mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-11-18 13:42:02 +00:00
78 lines
2.5 KiB
C++
78 lines
2.5 KiB
C++
//////////////////////////////////////////////////////////////////////////////
|
|
//
|
|
// (C) Copyright Ion Gaztanaga 2009-2012.
|
|
// 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/move for documentation.
|
|
//
|
|
//////////////////////////////////////////////////////////////////////////////
|
|
|
|
//! \file
|
|
|
|
#ifndef BOOST_MOVE_TRAITS_HPP
|
|
#define BOOST_MOVE_TRAITS_HPP
|
|
|
|
#ifndef BOOST_CONFIG_HPP
|
|
# include <boost/config.hpp>
|
|
#endif
|
|
#
|
|
#if defined(BOOST_HAS_PRAGMA_ONCE)
|
|
# pragma once
|
|
#endif
|
|
|
|
#include <boost/move/detail/config_begin.hpp>
|
|
|
|
#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
|
|
#include <boost/move/core.hpp>
|
|
#endif
|
|
#include <boost/move/detail/meta_utils.hpp>
|
|
#include <boost/move/detail/type_traits.hpp>
|
|
|
|
namespace boost {
|
|
|
|
//! If this trait yields to true
|
|
//! (<i>has_trivial_destructor_after_move <T>::value == true</i>)
|
|
//! means that if T is used as argument of a move construction/assignment,
|
|
//! there is no need to call T's destructor.
|
|
//! This optimization tipically is used to improve containers' performance.
|
|
//!
|
|
//! By default this trait is true if the type has trivial destructor,
|
|
//! every class should specialize this trait if it wants to improve performance
|
|
//! when inserted in containers.
|
|
template <class T>
|
|
struct has_trivial_destructor_after_move
|
|
: ::boost::move_detail::is_trivially_destructible<T>
|
|
{};
|
|
|
|
//! By default this traits returns
|
|
//! <pre>boost::is_nothrow_move_constructible<T>::value && boost::is_nothrow_move_assignable<T>::value </pre>.
|
|
//! Classes with non-throwing move constructor
|
|
//! and assignment can specialize this trait to obtain some performance improvements.
|
|
template <class T>
|
|
struct has_nothrow_move
|
|
{
|
|
static const bool value = boost::move_detail::is_nothrow_move_constructible<T>::value &&
|
|
boost::move_detail::is_nothrow_move_assignable<T>::value;
|
|
};
|
|
|
|
namespace move_detail {
|
|
|
|
template <class T>
|
|
struct is_nothrow_move_constructible_or_uncopyable
|
|
{
|
|
//The standard requires is_nothrow_move_constructible for move_if_noexcept
|
|
//but a user (usually in C++03) might specialize has_nothrow_move which includes it
|
|
static const bool value = is_nothrow_move_constructible<T>::value ||
|
|
has_nothrow_move<T>::value ||
|
|
!is_copy_constructible<T>::value;
|
|
};
|
|
|
|
} //move_detail {
|
|
} //namespace boost {
|
|
|
|
#include <boost/move/detail/config_end.hpp>
|
|
|
|
#endif //#ifndef BOOST_MOVE_TRAITS_HPP
|