Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System.ServiceModel/System/ServiceModel/Channels/SequenceRange.cs

@@ -0,0 +1,95 @@
+//------------------------------------------------------------
+// Copyright (c) Microsoft Corporation.  All rights reserved.
+//------------------------------------------------------------
+namespace System.ServiceModel.Channels
+{
+    using System.Globalization;
+    using System.Runtime;
+
+    struct SequenceRange
+    {
+        // fields
+        Int64 lower;
+        Int64 upper;
+
+        // constructors
+        public SequenceRange(Int64 number)
+            : this(number, number)
+        {
+        }
+
+        public SequenceRange(Int64 lower, Int64 upper)
+        {
+            if (lower < 0)
+            {
+                throw Fx.AssertAndThrow("Argument lower cannot be negative.");
+            }
+
+            if (lower > upper)
+            {
+                throw Fx.AssertAndThrow("Argument upper cannot be less than argument lower.");
+            }
+
+            this.lower = lower;
+            this.upper = upper;
+        }
+
+        // properties
+        public Int64 Lower
+        {
+            get { return this.lower; }
+        }
+
+        public Int64 Upper
+        {
+            get { return this.upper; }
+        }
+
+        public static bool operator ==(SequenceRange a, SequenceRange b)
+        {
+            return (a.lower == b.lower) && (a.upper == b.upper);
+        }
+
+        public static bool operator !=(SequenceRange a, SequenceRange b)
+        {
+            return !(a == b);
+        }
+
+        public bool Contains(Int64 number)
+        {
+            return (number >= this.lower && number <= this.upper);
+        }
+
+        public bool Contains(SequenceRange range)
+        {
+            return (range.Lower >= this.lower && range.Upper <= this.upper);
+        }
+
+        public override bool Equals(object obj)
+        {
+            if (obj == null)
+            {
+                return false;
+            }
+            else if (obj is SequenceRange)
+            {
+                return this == (SequenceRange)obj;
+            }
+            else
+            {
+                return false;
+            }
+        }
+
+        public override int GetHashCode()
+        {
+            Int64 hashCode = (this.upper ^ (this.upper - this.lower));
+            return (int)((hashCode << 32) ^ (hashCode >> 32));
+        }
+
+        public override string ToString()
+        {
+            return string.Format(CultureInfo.InvariantCulture, "{0}-{1}", this.lower, this.upper);
+        }
+    }
+}