From 38899ee55e5b8a558ee91349ab2042d26ff7a961 Mon Sep 17 00:00:00 2001
From: MarkusSintonen <markus.sintonen@gmail.com>
Date: Tue, 30 Jun 2015 21:42:29 +0300
Subject: [PATCH] Add HashSet<T> ctors with capacity

Adds ctors to HashSet that accept a capacity.

New tests are not included due to System.Collections.dll being
a partial facade, and the repo not currently having the infrastructure
to enable adding tests for new surface area in partial facades.
---
 .../src/System/Collections/Generic/HashSet.cs | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/src/System.Collections/src/System/Collections/Generic/HashSet.cs b/src/System.Collections/src/System/Collections/Generic/HashSet.cs
index e08c358589b9..17c83890fffc 100644
--- a/src/System.Collections/src/System/Collections/Generic/HashSet.cs
+++ b/src/System.Collections/src/System/Collections/Generic/HashSet.cs
@@ -92,6 +92,10 @@ public HashSet(IEqualityComparer<T> comparer)
             _version = 0;
         }
 
+        public HashSet(int capacity)
+            : this(capacity, EqualityComparer<T>.Default)
+        { }
+
         public HashSet(IEnumerable<T> collection)
             : this(collection, EqualityComparer<T>.Default)
         { }
@@ -131,6 +135,21 @@ public HashSet(IEnumerable<T> collection, IEqualityComparer<T> comparer)
             }
         }
 
+        public HashSet(int capacity, IEqualityComparer<T> comparer)
+            : this(comparer)
+        {
+            if (capacity < 0)
+            {
+                throw new ArgumentOutOfRangeException("capacity");
+            }
+            Contract.EndContractBlock();
+
+            if (capacity > 0)
+            {
+                Initialize(capacity);
+            }
+        }
+
         #endregion
 
         #region ICollection<T> methods