Add operator for TemperatureChangeRate * Duration/TimeSpan (#1102)

Co-authored-by: Sören Schäffersmann <[email protected]>

Add multiplication operators to TemperatureChangeRate to multiply with TimeSpan and Duration to get TemperatureDelta.

Author: sschaeffersmann

UnitsNet.Tests/CustomCode/TemperatureChangeRateTests.cs

@@ -1,6 +1,9 @@
 // Licensed under MIT No Attribution, see LICENSE file at the root.
 // Copyright 2013 Andreas Gullberg Larsen ([email protected]). Maintained at https://github.com/angularsen/UnitsNet.
 
+using System;
+using Xunit;
+
 namespace UnitsNet.Tests.CustomCode
 {
     public class TemperatureChangeRateTests : TemperatureChangeRateTestsBase
@@ -24,6 +27,34 @@ public class TemperatureChangeRateTests : TemperatureChangeRateTestsBase
 
         protected override double NanodegreesCelsiusPerSecondInOneDegreeCelsiusPerSecond => 1E9;
 
-		protected override double DegreesCelsiusPerMinuteInOneDegreeCelsiusPerSecond => 60;
+        protected override double DegreesCelsiusPerMinuteInOneDegreeCelsiusPerSecond => 60;
+
+        [Fact]
+        public void TemperatureChangeRateMultipliedWithTimeSpanEqualsTemperatureDelta()
+        {
+            TemperatureDelta d = TemperatureChangeRate.FromDegreesCelsiusPerSecond(2) * new TimeSpan(0, 0, 10);
+            Assert.Equal(TemperatureDelta.FromDegreesCelsius(20), d);
+        }
+
+        [Fact]
+        public void TimeSpanMultipliedWithTemperatureChangeRateEqualsTemperatureDelta()
+        {
+            TemperatureDelta d = new TimeSpan(0, 0, -10) * TemperatureChangeRate.FromDegreesCelsiusPerSecond(2);
+            Assert.Equal(TemperatureDelta.FromDegreesCelsius(-20), d);
+        }
+
+        [Fact]
+        public void TemperatureChangeRateMultipliedWithDurationEqualsTemperatureDelta()
+        {
+            TemperatureDelta d = TemperatureChangeRate.FromDegreesCelsiusPerSecond(2) * Duration.FromSeconds(10);
+            Assert.Equal(TemperatureDelta.FromDegreesCelsius(20), d);
+        }
+
+        [Fact]
+        public void DurationMultipliedWithTemperatureChangeRateEqualsTemperatureDelta()
+        {
+            TemperatureDelta d = Duration.FromSeconds(-10) * TemperatureChangeRate.FromDegreesCelsiusPerSecond(2);
+            Assert.Equal(TemperatureDelta.FromDegreesCelsius(-20), d);
+        }
     }
 }

UnitsNet/CustomCode/Quantities/TemperatureChangeRate.extra.cs

@@ -0,0 +1,29 @@
+// Licensed under MIT No Attribution, see LICENSE file at the root.
+// Copyright 2013 Andreas Gullberg Larsen ([email protected]). Maintained at https://github.com/angularsen/UnitsNet.
+
+using System;
+
+namespace UnitsNet
+{
+    public partial struct TemperatureChangeRate
+    {
+        /// <summary>Get <see cref="TemperatureDelta"/> from <see cref="Duration"/> times <see cref="TemperatureChangeRate"/>.</summary>
+        public static TemperatureDelta operator *(Duration left, TemperatureChangeRate right) => right * left;
+
+        /// <summary>Get <see cref="TemperatureDelta"/> from <see cref="TemperatureChangeRate"/> times <see cref="Duration"/>.</summary>
+        public static TemperatureDelta operator *(TemperatureChangeRate left, Duration right)
+        {
+            return TemperatureDelta.FromDegreesCelsius(left.DegreesCelsiusPerSecond * right.Seconds);
+        }
+
+
+        /// <summary>Get <see cref="TemperatureDelta"/> from <see cref="TimeSpan"/> times <see cref="TemperatureChangeRate"/>.</summary>
+        public static TemperatureDelta operator *(TimeSpan left, TemperatureChangeRate right) => right * left;
+
+        /// <summary>Get <see cref="TemperatureDelta"/> from <see cref="TemperatureChangeRate"/> times <see cref="TimeSpan"/>.</summary>
+        public static TemperatureDelta operator *(TemperatureChangeRate left, TimeSpan right)
+        {
+            return TemperatureDelta.FromDegreesCelsius(left.DegreesCelsiusPerSecond * right.TotalSeconds);
+        }
+    }
+}