Initial Commit

2018-02-08 21:28:33 -05:00
commit 678c1d3966
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+// Boost.Range library
+//
+//  Copyright Arno Schoedl & Neil Groves 2009.
+//  Use, modification and distribution is subject to 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)
+//
+// For more information, see http://www.boost.org/libs/range/
+//
+#ifndef BOOST_RANGE_DETAIL_EXTRACT_OPTIONAL_TYPE_HPP_INCLUDED
+#define BOOST_RANGE_DETAIL_EXTRACT_OPTIONAL_TYPE_HPP_INCLUDED
+
+#if defined(_MSC_VER)
+# pragma once
+#endif
+
+#include <boost/config.hpp>
+#include <boost/preprocessor/cat.hpp>
+#include <boost/mpl/has_xxx.hpp>
+
+#if !defined(BOOST_MPL_CFG_NO_HAS_XXX)
+
+// Defines extract_some_typedef<T> which exposes T::some_typedef as
+// extract_some_typedef<T>::type if T::some_typedef exists. Otherwise
+// extract_some_typedef<T> is empty.
+#define BOOST_RANGE_EXTRACT_OPTIONAL_TYPE( a_typedef )                          \
+    BOOST_MPL_HAS_XXX_TRAIT_DEF(a_typedef)                                      \
+    template< typename  C, bool B = BOOST_PP_CAT(has_, a_typedef)<C>::value >   \
+    struct BOOST_PP_CAT(extract_, a_typedef)                                    \
+    {};                                                                         \
+    template< typename C >                                                      \
+    struct BOOST_PP_CAT(extract_, a_typedef)< C, true >                         \
+    {                                                                           \
+        typedef BOOST_DEDUCED_TYPENAME C::a_typedef type;                       \
+    };
+
+#else
+
+#define BOOST_RANGE_EXTRACT_OPTIONAL_TYPE( a_typedef )                          \
+    template< typename C >                                                      \
+    struct BOOST_PP_CAT(extract_, a_typedef)                                    \
+    {                                                                           \
+        typedef BOOST_DEDUCED_TYPENAME C::a_typedef type;                       \
+    };
+
+#endif
+
+#endif // include guard