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Diffstat (limited to 'boost/move/detail/meta_utils_core.hpp')
-rw-r--r-- | boost/move/detail/meta_utils_core.hpp | 118 |
1 files changed, 118 insertions, 0 deletions
diff --git a/boost/move/detail/meta_utils_core.hpp b/boost/move/detail/meta_utils_core.hpp new file mode 100644 index 0000000000..283242bd03 --- /dev/null +++ b/boost/move/detail/meta_utils_core.hpp @@ -0,0 +1,118 @@ +////////////////////////////////////////////////////////////////////////////// +// +// (C) Copyright Ion Gaztanaga 2015-2015. +// 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/move for documentation. +// +////////////////////////////////////////////////////////////////////////////// + +//! \file + +#ifndef BOOST_MOVE_DETAIL_META_UTILS_CORE_HPP +#define BOOST_MOVE_DETAIL_META_UTILS_CORE_HPP + +#ifndef BOOST_CONFIG_HPP +# include <boost/config.hpp> +#endif +# +#if defined(BOOST_HAS_PRAGMA_ONCE) +# pragma once +#endif + +//Small meta-typetraits to support move + +namespace boost { +namespace move_detail { + +////////////////////////////////////// +// if_c +////////////////////////////////////// +template<bool C, typename T1, typename T2> +struct if_c +{ + typedef T1 type; +}; + +template<typename T1, typename T2> +struct if_c<false,T1,T2> +{ + typedef T2 type; +}; + +////////////////////////////////////// +// if_ +////////////////////////////////////// +template<typename T1, typename T2, typename T3> +struct if_ : if_c<0 != T1::value, T2, T3> +{}; + +//enable_if_ +template <bool B, class T = void> +struct enable_if_c +{ + typedef T type; +}; + +////////////////////////////////////// +// enable_if_c +////////////////////////////////////// +template <class T> +struct enable_if_c<false, T> {}; + +////////////////////////////////////// +// enable_if +////////////////////////////////////// +template <class Cond, class T = void> +struct enable_if : enable_if_c<Cond::value, T> {}; + +////////////////////////////////////// +// disable_if +////////////////////////////////////// +template <class Cond, class T = void> +struct disable_if : enable_if_c<!Cond::value, T> {}; + +////////////////////////////////////// +// integral_constant +////////////////////////////////////// +template<class T, T v> +struct integral_constant +{ + static const T value = v; + typedef T value_type; + typedef integral_constant<T, v> type; +}; + +typedef integral_constant<bool, true > true_type; +typedef integral_constant<bool, false > false_type; + +////////////////////////////////////// +// identity +////////////////////////////////////// +template <class T> +struct identity +{ + typedef T type; +}; + +////////////////////////////////////// +// is_same +////////////////////////////////////// +template<class T, class U> +struct is_same +{ + static const bool value = false; +}; + +template<class T> +struct is_same<T, T> +{ + static const bool value = true; +}; + +} //namespace move_detail { +} //namespace boost { + +#endif //#ifndef BOOST_MOVE_DETAIL_META_UTILS_CORE_HPP |