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Ruta de la carpeta: \\game3dprogramming\materials\GameFactory\GameFactoryDemo\references\boost_1_35_0\boost\variant\detail\forced_return.hpp
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//----------------------------------------------------------------------------- // boost variant/detail/forced_return.hpp header file // See http://www.boost.org for updates, documentation, and revision history. //----------------------------------------------------------------------------- // // Copyright (c) 2003 // Eric Friedman // // 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) #ifndef BOOST_VARIANT_DETAIL_FORCED_RETURN_HPP #define BOOST_VARIANT_DETAIL_FORCED_RETURN_HPP #include "boost/config.hpp" #include "boost/variant/detail/generic_result_type.hpp" #include "boost/assert.hpp" #if !defined(BOOST_MSVC) && !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION) # include "boost/type_traits/remove_reference.hpp" #endif namespace boost { namespace detail { namespace variant { /////////////////////////////////////////////////////////////////////////////// // (detail) function template forced_return // // Logical error to permit invocation at runtime, but (artificially) satisfies // compile-time requirement of returning a result value. // #if !defined(BOOST_MSVC) \ && !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION) \ && !defined(BOOST_NO_VOID_RETURNS) // "standard" implementation: template
inline T forced_return( BOOST_EXPLICIT_TEMPLATE_TYPE(T) ) { // logical error: should never be here! (see above) BOOST_ASSERT(false); typedef typename boost::remove_reference
::type basic_type; basic_type* dummy = 0; return *static_cast< basic_type* >(dummy); } template <> inline void forced_return
( BOOST_EXPLICIT_TEMPLATE_TYPE_SPEC(void) ) { // logical error: should never be here! (see above) BOOST_ASSERT(false); } #elif !defined(BOOST_MSVC) // workaround implementation // // TODO: Determine the most efficient way to handle this -- as below? by // throwing? by recursive call to forced_return itself? etc. // template
inline BOOST_VARIANT_AUX_GENERIC_RESULT_TYPE(T) forced_return( BOOST_EXPLICIT_TEMPLATE_TYPE(T) ) { // logical error: should never be here! (see above) BOOST_ASSERT(false); BOOST_VARIANT_AUX_GENERIC_RESULT_TYPE(T) (*dummy)() = 0; return dummy(); } #else // defined(BOOST_MSVC) // msvc-specific implementation // // Leverages __declspec(noreturn) for optimized implementation. // __declspec(noreturn) inline void forced_return_no_return() {}; template
inline BOOST_VARIANT_AUX_GENERIC_RESULT_TYPE(T) forced_return( BOOST_EXPLICIT_TEMPLATE_TYPE(T) ) { // logical error: should never be here! (see above) BOOST_ASSERT(false); forced_return_no_return(); } #endif // BOOST_MSVC optimization }} // namespace detail::variant } // namespace boost #endif // BOOST_VARIANT_DETAIL_FORCED_RETURN_HPP
forced_return.hpp
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