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  • Committer: Package Import Robot
  • Author(s): Steve M. Robbins
  • Date: 2012-02-26 00:31:44 UTC
  • Revision ID: package-import@ubuntu.com-20120226003144-eaytp12cbf6ubpms
Tags: upstream-1.49.0
Import upstream version 1.49.0

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boost/utility/declval.hpp
 
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//  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