cartographer: gauge.cc Source File

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00001 /*
00002  * Copyright 2018 The Cartographer Authors
00003  *
00004  * Licensed under the Apache License, Version 2.0 (the "License");
00005  * you may not use this file except in compliance with the License.
00006  * You may obtain a copy of the License at
00007  *
00008  *      http://www.apache.org/licenses/LICENSE-2.0
00009  *
00010  * Unless required by applicable law or agreed to in writing, software
00011  * distributed under the License is distributed on an "AS IS" BASIS,
00012  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
00013  * See the License for the specific language governing permissions and
00014  * limitations under the License.
00015  */
00016 
00017 #include "cartographer/metrics/gauge.h"
00018 
00019 namespace cartographer {
00020 namespace metrics {
00021 
00022 namespace {
00023 
00024 // Implementation of gauge that does nothing.
00025 class NullGauge : public Gauge {
00026  public:
00027   void Increment() override{};
00028   void Increment(double) override{};
00029   void Decrement() override{};
00030   void Decrement(double) override{};
00031   void Set(double) override{};
00032 };
00033 
00034 }  // namespace
00035 
00036 Gauge* Gauge::Null() {
00037   static NullGauge null_gauge;
00038   return &null_gauge;
00039 }
00040 
00041 }  // namespace metrics
00042 }  // namespace cartographer