend bool operator!=(const new_allocator &, const new_allocator &) BOOST_NOEXCEPT_OR_NOTHROW
{ return false; }
};
} //namespace container {
} //namespace boost {
#include <boost/container/detail/config_end.hpp>
#endif //BOOST_CONTAINER_NEW_ALLOCATOR_HPP
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