Initial Commit

2018-02-08 21:28:33 -05:00
commit 678c1d3966
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+/* Copyright 2003-2014 Joaquin M Lopez Munoz.
+ * 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/multi_index for library home page.
+ */
+
+#ifndef BOOST_MULTI_INDEX_DETAIL_IS_TRANSPARENT_HPP
+#define BOOST_MULTI_INDEX_DETAIL_IS_TRANSPARENT_HPP
+
+#if defined(_MSC_VER)
+#pragma once
+#endif
+
+#include <boost/config.hpp> /* keep it first to prevent nasty warns in MSVC */
+#include <boost/mpl/bool.hpp>
+#include <boost/type_traits/intrinsics.hpp>
+
+namespace boost{
+
+namespace multi_index{
+
+namespace detail{
+
+/* Metafunction that checks if f(arg,arg2) executes without argument type
+ * conversion. By default (i.e. when it cannot be determined) it evaluates to
+ * true.
+ */
+
+template<typename F,typename Arg1,typename Arg2,typename=void>
+struct is_transparent:mpl::true_{};
+
+} /* namespace multi_index::detail */
+
+} /* namespace multi_index */
+
+} /* namespace boost */
+
+#if !defined(BOOST_NO_SFINAE)&&!defined(BOOST_NO_SFINAE_EXPR)&& \
+    !defined(BOOST_NO_CXX11_DECLTYPE)&& \
+    (defined(BOOST_NO_CXX11_FINAL)||defined(BOOST_IS_FINAL))
+
+#include <boost/mpl/and.hpp>
+#include <boost/mpl/not.hpp>
+#include <boost/mpl/or.hpp>
+#include <boost/type_traits/function_traits.hpp>
+#include <boost/type_traits/is_class.hpp>
+#include <boost/type_traits/is_final.hpp>
+#include <boost/type_traits/is_function.hpp>
+#include <boost/type_traits/is_same.hpp>
+#include <boost/type_traits/remove_pointer.hpp>
+#include <boost/utility/declval.hpp>
+#include <boost/utility/enable_if.hpp>
+
+namespace boost{
+
+namespace multi_index{
+
+namespace detail{
+
+struct not_is_transparent_result_type{};
+
+template<typename F,typename Arg1,typename Arg2>
+struct is_transparent_class_helper:F
+{
+  using F::operator();
+  template<typename T,typename Q>
+  not_is_transparent_result_type operator()(const T&,const Q&)const;
+};
+
+template<typename F,typename Arg1,typename Arg2,typename=void>
+struct is_transparent_class:mpl::true_{};
+
+template<typename F,typename Arg1,typename Arg2>
+struct is_transparent_class<
+  F,Arg1,Arg2,
+  typename enable_if<
+    is_same<
+      decltype(
+        declval<const is_transparent_class_helper<F,Arg1,Arg2> >()(
+          declval<const Arg1&>(),declval<const Arg2&>())
+      ),
+      not_is_transparent_result_type
+    >
+  >::type
+>:mpl::false_{};
+
+template<typename F,typename Arg1,typename Arg2>
+struct is_transparent<
+  F,Arg1,Arg2,
+  typename enable_if<
+    mpl::and_<
+      is_class<F>,
+      mpl::not_<is_final<F> > /* is_transparent_class_helper derives from F */
+    >
+  >::type
+>:is_transparent_class<F,Arg1,Arg2>{};
+
+template<typename F,typename Arg1,typename Arg2,typename=void>
+struct is_transparent_function:mpl::true_{};
+
+template<typename F,typename Arg1,typename Arg2>
+struct is_transparent_function<
+  F,Arg1,Arg2,
+  typename enable_if<
+    mpl::or_<
+      mpl::not_<mpl::or_<
+        is_same<typename function_traits<F>::arg1_type,const Arg1&>,
+        is_same<typename function_traits<F>::arg1_type,Arg1>
+      > >,
+      mpl::not_<mpl::or_<
+        is_same<typename function_traits<F>::arg2_type,const Arg2&>,
+        is_same<typename function_traits<F>::arg2_type,Arg2>
+      > >
+    >
+  >::type
+>:mpl::false_{};
+
+template<typename F,typename Arg1,typename Arg2>
+struct is_transparent<
+  F,Arg1,Arg2,
+  typename enable_if<
+    is_function<typename remove_pointer<F>::type>
+  >::type
+>:is_transparent_function<typename remove_pointer<F>::type,Arg1,Arg2>{};
+
+} /* namespace multi_index::detail */
+
+} /* namespace multi_index */
+
+} /* namespace boost */
+
+#endif
+#endif