90 lines
2.7 KiB
C++
90 lines
2.7 KiB
C++
// Copyright 2019 The MediaPipe Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "mediapipe/framework/deps/registration_token.h"
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#include <utility>
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namespace mediapipe {
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RegistrationToken::RegistrationToken(std::function<void()> unregisterer)
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: unregister_function_(std::move(unregisterer)) {}
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RegistrationToken::RegistrationToken(RegistrationToken&& rhs)
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: unregister_function_(std::move(rhs.unregister_function_)) {
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rhs.unregister_function_ = nullptr;
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}
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RegistrationToken& RegistrationToken::operator=(RegistrationToken&& rhs) {
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if (&rhs != this) {
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unregister_function_ = std::move(rhs.unregister_function_);
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rhs.unregister_function_ = nullptr;
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}
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return *this;
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}
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void RegistrationToken::Unregister() {
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if (unregister_function_ != nullptr) {
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unregister_function_();
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unregister_function_ = nullptr;
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}
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}
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namespace {
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struct CombinedToken {
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void operator()() {
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for (auto& f : functions) {
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f();
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}
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}
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std::vector<std::function<void()>> functions;
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};
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} // anonymous namespace
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// static
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RegistrationToken RegistrationToken::Combine(
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std::vector<RegistrationToken> tokens) {
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CombinedToken combined;
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// When vector grows, it only moves elements if the move constructor is marked
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// noexcept (or if the element isn't copyable). In related news, function's
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// move constructor is not marked noexcept. By reserving the correct amount of
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// space up front, we remove the need for the vector to grow, and thus
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// eliminate copies.
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combined.functions.reserve(tokens.size());
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for (RegistrationToken& token : tokens) {
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combined.functions.push_back(std::move(token.unregister_function_));
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}
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return RegistrationToken(std::move(combined));
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}
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Unregister::Unregister(RegistrationToken token) : token_(std::move(token)) {}
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Unregister::~Unregister() { token_.Unregister(); }
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Unregister::Unregister(Unregister&& rhs) : token_(std::move(rhs.token_)) {}
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Unregister& Unregister::operator=(Unregister&& rhs) {
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if (&rhs != this) {
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token_.Unregister();
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token_ = std::move(rhs.token_);
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}
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return *this;
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}
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void Unregister::Reset(RegistrationToken token) {
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token_.Unregister();
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token_ = std::move(token);
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}
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} // namespace mediapipe
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