Add Operators for the relationship Volume = VolumeFlow/TimeSpan

UnitsNet.Tests/CustomCode/DurationTests.cs

@@ -207,5 +207,12 @@ public static void TimeSpanNotEqualToDurationShouldReturnCorrectly()
             Duration duration = Duration.FromHours(11);
             Assert.True(timeSpan != duration, "timeSpan should not be equal to duration");
         }
+
+        [Fact]
+        public void DurationTimesVolumeFlowEqualsVolume()
+        {
+            Volume volume = Duration.FromSeconds(20) * VolumeFlow.FromCubicMetersPerSecond(2);
+            Assert.Equal(Volume.FromCubicMeters(40), volume);
+        }
     }
 }

UnitsNet.Tests/CustomCode/VolumeFlowTests.cs

@@ -39,6 +39,9 @@
 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 // THE SOFTWARE.
 
+using System;
+using Xunit;
+
 namespace UnitsNet.Tests.CustomCode
 {
     public class VolumeFlowTests : VolumeFlowTestsBase
@@ -88,5 +91,19 @@ public class VolumeFlowTests : VolumeFlowTestsBase
         protected override double UsGallonsPerHourInOneCubicMeterPerSecond => 9.510193884893328E5;
 
         protected override double UsGallonsPerSecondInOneCubicMeterPerSecond => 2.64172052358148E2;
+
+        [Fact]
+        public void VolumeFlowTimesTimeSpanEqualsVolume()
+        {
+            Volume volume = VolumeFlow.FromCubicMetersPerSecond(20) * TimeSpan.FromSeconds(2);
+            Assert.Equal(Volume.FromCubicMeters(40), volume);
+        }
+
+        [Fact]
+        public void VolumeFlowTimesDurationEqualsVolume()
+        {
+            Volume volume = VolumeFlow.FromCubicMetersPerSecond(20) * Duration.FromSeconds(2);
+            Assert.Equal(Volume.FromCubicMeters(40), volume);
+        }
     }
 }

UnitsNet.Tests/CustomCode/VolumeTests.cs

@@ -19,6 +19,7 @@
 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 // THE SOFTWARE.
 
+using System;
 using Xunit;
 
 namespace UnitsNet.Tests.CustomCode
@@ -125,5 +126,26 @@ public void VolumeTimesDensityEqualsMass()
             Mass mass = Volume.FromCubicMeters(2)*Density.FromKilogramsPerCubicMeter(3);
             Assert.Equal(mass, Mass.FromKilograms(6));
         }
+
+        [Fact]
+        public void VolumeDividedByTimeSpanEqualsVolumeFlow()
+        {
+            VolumeFlow volumeFlow = Volume.FromCubicMeters(20) / TimeSpan.FromSeconds(2);
+            Assert.Equal(VolumeFlow.FromCubicMetersPerSecond(10), volumeFlow);
+        }
+
+        [Fact]
+        public void VolumeDividedByDurationEqualsVolumeFlow()
+        {
+            VolumeFlow volumeFlow = Volume.FromCubicMeters(20) / Duration.FromSeconds(2);
+            Assert.Equal(VolumeFlow.FromCubicMetersPerSecond(10), volumeFlow);
+        }
+
+        [Fact]
+        public void VolumeDividedByVolumeFlowEqualsTimeSpan()
+        {
+            TimeSpan timeSpan = Volume.FromCubicMeters(20) / VolumeFlow.FromCubicMetersPerSecond(2);
+            Assert.Equal(TimeSpan.FromSeconds(10), timeSpan);
+        }
     }
 }

UnitsNet/CustomCode/Quantities/Duration.extra.cs

@@ -113,6 +113,11 @@ public static explicit operator Duration(TimeSpan duration)
         {
             return timeSpan.TotalSeconds != duration.Seconds;
         }
+
+        public static Volume operator *(Duration duration, VolumeFlow volumeFlow)
+        {
+            return Volume.FromCubicMeters(volumeFlow.CubicMetersPerSecond * duration.Seconds);
+        }
 #endif
 
         /// <summary>

UnitsNet/CustomCode/Quantities/Volume.extra.cs

@@ -19,6 +19,8 @@
 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 // THE SOFTWARE.
 
+using System;
+
 namespace UnitsNet
 {
     // Windows Runtime Component has constraints on public types: https://msdn.microsoft.com/en-us/library/br230301.aspx#Declaring types in Windows Runtime Components
@@ -41,6 +43,21 @@ public partial struct Volume
         {
             return Length.FromMeters(volume.CubicMeters / area.SquareMeters);
         }
+
+        public static VolumeFlow operator /(Volume volume, Duration duration)
+        {
+            return VolumeFlow.FromCubicMetersPerSecond(volume.CubicMeters / duration.Seconds);
+        }
+
+        public static VolumeFlow operator /(Volume volume, TimeSpan timeSpan)
+        {
+            return VolumeFlow.FromCubicMetersPerSecond(volume.CubicMeters / timeSpan.Seconds);
+        }
+
+        public static TimeSpan operator /(Volume volume, VolumeFlow volumeFlow)
+        {
+            return TimeSpan.FromSeconds(volume.CubicMeters / volumeFlow.CubicMetersPerSecond);
+        }
 #endif
     }
 }

UnitsNet/CustomCode/Quantities/VolumeFlow.extra.cs

@@ -0,0 +1,48 @@
+// Copyright (c) 2013 Andreas Gullberg Larsen (andreas.larsen84@gmail.com).
+// https://github.com/angularsen/UnitsNet
+// 
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+// 
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+// 
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
+using System;
+
+namespace UnitsNet
+{
+    // Windows Runtime Component has constraints on public types: https://msdn.microsoft.com/en-us/library/br230301.aspx#Declaring types in Windows Runtime Components
+    // Public structures can't have any members other than public fields, and those fields must be value types or strings.
+    // Public classes must be sealed (NotInheritable in Visual Basic). If your programming model requires polymorphism, you can create a public interface and implement that interface on the classes that must be polymorphic.
+#if WINDOWS_UWP
+    public sealed partial class VolumeFlow
+#else
+    public partial struct VolumeFlow
+#endif
+    {
+        // Windows Runtime Component does not allow operator overloads: https://msdn.microsoft.com/en-us/library/br230301.aspx
+#if !WINDOWS_UWP
+        public static Volume operator *(VolumeFlow volumeFlow, TimeSpan timeSpan)
+        {
+            return Volume.FromCubicMeters(volumeFlow.CubicMetersPerSecond * timeSpan.Seconds);
+        }
+
+        public static Volume operator *(VolumeFlow volumeFlow, Duration duration)
+        {
+            return Volume.FromCubicMeters(volumeFlow.CubicMetersPerSecond * duration.Seconds);
+        }
+#endif
+    }
+}