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44 lines
1.8 KiB
44 lines
1.8 KiB
// common_type.hpp ---------------------------------------------------------// |
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// Copyright 2010 Vicente J. Botet Escriba |
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// Distributed under the Boost Software License, Version 1.0. |
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// See http://www.boost.org/LICENSE_1_0.txt |
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#ifndef BOOST_TYPE_TRAITS_EXT_DECLVAL__HPP |
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#define BOOST_TYPE_TRAITS_EXT_DECLVAL__HPP |
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#include <boost/config.hpp> |
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//----------------------------------------------------------------------------// |
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#include <boost/type_traits/add_rvalue_reference.hpp> |
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//----------------------------------------------------------------------------// |
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// // |
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// C++03 implementation of // |
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// Written by Vicente J. Botet Escriba // |
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//~ 20.3.4 Function template declval [declval] |
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//~ 1 The library provides the function template declval to simplify the definition of expressions which occur as |
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//~ unevaluated operands. |
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//~ 2 Remarks: If this function is used, the program is ill-formed. |
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//~ 3 Remarks: The template parameter T of declval may be an incomplete type. |
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//~ [ Example: |
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//~ template <class To, class From> |
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//~ decltype(static_cast<To>(declval<From>())) convert(From&&); |
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//~ declares a function template convert which only participats in overloading if the type From can be |
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//~ explicitly converted to type To. For another example see class template common_type (20.7.6.6). —end |
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//~ example ] |
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// // |
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//----------------------------------------------------------------------------// |
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namespace boost { |
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template <typename T> |
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typename add_rvalue_reference<T>::type declval(); //noexcept; // as unevaluated operand |
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} // namespace boost |
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#endif // BOOST_TYPE_TRAITS_EXT_DECLVAL__HPP
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