1 /* 2 * Copyright 2002, The libsigc++ Development Team 3 * 4 * This library is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU Lesser General Public 6 * License as published by the Free Software Foundation; either 7 * version 2.1 of the License, or (at your option) any later version. 8 * 9 * This library is distributed in the hope that it will be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 12 * Lesser General Public License for more details. 13 * 14 * You should have received a copy of the GNU Lesser General Public 15 * License along with this library; if not, write to the Free Software 16 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 17 * 18 */ 19 #ifndef _SIGC_TYPE_TRAIT_H_ 20 #define _SIGC_TYPE_TRAIT_H_ 21 22 #include <sigc++config.h> 23 24 25 namespace sigc { 26 27 template <class T_type> 28 struct type_trait 29 { 30 typedef T_type& pass; 31 typedef const T_type& take; 32 }; 33 34 template <class T_type, int N> 35 struct type_trait<T_type[N]> 36 { 37 typedef T_type*& pass; 38 typedef const T_type*& take; 39 }; 40 41 template <class T_type> 42 struct type_trait<T_type&> 43 { 44 typedef T_type& pass; 45 typedef T_type& take; 46 }; 47 48 template <class T_type> 49 struct type_trait<const T_type&> 50 { 51 typedef const T_type& pass; 52 typedef const T_type& take; 53 }; 54 55 template<> 56 struct type_trait<void> 57 { 58 typedef void pass; 59 typedef void take; 60 }; 61 62 template<typename T> 63 using type_trait_pass_t = typename type_trait<T>::pass; 64 65 template<typename T> 66 using type_trait_take_t = typename type_trait<T>::take; 67 68 } /* namespace sigc */ 69 70 #endif /* _SIGC_TYPE_TRAIT_H_ */ 71