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author | Stefan Radomski <github@mintwerk.de> | 2016-05-12 13:12:33 (GMT) |
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committer | Stefan Radomski <github@mintwerk.de> | 2016-05-12 13:12:33 (GMT) |
commit | b62e7979600feee23dc7cdb61042a8fc7673122b (patch) | |
tree | f7351372f37979dd2d048e0b68a16a4cd3b2aadb /contrib/src/boost/move/traits.hpp | |
parent | 1b11b310be61e51b3ac5ebb83f7c8a33aef3d6e8 (diff) | |
download | uscxml-b62e7979600feee23dc7cdb61042a8fc7673122b.zip uscxml-b62e7979600feee23dc7cdb61042a8fc7673122b.tar.gz uscxml-b62e7979600feee23dc7cdb61042a8fc7673122b.tar.bz2 |
Major Refactoring v2.0
Diffstat (limited to 'contrib/src/boost/move/traits.hpp')
-rw-r--r-- | contrib/src/boost/move/traits.hpp | 77 |
1 files changed, 77 insertions, 0 deletions
diff --git a/contrib/src/boost/move/traits.hpp b/contrib/src/boost/move/traits.hpp new file mode 100644 index 0000000..b48b8f6 --- /dev/null +++ b/contrib/src/boost/move/traits.hpp @@ -0,0 +1,77 @@ +////////////////////////////////////////////////////////////////////////////// +// +// (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 |