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// Copyright David Abrahams 2003.
// 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 IMPLICIT_CAST_DWA200356_HPP
# define IMPLICIT_CAST_DWA200356_HPP
# include <boost/mpl/identity.hpp>
namespace boost {
// implementation originally suggested by C. Green in
// http://lists.boost.org/MailArchives/boost/msg00886.php
// The use of identity creates a non-deduced form, so that the
// explicit template argument must be supplied
template <typename T>
inline T implicit_cast (typename mpl::identity<T>::type x) {
return x;
}
// incomplete return type now is here
//template <typename T>
//void implicit_cast (...);
// Macro for when you need a constant expression (Gennaro Prota)
#define BOOST_IMPLICIT_CAST(dst_type, expr) \
( sizeof( implicit_cast<dst_type>(expr) ) \
, \
static_cast<dst_type>(expr) \
)
} // namespace boost
#endif // IMPLICIT_CAST_DWA200356_HPP