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IEqualityComparer<T> is not covariant before .NET 4

This commit is contained in:
Sam Harwell 2013-02-27 13:47:05 -06:00
parent 104de1a1c5
commit 1fe11155d6
1 changed files with 7 additions and 6 deletions
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13
runtime/CSharp/Antlr4.Runtime.Test/TestGraphNodes.cs
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@ -1014,16 +1014,17 @@ namespace Antlr4.Runtime.Test
where TKey : class where TKey : class
{ {
public IdentityHashMap() public IdentityHashMap()
: base(IdentityEqualityComparer.Default) : base(IdentityEqualityComparer<TKey>.Default)
{ {
} }
} }
private class IdentityEqualityComparer : IEqualityComparer<object> private class IdentityEqualityComparer<T> : IEqualityComparer<T>
where T : class
{ {
private static readonly IdentityEqualityComparer _default = new IdentityEqualityComparer(); private static readonly IdentityEqualityComparer<T> _default = new IdentityEqualityComparer<T>();
public static IdentityEqualityComparer Default public static IdentityEqualityComparer<T> Default
{ {
get get
{ {
@ -1031,12 +1032,12 @@ namespace Antlr4.Runtime.Test
} }
} }
public new bool Equals(object x, object y) public bool Equals(T x, T y)
{ {
return x == y; return x == y;
} }
public int GetHashCode(object obj) public int GetHashCode(T obj)
{ {
return RuntimeHelpers.GetHashCode(obj); return RuntimeHelpers.GetHashCode(obj);
} }