diff options
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.hpp | 72 |
1 files changed, 72 insertions, 0 deletions
diff --git a/3rdParty/Boost/src/boost/signals2/detail/result_type_wrapper.hpp b/3rdParty/Boost/src/boost/signals2/detail/result_type_wrapper.hpp new file mode 100644 index 0000000..35dea7c --- /dev/null +++ b/3rdParty/Boost/src/boost/signals2/detail/result_type_wrapper.hpp @@ -0,0 +1,72 @@ +// 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 |