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
20namespace 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.
26template <typename T>
27void 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.
41template <typename T>
42void 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