public static T Max <T>([NotNull] this IComparer <T> comparer, T x, T y)
{
comparer.CheckArgumentNull(nameof(comparer));
int cmp = comparer.Compare(x, y);
return(cmp >= 0 ? x : y);
}
public static TSource Min <TSource>(
[NotNull] this IEnumerable <TSource> source,
[NotNull] IComparer <TSource> comparer)
{
source.CheckArgumentNull(nameof(source));
comparer.CheckArgumentNull(nameof(comparer));
return(source.Extreme(comparer, -1));
}
public static IComparer <T> ThenBy <T, TKey>(
[NotNull] this IComparer <T> comparer,
[NotNull] Func <T, TKey> keySelector,
IComparer <TKey>?keyComparer = null)
{
comparer.CheckArgumentNull(nameof(comparer));
return(comparer.ChainWith(By(keySelector, keyComparer)));
}
public static IComparer <T> ChainWith <T>(
[NotNull] this IComparer <T> comparer,
[NotNull] IComparer <T> nextComparer)
{
comparer.CheckArgumentNull(nameof(comparer));
nextComparer.CheckArgumentNull(nameof(nextComparer));
var comparers = GetComparers(comparer);
var nextComparers = GetComparers(nextComparer);
return(new ChainedComparer <T>(comparers.Concat(nextComparers).ToArray()));
}
public static IComparer <T> Reverse <T>([NotNull] this IComparer <T> comparer)
{
comparer.CheckArgumentNull(nameof(comparer));
return(new ReverseComparer <T>(comparer));
}