[nem-en] Extension methods

[Alejandro Serrano]

Thanks for telling it. As of today, System.Query has
been merged into the mcs/class Mono tree, and all
Sequence.cs files have been merged too. Please check
there for the latest versions.

I will correct as soon as possible the SkipWhile
method. Equals<T> just follws the spec, which tells
that objects must be compared using both Equals and
GetHashCode methods. I just followed it ;-)

Thanks,
trupill

 --- Marcin 'Qrczak' Kowalczyk <qrczak at knm.org.pl>
escribió:

> Alejandro Serrano <trupill at yahoo.es> writes:
> 
> > I attach a C# implementation of System.Query to
> start thinking about
> > query-like expressions.
> 
> Anybody has tested it? I browsed it just for
> curiosity, and found
> e.g. this in System.Query/SequencePartitioning.cs:
> 
>                
> [System.Runtime.CompilerServices.Extension]
>                 public static IEnumerable<T>
> SkipWhile<T> (
>                         IEnumerable<T> source,
>                         Func<T, bool> predicate)
>                 {
>                         if (source == null ||
> predicate == null)
>                                 throw new
> ArgumentNullException ();
>                         
>                         bool yield = false;
>                         
>                         foreach (T element in
> source) {
>                                 if (yield)
>                                         yield return
> element;
>                                 else
>                                         if
> (!predicate (element))
>                                                
> yield = true;
>                         }
>                 }
> 
> which doesn't yield the first element which doesn't
> satisfy the
> predicate, or this in
> System.Query/SequenceNotInSpec.cs:
> 
>                
> [System.Runtime.CompilerServices.Extension]
>                 private static bool Equals<T> (
>                         T first, T second)
>                 {
>                         // Mostly, values in
> Enumerable<T> 
>                         // sequences need to be
> compared using
>                         // Equals and GetHashCode
>                         
>                         if (first == null || second
> == null)
>                                 return (first ==
> null && second == null);
>                         else
>                                 return
> ((first.Equals (second) ||
>                                         
> first.GetHashCode () == second.GetHashCode ()));
>                 }
> 
> where comparing hash codes doesn't seem to make
> sense.
> 
> -- 
>    __("<         Marcin Kowalczyk
>    \__/       qrczak at knm.org.pl
>     ^^     http://qrnik.knm.org.pl/~qrczak/
> 
> _______________________________________________
> https://nemerle.org/mailman/listinfo/devel-en
> 



	
	
		
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