1 /* 2 * Copyright 2014 Google Inc. All rights reserved. 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef FRUIT_META_PAIR_H 18 #define FRUIT_META_PAIR_H 19 20 #include <fruit/impl/meta/basics.h> 21 22 namespace fruit { 23 namespace impl { 24 namespace meta { 25 26 template <typename First1, typename Second1> 27 struct Pair { 28 using First = First1; 29 using Second = Second1; 30 }; 31 32 struct MakePair { 33 template <typename First, typename Second> 34 struct apply { 35 using type = Pair<First, Second>; 36 }; 37 }; 38 39 struct GetFirst { 40 template <typename P> 41 struct apply { 42 using type = typename P::First; 43 }; 44 }; 45 46 struct GetSecond { 47 template <typename P> 48 struct apply { 49 using type = typename P::Second; 50 }; 51 }; 52 53 } // namespace meta 54 } // namespace impl 55 } // namespace fruit 56 57 #endif // FRUIT_META_PAIR_H 58
