public bool Equals(T x, T y)
{
var boiler = EqualityHelper.BoilerEquality(x, y);
if (boiler.IsSome)
{
return(boiler.Value);
}
return(EqualityFunction(x, y));
}
/// <summary>
/// Returns true if this sequence is equal to the other sequence, using an optional value equality comparer.
/// </summary>
/// <param name="other"></param>
/// <param name="eq"></param>
/// <returns></returns>
public virtual bool SequenceEquals(IEnumerable <TElem> other, IEqualityComparer <TElem> eq = null)
{
other.CheckNotNull("other");
TList list = other as TList;
if (list != null)
{
return(SequenceEquals(list, eq));
}
return(EqualityHelper.SeqEquals(this, other, eq));
}
/// <summary>
/// Determines structural equality between the sequential collections.
/// </summary>
/// <param name="a">The first collection</param>
/// <param name="b">The second collection.</param>
/// <returns>
/// Whether the two collections are equal.
/// </returns>
public static bool operator ==(AbstractSequential <TElem, TList> a, AbstractSequential <TElem, TList> b)
{
var boiler = EqualityHelper.BoilerEquality(a, b);
if (boiler.IsSome)
{
return(boiler.Value);
}
return
(a.Equals(b));
}
/// <summary>
/// Returns an equality comparer for sequences, determining equality sequentially.
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="eq">Optionally, an equality comparer for the elements. Otherwise, the default equality comparer is used.</param>
/// <returns></returns>
public static IEqualityComparer <IEnumerable <T> > SequenceEquality <T>(IEqualityComparer <T> eq = null)
{
return(CreateEqComparer <IEnumerable <T> >((x, y) => EqualityHelper.SeqEquals(x, y, eq),
x => EqualityHelper.SeqHashCode(x, eq)));
}
/// <summary>
/// Returns a lexicographic sequence comparer, which compares each element according to its position, from first to
/// last.
/// </summary>
/// <typeparam name="T">The type of element being compared. Must be IComparable[T].</typeparam>
/// <returns></returns>
public static IComparer <IEnumerable <T> > LexSequenceComparer <T>()
where T : IComparable <T>
{
return(CreateComparer <IEnumerable <T> >((x, y) => EqualityHelper.SeqCompareLex(x, y)));
}
/// <summary>
/// Returns a lexicographic sequence comparer, which compares each element according to its position, from first to
/// last.
/// </summary>
/// <param name="comparer">The comparer used to compare each element of the sequence.</param>
/// <returns></returns>
public static IComparer <IEnumerable <T> > LexSequenceComparer <T>(IComparer <T> comparer)
{
return(CreateComparer <IEnumerable <T> >((x, y) => EqualityHelper.SeqCompareLex(x, y, comparer)));
}
/// <summary>
/// Determines whether this sequence is bigger than the other using number-like comparison (length first, then
/// lexicographically).
/// </summary>
/// <typeparam name="T">The type of value.</typeparam>
/// <param name="first">The first sequence, which is compared to the second sequence.</param>
/// <param name="second">The second sequence.</param>
/// <returns></returns>
public static int NumCompare <T>(this IEnumerable <T> first, IEnumerable <T> second)
where T : IComparable <T>
{
return(EqualityHelper.SeqCompareNum(first, second));
}
/// <summary>
/// Determines whether this sequence is bigger than the other using number-like comparison (length first, then
/// lexicographically).
/// </summary>
/// <typeparam name="T">The type of value.</typeparam>
/// <param name="first">The first sequence, which is compared to the second sequence</param>
/// <param name="second">The second sequence.</param>
/// <param name="comparer">The comparer.</param>
/// <returns></returns>
public static int NumCompare <T>(this IEnumerable <T> first, IEnumerable <T> second, IComparer <T> comparer)
{
return(EqualityHelper.SeqCompareNum(first, second, comparer));
}
/// <summary>
/// Determines whether this sequence is bigger than the other using lexicographic comparison.
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="self"></param>
/// <param name="other"></param>
/// <returns></returns>
public static int LexCompare <T>(this IEnumerable <T> self, IEnumerable <T> other)
where T : IComparable <T>
{
return(EqualityHelper.SeqCompareLex(self, other));
}
/// <summary>
/// Determines whether this sequence is bigger than the other using a lexicographic comparison (comparing each element
/// based on its position, from first to last).
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="self"></param>
/// <param name="other"></param>
/// <param name="comparer"></param>
/// <returns></returns>
public static int LexCompare <T>(this IEnumerable <T> self, IEnumerable <T> other, IComparer <T> comparer)
{
return(EqualityHelper.SeqCompareLex(self, other, comparer));
}
/// <summary>
/// Determines equality between sequences of key-value pairs. That is, they must have the same key-value pairs, but the
/// multiplicity of each key-value pair doesn't matter.
/// </summary>
/// <typeparam name="TKey">The type of key.</typeparam>
/// <typeparam name="TValue">The type of the value.</typeparam>
/// <param name="self">The first sequence of key-value pairs.</param>
/// <param name="other">The second sequence of key-value pairs.</param>
/// <param name="vEq">The equality comparer used to compare the values..</param>
/// <returns></returns>
public static bool MapEquals <TKey, TValue>(this IEnumerable <KeyValuePair <TKey, TValue> > self,
IEnumerable <KeyValuePair <TKey, TValue> > other, IEqualityComparer <TValue> vEq = null)
{
return(EqualityHelper.MapEquals(self, other, vEq));
}
/// <summary>
/// Determines set equality between sequences. That is, they must contain the same elements, but the multiplicity of
/// each element doesn't matter.
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="self">The self.</param>
/// <param name="other">The other.</param>
/// <param name="eq">Optionally, the equality comparer used for the values. If not specified, the default equality comparer is used.</param>
/// <returns></returns>
public static bool SetEquals <T>(this IEnumerable <T> self, IEnumerable <T> other, IEqualityComparer <T> eq = null)
{
return(EqualityHelper.SetEquals(self, other, eq));
}
/// <summary>
/// Computes a hash code for a sequence.
/// </summary>
/// <typeparam name="T">The type of value.</typeparam>
/// <param name="self">The sequence for which to compute the hash code.</param>
/// <param name="eq">The equality comparer used to generate the hash of each element. If not specified, default equality comparer is used.</param>
/// <returns></returns>
public static int CompuateSeqHashCode <T>(this IEnumerable <T> self, IEqualityComparer <T> eq = null)
{
return(EqualityHelper.SeqHashCode(self, eq));
}
/// <summary>
/// Override this to provide an efficient implementation for the operation.
/// </summary>
/// <param name="other"></param>
/// <param name="eq"></param>
/// <returns></returns>
protected virtual bool SequenceEquals(TList other, IEqualityComparer <TElem> eq = null)
{
other.CheckNotNull("other");
return(EqualityHelper.SeqEquals(this, other, eq));
}
