Quote:Original post by the_edd
I don't know what you mean by "passing a pointer". There are no pointers involved in the code I posted. All functions are class-scope static.

I was thinking of the other possibility of adding a template parameter, a pointer to a function. I was not referring to your code, but talking of the benefit of using it.

Quote:
By default std::sqrt is used (as it's called by the primary template). It does exactly what you want.

I understand that, but what if the functions I want to use, use the same type as the primary template?

[Edited by - johnstanp on July 9, 2008 4:44:50 PM]

The template suggestion I made above was before the OP edited the post. Templated calculation of values doesn't apply in this case.

The simplest solution still remains using templates and default arguments as was mentioned before:


This has the added benefit of end-user class remaining the same syntax-wise, so there's no need to change the existing code.

Well, the_edd, I was wondering if bignum could be a typedef, an alias of a primary type, hence removing the need of using a custom type, to select, for the same primary type, a different implementation( algorithm ).

Quote:Original post by the_edd

Quote:Original post by johnstanp
Well, the_edd, I was wondering if bignum could be a typedef, an alias of a primary type, hence removing the need of using a custom type, to select, for the same primary type, a different implementation( algorithm ).

Ah I see. No, I intended you to think of it as a user defined class.

Okay.
I could wrapp the primary types in my own classes, but I would have to overload the usual operators for those primary types.
Well, I took the most painful path, that is to say, adding a template parameter to the definition of my Vector3 class and to all of the classes that have a vector3 member object...



Of course, MathLib must define static functions( for example SQRT ): I prefer doing it that way, to avoid storing an instance of MathLib, for every Vector3 instanciated...And ah, I had to overload "operator=" and "Vector3( const Vector3& )" to allow "type conversion" between two Vector3 using different "Math Libraries".

[edit] That's the solution given by lexs. So thank you lexs. And thank you the_edd for your disponibility.[/edit]