Mercurial > octave-nkf
view liboctave/lo-traits.h @ 8725:d5af326a3ede
[mq]: sort-traits
author | John W. Eaton <jwe@octave.org> |
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date | Thu, 12 Feb 2009 02:49:14 -0500 |
parents | |
children | 0f6683a8150a |
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/* Copyright (C) 2009 John W. Eaton This file is part of Octave. Octave is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version. Octave is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with Octave; see the file COPYING. If not, see <http://www.gnu.org/licenses/>. */ #if !defined (octave_liboctave_traits_h) #define octave_liboctave_traits_h 1 template <bool cond, typename T1, typename T2> class if_then_else; template<typename T1, typename T2> class if_then_else<true, T1, T2> { public: typedef T1 result; }; template<typename T1, typename T2> class if_then_else<false, T1, T2> { public: typedef T2 result; }; template<typename T1> class is_class_type { private: typedef char one; typedef struct { char c[2]; } two; // Classes can have pointers to members. template<typename T2> static one is_class_type_test (int T2::*); // Catch everything else. template<typename T2> static two is_class_type_test (...); public: enum { yes = sizeof (is_class_type_test<T1> (0)) == 1 }; enum { no = ! yes }; }; template<typename T> class ref_param { public: typedef typename if_then_else<is_class_type<T>::no, T, T const&>::result type; }; #endif /* ;;; Local Variables: *** ;;; mode: C *** ;;; page-delimiter: "^/\\*" *** ;;; End: *** */