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srcs/RobotNet10/RobotApp/Communication/CartographerSharp/Metrics/Counter.cs

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+/*
+ * Copyright 2018 The Cartographer Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+namespace CartographerSharp.Metrics;
+
+/// <summary>
+/// Counter metric for accumulating values.
+/// </summary>
+public abstract class Counter
+{
+    /// <summary>
+    /// Counter instance that does nothing. Safe for use in static initializers.
+    /// </summary>
+    public static Counter Null()
+    {
+        return new NullCounter();
+    }
+
+    /// <summary>
+    /// Increments the counter by 1.
+    /// </summary>
+    public abstract void Increment();
+
+    /// <summary>
+    /// Increments the counter by the specified value.
+    /// </summary>
+    public abstract void Increment(double byValue);
+}
+
+/// <summary>
+/// Null implementation of counter that does nothing.
+/// </summary>
+internal class NullCounter : Counter
+{
+    public override void Increment()
+    {
+        // Do nothing
+    }
+
+    public override void Increment(double byValue)
+    {
+        // Do nothing
+    }
+}