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// Copyright 2005-2009 Daniel James.
// 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)
// A couple of templates to make using allocators easier.
#ifndef BOOST_UNORDERED_DETAIL_ALLOCATOR_UTILITIES_HPP_INCLUDED
#define BOOST_UNORDERED_DETAIL_ALLOCATOR_UTILITIES_HPP_INCLUDED
#if defined(_MSC_VER) && (_MSC_VER >= 1020)
# pragma once
#endif
#include <boost/config.hpp>
#if (defined(BOOST_NO_STD_ALLOCATOR) || defined(BOOST_DINKUMWARE_STDLIB)) \
&& !defined(__BORLANDC__)
# define BOOST_UNORDERED_USE_ALLOCATOR_UTILITIES
#endif
#if defined(BOOST_UNORDERED_USE_ALLOCATOR_UTILITIES)
# include <boost/detail/allocator_utilities.hpp>
#endif
namespace boost { namespace unordered_detail {
// rebind_wrap
//
// Rebind allocators. For some problematic libraries, use rebind_to
// from <boost/detail/allocator_utilities.hpp>.
#if defined(BOOST_UNORDERED_USE_ALLOCATOR_UTILITIES)
template <class Alloc, class T>
struct rebind_wrap : ::boost::detail::allocator::rebind_to<Alloc, T> {};
#else
template <class Alloc, class T>
struct rebind_wrap
{
typedef BOOST_DEDUCED_TYPENAME
Alloc::BOOST_NESTED_TEMPLATE rebind<T>::other
type;
};
#endif
// allocator_array_constructor
//
// Allocate and construct an array in an exception safe manner, and
// clean up if an exception is thrown before the container takes charge
// of it.
template <class Allocator>
struct allocator_array_constructor
{
typedef BOOST_DEDUCED_TYPENAME Allocator::pointer pointer;
Allocator& alloc_;
pointer ptr_;
pointer constructed_;
std::size_t length_;
allocator_array_constructor(Allocator& a)
: alloc_(a), ptr_(), constructed_(), length_(0)
{
constructed_ = pointer();
ptr_ = pointer();
}
~allocator_array_constructor() {
if (ptr_) {
for(pointer p = ptr_; p != constructed_; ++p)
alloc_.destroy(p);
alloc_.deallocate(ptr_, length_);
}
}
template <class V>
void construct(V const& v, std::size_t l)
{
BOOST_ASSERT(!ptr_);
length_ = l;
ptr_ = alloc_.allocate(length_);
pointer end = ptr_ + static_cast<std::ptrdiff_t>(length_);
for(constructed_ = ptr_; constructed_ != end; ++constructed_)
alloc_.construct(constructed_, v);
}
pointer get() const
{
return ptr_;
}
pointer release()
{
pointer p(ptr_);
ptr_ = pointer();
return p;
}
private:
allocator_array_constructor(allocator_array_constructor const&);
allocator_array_constructor& operator=(
allocator_array_constructor const&);
};
}}
#if defined(BOOST_UNORDERED_USE_ALLOCATOR_UTILITIES)
# undef BOOST_UNORDERED_USE_ALLOCATOR_UTILITIES
#endif
#endif
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