/// <inheritdoc />
protected override int DoGetHashCode(IEnumerable <T> obj)
{
var ret = CommutativeHashCombiner.Create();
foreach (var item in obj)
{
ret.Combine(Source.GetHashCode(item !));
}
return(ret.HashCode);
}
public void CommutativeHashCombiner_IsCommutative()
{
// This unit test assumes the GetHashCode of these two objects are different.
int value1 = 5;
int value2 = 7;
Assert.NotEqual(value1.GetHashCode(), value2.GetHashCode());
var hash1 = CommutativeHashCombiner.Create();
hash1.Combine(value1);
hash1.Combine(value2);
var result1 = hash1.HashCode;
var hash2 = CommutativeHashCombiner.Create();
hash2.Combine(value2);
hash2.Combine(value1);
var result2 = hash2.HashCode;
Assert.Equal(result1, result2);
}