89 lines
2.3 KiB
Plaintext
89 lines
2.3 KiB
Plaintext
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//-----------------------------------------------------------------------------
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// boost variant/detail/generic_result_type.hpp header file
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// See http://www.boost.org for updates, documentation, and revision history.
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//-----------------------------------------------------------------------------
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//
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// Copyright (c) 2003
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// Eric Friedman
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//
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// Distributed under the Boost Software License, Version 1.0. (See
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// accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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#ifndef BOOST_VARIANT_DETAIL_GENERIC_RESULT_TYPE_HPP
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#define BOOST_VARIANT_DETAIL_GENERIC_RESULT_TYPE_HPP
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#include <boost/config.hpp>
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//////////////////////////////////////////////////////////////////////////
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// (workaround) macro BOOST_VARIANT_AUX_GENERIC_RESULT_TYPE
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//
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// On compilers with BOOST_NO_VOID_RETURNS, this macro provides a route
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// to a single syntax for dealing with template functions that may (but
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// not necessarily) return nothing (i.e. void).
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//
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// BOOST_VARIANT_AUX_RETURN_VOID provided for compilers w/ (erroneous?)
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// warnings about non-void functions not returning a value.
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//
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#if !defined(BOOST_NO_VOID_RETURNS)
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#define BOOST_VARIANT_AUX_GENERIC_RESULT_TYPE(T) \
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T \
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/**/
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#define BOOST_VARIANT_AUX_RETURN_VOID \
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/**/
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#define BOOST_VARIANT_AUX_RETURN_VOID_TYPE \
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void \
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/**/
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#else // defined(BOOST_NO_VOID_RETURNS)
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namespace boost {
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namespace detail { namespace variant {
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struct fake_return_void
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{
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fake_return_void()
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{
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}
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template <typename T>
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fake_return_void(const T&)
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{
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}
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};
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template <typename T>
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struct no_void_returns_helper
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{
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typedef T type;
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};
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template <>
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struct no_void_returns_helper<void>
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{
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typedef fake_return_void type;
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};
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}} // namespace detail::variant
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} // namespace boost
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#define BOOST_VARIANT_AUX_GENERIC_RESULT_TYPE(T) \
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BOOST_DEDUCED_TYPENAME \
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::boost::detail::variant::no_void_returns_helper< T >::type \
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/**/
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#define BOOST_VARIANT_AUX_RETURN_VOID \
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return ::boost::detail::variant::fake_return_void() \
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/**/
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#define BOOST_VARIANT_AUX_RETURN_VOID_TYPE \
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::boost::detail::variant::fake_return_void
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#endif // BOOST_NO_VOID_RETURNS workaround
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#endif // BOOST_VARIANT_DETAIL_GENERIC_RESULT_TYPE_HPP
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