Re: [Toon-members] Template Return Function

[Georg Klein]

On 9 Jan 2010, at 08:32, Gabriel Nützi wrote:

> Hello all,...
>
> I have a question which I could (with my bare knowledge about  
> templates) not solve
>
> I would like to have a TooN function which does the fallowing
>
> template < int N, typename Base >      Matrix< 6 , N , double,  
> Base>     myFunction( int a ) ;
>
> What I would like is to have as a return value a matrix which size  
> is defined in myFunction()....
> and an assignment like this some how
>
> Matrix<6,Dynamic,double>   A  = myFunction( 4 );  // Does not work,  
> can not deduce template arguments or something like that, (VB 2008)
>
> Is this possible or how should I do this with a dynamic return value  
> which size is determined by myFunction?


You'd have to specify which version of the template you want when  
calling the function, since the compiler cannot resolve overloads  
based on return value. I think the syntax may be something like

Matrix<6,Dynamic, double> A = myFunction<6,Dynamic,double>(4)