2 * Copyright 2016 Facebook, Inc.
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
8 * http://www.apache.org/licenses/LICENSE-2.0
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.
17 #include <folly/ContainerTraits.h>
19 #include <folly/portability/GTest.h>
22 using namespace folly;
27 Node(const Node& n) noexcept { copies = n.copies; ++copies; }
28 Node(Node&& n) noexcept { swap(copies, n.copies); ++copies; }
35 vector<T>& underlying;
36 explicit VectorWrapper(vector<T>& v) : underlying(v) {}
37 void push_back(const T& t) { underlying.push_back(t); }
40 TEST(ContainerTraits, WithoutEmplaceBack) {
42 VectorWrapper<Node> vw(v);
43 container_emplace_back_or_push_back(vw);
44 EXPECT_EQ(1, v.at(0).copies);
47 TEST(ContainerTraits, WithEmplaceBack) {
49 container_emplace_back_or_push_back(v);
50 EXPECT_EQ(0, v.at(0).copies);