boost/implicit_cast.hpp

   1 // Copyright David Abrahams 2003.
   2 // Distributed under the Boost Software License, Version 1.0. (See
   3 // accompanying file LICENSE_1_0.txt or copy at
   4 // http://www.boost.org/LICENSE_1_0.txt)
   5 #ifndef IMPLICIT_CAST_DWA200356_HPP
   6 # define IMPLICIT_CAST_DWA200356_HPP
   7
   8 # include <boost/mpl/identity.hpp>
   9
  10 namespace boost {
  11
  12 // implementation originally suggested by C. Green in
  13 // http://lists.boost.org/MailArchives/boost/msg00886.php
  14
  15 // The use of identity creates a non-deduced form, so that the
  16 // explicit template argument must be supplied
  17 template <typename T>
  18 inline T implicit_cast (typename mpl::identity<T>::type x) {
  19     return x;
  20 }
  21
  22 // incomplete return type now is here
  23 //template <typename T>
  24 //void implicit_cast (...);
  25
  26 } // namespace boost
  27
  28
  29 #endif // IMPLICIT_CAST_DWA200356_HPP