1 /* 2 * Copyright (C) 2017 The Android Open Source Project 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 LIBTEXTCLASSIFIER_UTIL_GTL_STL_UTIL_H_ 18 #define LIBTEXTCLASSIFIER_UTIL_GTL_STL_UTIL_H_ 19 20 namespace libtextclassifier2 { 21 22 // Deletes all the elements in an STL container and clears the container. This 23 // function is suitable for use with a vector, set, hash_set, or any other STL 24 // container which defines sensible begin(), end(), and clear() methods. 25 // If container is NULL, this function is a no-op. 26 template <typename T> 27 void STLDeleteElements(T *container) { 28 if (!container) return; 29 auto it = container->begin(); 30 while (it != container->end()) { 31 auto temp = it; 32 ++it; 33 delete *temp; 34 } 35 container->clear(); 36 } 37 38 // Given an STL container consisting of (key, value) pairs, STLDeleteValues 39 // deletes all the "value" components and clears the container. Does nothing in 40 // the case it's given a nullptr. 41 template <typename T> 42 void STLDeleteValues(T *container) { 43 if (!container) return; 44 auto it = container->begin(); 45 while (it != container->end()) { 46 auto temp = it; 47 ++it; 48 delete temp->second; 49 } 50 container->clear(); 51 } 52 53 } // namespace libtextclassifier2 54 55 #endif // LIBTEXTCLASSIFIER_UTIL_GTL_STL_UTIL_H_ 56
