/// <summary>
/// Matches all results from the specified <paramref name="parser"/> that equal the specified
/// <paramref name="value"/>.
/// </summary>
/// <typeparam name="TSource">The type of the source elements.</typeparam>
/// <typeparam name="TResult">The type of the elements that are generated from parsing the source elements.</typeparam>
/// <param name="parser">The parser from which matches equivalent to the specified <paramref name="value"/> will be yielded.</param>
/// <param name="value">The value to be compared to matches for equality.</param>
/// <returns>A parser that matches only those results from the specified <paramref name="parser"/> that equal
/// the specified <paramref name="value"/>.</returns>
public static IObservableParser <TSource, TResult> Of <TSource, TResult>(
this IObservableParser <TSource, TResult> parser,
TResult value)
{
Contract.Requires(parser != null);
Contract.Ensures(Contract.Result <IObservableParser <TSource, TResult> >() != null);
return(parser.Of(value, EqualityComparer <TResult> .Default));
}