mirror of
https://git.lyx.org/repos/lyx.git
synced 2025-01-11 03:03:06 +00:00
376aaac146
git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@13298 a592a061-630c-0410-9148-cb99ea01b6c8
36 lines
1.1 KiB
C++
36 lines
1.1 KiB
C++
// 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
|