Edit: /usr/include/boost/asio/associated_allocator.hpp (3791B)
//
// associated_allocator.hpp
// ~~~~~~~~~~~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2020 Christopher M. Kohlhoff (chris at kohlhoff dot com)
//
// 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)
//
#ifndef BOOST_ASIO_ASSOCIATED_ALLOCATOR_HPP
#define BOOST_ASIO_ASSOCIATED_ALLOCATOR_HPP
#if defined(_MSC_VER) && (_MSC_VER >= 1200)
# pragma once
#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
#include
#include
#include
#include
namespace boost {
namespace asio {
namespace detail {
template
struct associated_allocator_impl
{
typedef E type;
static type get(const T&, const E& e) BOOST_ASIO_NOEXCEPT
{
return e;
}
};
template
struct associated_allocator_impl::type>
{
typedef typename T::allocator_type type;
static type get(const T& t, const E&) BOOST_ASIO_NOEXCEPT
{
return t.get_allocator();
}
};
} // namespace detail
/// Traits type used to obtain the allocator associated with an object.
/**
* A program may specialise this traits type if the @c T template parameter in
* the specialisation is a user-defined type. The template parameter @c
* Allocator shall be a type meeting the Allocator requirements.
*
* Specialisations shall meet the following requirements, where @c t is a const
* reference to an object of type @c T, and @c a is an object of type @c
* Allocator.
*
* @li Provide a nested typedef @c type that identifies a type meeting the
* Allocator requirements.
*
* @li Provide a noexcept static member function named @c get, callable as @c
* get(t) and with return type @c type.
*
* @li Provide a noexcept static member function named @c get, callable as @c
* get(t,a) and with return type @c type.
*/
template >
struct associated_allocator
{
/// If @c T has a nested type @c allocator_type, T::allocator_type.
/// Otherwise @c Allocator.
#if defined(GENERATING_DOCUMENTATION)
typedef see_below type;
#else // defined(GENERATING_DOCUMENTATION)
typedef typename detail::associated_allocator_impl::type type;
#endif // defined(GENERATING_DOCUMENTATION)
/// If @c T has a nested type @c allocator_type, returns
/// t.get_allocator(). Otherwise returns @c a.
static type get(const T& t,
const Allocator& a = Allocator()) BOOST_ASIO_NOEXCEPT
{
return detail::associated_allocator_impl::get(t, a);
}
};
/// Helper function to obtain an object's associated allocator.
/**
* @returns associated_allocator::get(t)
*/
template
inline typename associated_allocator::type
get_associated_allocator(const T& t) BOOST_ASIO_NOEXCEPT
{
return associated_allocator::get(t);
}
/// Helper function to obtain an object's associated allocator.
/**
* @returns associated_allocator::get(t, a)
*/
template
inline typename associated_allocator::type
get_associated_allocator(const T& t, const Allocator& a) BOOST_ASIO_NOEXCEPT
{
return associated_allocator::get(t, a);
}
#if defined(BOOST_ASIO_HAS_ALIAS_TEMPLATES)
template >
using associated_allocator_t
= typename associated_allocator::type;
#endif // defined(BOOST_ASIO_HAS_ALIAS_TEMPLATES)
} // namespace asio
} // namespace boost
#include
#endif // BOOST_ASIO_ASSOCIATED_ALLOCATOR_HPP