/// <summary>
/// Returns a hash code for the specified object.
/// </summary>
/// <param name="obj">The object for which to return a hash code. This object may be <c>null</c>.</param>
/// <returns>A hash code for the specified object.</returns>
protected override int DoGetHashCode(T obj)
{
unchecked
{
var ret = (int)2166136261;
ret += ComparerHelpers.GetHashCodeFromComparer(Source, obj);
ret *= 16777619;
ret += ComparerHelpers.GetHashCodeFromComparer(SecondSource, obj);
ret *= 16777619;
return(ret);
}
}
/// <summary>
/// Returns a hash code for the specified object.
/// </summary>
/// <param name="obj">The object for which to return a hash code.</param>
/// <returns>A hash code for the specified object.</returns>
protected override int DoGetHashCode(IEnumerable <T> obj)
{
Contract.Assume(obj != null);
unchecked
{
var ret = (int)2166136261;
foreach (var item in obj)
{
ret += ComparerHelpers.GetHashCodeFromComparer(Source, item);
ret *= 16777619;
}
return(ret);
}
}
/// <summary>
/// Returns a hash code for the specified object.
/// </summary>
/// <param name="obj">The object for which to return a hash code. This object may be <c>null</c>.</param>
/// <returns>A hash code for the specified object.</returns>
protected override int DoGetHashCode(T obj)
{
return(ComparerHelpers.GetHashCodeFromComparer(this.Source, obj));
}
/// <summary>
/// Initializes a new instance of the <see cref="CompoundComparer<T>"/> class.
/// </summary>
/// <param name="source">The source comparer. If this is <c>null</c>, the default comparer is used.</param>
/// <param name="secondSource">The second comparer. If this is <c>null</c>, the default comparer is used.</param>
public CompoundComparer(IComparer <T> source, IComparer <T> secondSource)
: base(source, true)
{
this.secondSource_ = ComparerHelpers.NormalizeDefault(secondSource);
}
/// <summary>
/// Initializes a new instance of the <see cref="SourceComparerBase<T, TSource>"/> class.
/// </summary>
/// <param name="source">The source comparer. If this is <c>null</c>, the default comparer is used.</param>
/// <param name="allowNulls">A value indicating whether <c>null</c> values are passed to <see cref="EqualityComparerBase{T}.DoGetHashCode"/> and <see cref="ComparerBase{T}.DoCompare"/>. If <c>false</c>, then <c>null</c> values are considered less than any non-<c>null</c> values and are not passed to <see cref="EqualityComparerBase{T}.DoGetHashCode"/> nor <see cref="ComparerBase{T}.DoCompare"/>.</param>
protected SourceComparerBase(IComparer <TSource> source, bool allowNulls)
: base(allowNulls)
{
this.source_ = ComparerHelpers.NormalizeDefault(source);
}
