40 lines
1.0 KiB
C++
40 lines
1.0 KiB
C++
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/*
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* Copyright 2018 The Cartographer 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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*/
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#include "cartographer/metrics/counter.h"
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namespace cartographer {
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namespace metrics {
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namespace {
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// Implementation of counter that does nothing.
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class NullCounter : public Counter {
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public:
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void Increment() override{};
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void Increment(double) override{};
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};
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} // namespace
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Counter* Counter::Null() {
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static NullCounter null_counter;
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return &null_counter;
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}
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} // namespace metrics
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} // namespace cartographer
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