Optional parameters

[Bv202]

Hi,

Does C++ have something like optional parameters? I've Googled it and it has a lot of results, but nothing that really answers how to use it in an easy example :S

Thanks

[mcleano]

Can you elaborate? Perhaps state the problem you have that would need optional parameters?

[Bv202]

I actually don't have an example. I know I've seen this in another language (I believe it was VB .NET) and it just came up in my mind.

[Disch]

The closest thing C++ has to optional parameters are:
- function overloading:

void func( int required );
void func( int required, int optional );

- default parameters:

void func( int required, int optional = 0 );

- variable argument lists:

void func( int required, ... );

Note the 3rd option is not typesafe and is a huge pain to work into code safely

[Bv202]

Thank you Disch =)

[jsmith]

Basically ellipsis is useless in C++ and should be avoided. Either of the first two ways is fine.