65 lines
1.9 KiB
Plaintext
65 lines
1.9 KiB
Plaintext
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//-----------------------------------------------------------------------------
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// boost variant/detail/forced_return.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 Eric Friedman
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// Copyright (c) 2015-2016 Antony Polukhin
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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_FORCED_RETURN_HPP
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#define BOOST_VARIANT_DETAIL_FORCED_RETURN_HPP
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#include <boost/config.hpp>
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#include <boost/variant/detail/generic_result_type.hpp>
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#include <boost/assert.hpp>
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#include <cstdlib> // std::abort
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#ifdef BOOST_MSVC
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# pragma warning( push )
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# pragma warning( disable : 4702 ) // unreachable code
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#endif
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namespace boost { namespace detail { namespace variant {
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BOOST_NORETURN inline void forced_return_no_return() { // fixes `must return a value` warnings
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using namespace std;
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abort(); // some implementations have no std::abort
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}
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///////////////////////////////////////////////////////////////////////////////
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// (detail) function template forced_return
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//
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// Logical error to permit invocation at runtime, but (artificially) satisfies
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// compile-time requirement of returning a result value.
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//
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template <typename T>
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BOOST_NORETURN inline
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BOOST_VARIANT_AUX_GENERIC_RESULT_TYPE(T)
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forced_return()
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{
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// logical error: should never be here! (see above)
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BOOST_ASSERT(false);
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forced_return_no_return();
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#ifdef BOOST_NO_NORETURN
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BOOST_VARIANT_AUX_GENERIC_RESULT_TYPE(T) (*dummy)() = 0;
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return dummy();
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#endif
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}
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}}} // namespace boost::detail::variant
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#ifdef BOOST_MSVC
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# pragma warning( pop )
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#endif
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#endif // BOOST_VARIANT_DETAIL_FORCED_RETURN_HPP
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