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Diffstat (limited to '3rdParty/Boost/src/boost/variant/detail/generic_result_type.hpp')
-rw-r--r-- | 3rdParty/Boost/src/boost/variant/detail/generic_result_type.hpp | 88 |
1 files changed, 88 insertions, 0 deletions
diff --git a/3rdParty/Boost/src/boost/variant/detail/generic_result_type.hpp b/3rdParty/Boost/src/boost/variant/detail/generic_result_type.hpp new file mode 100644 index 0000000..b3fbb19 --- /dev/null +++ b/3rdParty/Boost/src/boost/variant/detail/generic_result_type.hpp @@ -0,0 +1,88 @@ +//----------------------------------------------------------------------------- +// boost variant/detail/generic_result_type.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_GENERIC_RESULT_TYPE_HPP +#define BOOST_VARIANT_DETAIL_GENERIC_RESULT_TYPE_HPP + +#include "boost/config.hpp" + +////////////////////////////////////////////////////////////////////////// +// (workaround) macro BOOST_VARIANT_AUX_GENERIC_RESULT_TYPE +// +// On compilers with BOOST_NO_VOID_RETURNS, this macro provides a route +// to a single syntax for dealing with template functions that may (but +// not necessarily) return nothing (i.e. void). +// +// BOOST_VARIANT_AUX_RETURN_VOID provided for compilers w/ (erroneous?) +// warnings about non-void functions not returning a value. +// + +#if !defined(BOOST_NO_VOID_RETURNS) + +#define BOOST_VARIANT_AUX_GENERIC_RESULT_TYPE(T) \ + T \ + /**/ + +#define BOOST_VARIANT_AUX_RETURN_VOID \ + /**/ + +#define BOOST_VARIANT_AUX_RETURN_VOID_TYPE \ + void \ + /**/ + +#else // defined(BOOST_NO_VOID_RETURNS) + +namespace boost { +namespace detail { namespace variant { + +struct fake_return_void +{ + fake_return_void() + { + } + + template <typename T> + fake_return_void(const T&) + { + } +}; + +template <typename T> +struct no_void_returns_helper +{ + typedef T type; +}; + +template <> +struct no_void_returns_helper<void> +{ + typedef fake_return_void type; +}; + +}} // namespace detail::variant +} // namespace boost + +#define BOOST_VARIANT_AUX_GENERIC_RESULT_TYPE(T) \ + BOOST_DEDUCED_TYPENAME \ + ::boost::detail::variant::no_void_returns_helper< T >::type \ + /**/ + +#define BOOST_VARIANT_AUX_RETURN_VOID \ + return ::boost::detail::variant::fake_return_void() \ + /**/ + +#define BOOST_VARIANT_AUX_RETURN_VOID_TYPE \ + ::boost::detail::variant::fake_return_void + +#endif // BOOST_NO_VOID_RETURNS workaround + +#endif // BOOST_VARIANT_DETAIL_GENERIC_RESULT_TYPE_HPP |