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 libtextclassifier {
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>
STLDeleteElements(T * container)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>
STLDeleteValues(T * container)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 libtextclassifier
54
55 #endif // LIBTEXTCLASSIFIER_UTIL_GTL_STL_UTIL_H_
56