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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
    {}
 
    //!Copy assignment operator from other new_allocator.
    //!Never throws
    new_allocator& operator=(const new_allocator &) BOOST_NOEXCEPT_OR_NOTHROW
    {
        return *this;
    }
 
    //!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
    {}
 
    //!Copy assignment operator from other new_allocator.
    //!Never throws
    new_allocator& operator=(const new_allocator &) BOOST_NOEXCEPT_OR_NOTHROW
    {
        return *this;
    }
 
    //!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 bad_alloc if there is no enough memory
    pointer allocate(size_type count)
    {
       const std::size_t max_count = std::size_t(-1)/(2*sizeof(T));
       if(BOOST_UNLIKELY(count > max_count))
          throw_bad_alloc();
       return static_cast<T*>(::operator new(count*sizeof(T)));
    }
 
    //!Deallocates previously allocated memory.
    //!Never throws
    void deallocate(pointer ptr, size_type n) BOOST_NOEXCEPT_OR_NOTHROW
    {
       (void)n;
       # if __cpp_sized_deallocation
       ::operator delete((void*)ptr, n * sizeof(T));
       #else
       ::operator delete((void*)ptr);
       # endif
    }
 
    //!Returns the maximum number of elements that could be allocated.
    //!Never throws
    size_type max_size() const BOOST_NOEXCEPT_OR_NOTHROW
    {  return std::size_t(-1)/(2*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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