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Diffstat (limited to '3rdParty/Boost/src/boost/signals2/detail/result_type_wrapper.hpp')
-rw-r--r--3rdParty/Boost/src/boost/signals2/detail/result_type_wrapper.hpp72
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diff --git a/3rdParty/Boost/src/boost/signals2/detail/result_type_wrapper.hpp b/3rdParty/Boost/src/boost/signals2/detail/result_type_wrapper.hpp
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+// Boost.Signals2 library
+
+// Copyright Douglas Gregor 2001-2004.
+// Copyright Frank Mori Hess 2007. 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
+
+#ifndef BOOST_SIGNALS2_RESULT_TYPE_WRAPPER_HPP
+#define BOOST_SIGNALS2_RESULT_TYPE_WRAPPER_HPP
+
+#include <boost/config.hpp>
+
+namespace boost {
+ namespace signals2 {
+ namespace detail {
+ // A placeholder for void on compilers that don't support void returns
+ struct void_type {};
+
+ // Replaces void with void_type
+ template<typename R>
+ struct nonvoid {
+ typedef R type;
+ };
+ template<>
+ struct nonvoid<void> {
+ typedef void_type type;
+ };
+
+ // Replaces void with void_type only if compiler doesn't support void returns
+ template<typename R>
+ struct result_type_wrapper {
+ typedef R type;
+ };
+#ifdef BOOST_NO_VOID_RETURNS
+ template<>
+ struct result_type_wrapper<void> {
+ typedef void_type type;
+ };
+#endif
+
+ // specialization deals with possible void return from combiners
+ template<typename R> class combiner_invoker
+ {
+ public:
+ typedef R result_type;
+ template<typename Combiner, typename InputIterator>
+ result_type operator()(Combiner &combiner,
+ InputIterator first, InputIterator last) const
+ {
+ return combiner(first, last);
+ }
+ };
+ template<> class combiner_invoker<void>
+ {
+ public:
+ typedef result_type_wrapper<void>::type result_type;
+ template<typename Combiner, typename InputIterator>
+ result_type operator()(Combiner &combiner,
+ InputIterator first, InputIterator last) const
+ {
+ combiner(first, last);
+ return result_type();
+ }
+ };
+ } // end namespace detail
+ } // end namespace signals2
+} // end namespace boost
+
+#endif // BOOST_SIGNALS2_RESULT_TYPE_WRAPPER_HPP