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Chapter17/cib/libs/boost/mp11/detail/mp_map_find.hpp

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+#ifndef BOOST_MP11_DETAIL_MP_MAP_FIND_HPP_INCLUDED
+#define BOOST_MP11_DETAIL_MP_MAP_FIND_HPP_INCLUDED
+
+//  Copyright 2015 Peter Dimov.
+//
+//  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
+
+#include <boost/mp11/utility.hpp>
+#include <boost/mp11/detail/config.hpp>
+
+#if BOOST_MP11_WORKAROUND( BOOST_MP11_MSVC, < 1930 )
+
+// not exactly good practice, but...
+namespace std
+{
+    template<class... _Types> class tuple;
+}
+
+#endif
+
+namespace boost
+{
+namespace mp11
+{
+
+// mp_map_find
+namespace detail
+{
+
+#if !BOOST_MP11_WORKAROUND( BOOST_MP11_MSVC, < 1930 )
+
+template<class T> using mpmf_wrap = mp_identity<T>;
+template<class T> using mpmf_unwrap = typename T::type;
+
+#else
+
+template<class... T> struct mpmf_tuple {};
+
+template<class T> struct mpmf_wrap_impl
+{
+    using type = mp_identity<T>;
+};
+
+template<class... T> struct mpmf_wrap_impl< std::tuple<T...> >
+{
+    using type = mp_identity< mpmf_tuple<T...> >;
+};
+
+template<class T> using mpmf_wrap = typename mpmf_wrap_impl<T>::type;
+
+template<class T> struct mpmf_unwrap_impl
+{
+    using type = typename T::type;
+};
+
+template<class... T> struct mpmf_unwrap_impl< mp_identity< mpmf_tuple<T...> > >
+{
+    using type = std::tuple<T...>;
+};
+
+template<class T> using mpmf_unwrap = typename mpmf_unwrap_impl<T>::type;
+
+#endif // #if !BOOST_MP11_WORKAROUND( BOOST_MP11_MSVC, < 1930 )
+
+template<class M, class K> struct mp_map_find_impl;
+
+template<template<class...> class M, class... T, class K> struct mp_map_find_impl<M<T...>, K>
+{
+    using U = mp_inherit<mpmf_wrap<T>...>;
+
+    template<template<class...> class L, class... U> static mp_identity<L<K, U...>> f( mp_identity<L<K, U...>>* );
+    static mp_identity<void> f( ... );
+
+    using type = mpmf_unwrap< decltype( f( static_cast<U*>(0) ) ) >;
+};
+
+} // namespace detail
+
+template<class M, class K> using mp_map_find = typename detail::mp_map_find_impl<M, K>::type;
+
+} // namespace mp11
+} // namespace boost
+
+#endif // #ifndef BOOST_MP11_DETAIL_MP_MAP_FIND_HPP_INCLUDED