Re: How to overload == for System.Double

I am curious why you do not like extension methods. One can abuse of
this feature quite easily, but that is true for about any other
language features... Any reason in particular ?

Sébastien
www.sebastienlorion.com

On 2/1/07, Peter Ritchie <[email protected]> wrote:
> I was under the impression that the scope of extension methods did not
> include extending operators.  The C# 3.0 spec. provides no detail for this
> either way.
>
> If it does, that's nother reason not to like extension methods....
>
> On Thu, 1 Feb 2007 16:21:11 -0500, Shawn Wildermuth
> <[email protected]> wrote:
>
> ><sarcasm>
> >   You should be able to do this with C# 3.0 Extension Methods (or
> whatever
> >they are called).  Of course, it's an impossibly bad idea so don't
> try...but
> >luckily we'll be able to do it soon.
> ></sarcasm>
> >
> >
> >Thanks,
> >
> >Shawn Wildermuth
> >Wildermuth Consulting Services, LLC
> >http://wildermuthconsulting.com
> >http://adoguy.com
> >Microsoft MVP (C#), MCSD.NET, Author and Speaker
> >
> >-----Original Message-----
> >From: Discussion relating to the specifics of the C# and Managed C++
> >languages [mailto:[email protected]] On Behalf Of Eames,
> Andrew
> >Sent: Thursday, February 01, 2007 4:00 PM
> >To: [email protected]
> >Subject: Re: [DOTNET-CX] How to overload == for System.Double
> >
> > Even if you could do this it is probably a really bad idea. Instead I
> >suggest you write a separate function
> >
> >Static bool Equallish(doubl lhs,double rhs)
> >
> >Andrew
> >
> >-----Original Message-----
> >From: Discussion relating to the specifics of the C# and Managed C++
> >languages [mailto:[email protected]] On Behalf Of Jack Brown
> >Sent: Thursday, February 01, 2007 3:33 PM
> >To: [email protected]
> >Subject: [DOTNET-CX] How to overload == for System.Double
> >
> >Is it possible?
> >
> >If I put these in a project:
> >
> >                public static bool operator ==( double lhs, double rhs )
> >                {
> >                }
> >                public static bool operator !=( double lhs, double rhs )
> >                {
> >                }
> >
> >I get a compiler error: One of the parameters of a binary operator must
> >be the containing type
> >
> >I get this since the overloads are inside a class so they need to have
> >parameters that are of the containing class type. My problem is that I
> >can't put the operator overloads outside a class.
> >
> >The reason I'm doing this is that I want to avoid the problems
> >associated with exact equality comparisons of floating point numbers. I
> >plan/wish to add a Math.Abs(lhs-rhs) <= epsilon where epsilon is some
> >suitably small value.
> >
> >Any help, or at least confirmation that I can't do what I'd like to
> >would be appreciated.
>
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-- 
Sébastien
www.sebastienlorion.com