Re: Compilation failure, template problems

[Michael Goffioul]

I think I narrowed down the problem to the following
piece of code, which does not compile under MSVC.
If I remove the 'g' overloads to only keep the 'double'
one, then it compiles fine.

Any chance to get a workaround?

Michael.

#include <iostream>

template <class T>
class A
{
  public:
      typedef T element_type;
};

template <class T, typename T::element_type fun(typename T::element_type)>
void f()
{
  std::cout << "f<T>" << std::endl;
}

double g(double x) { std::cout << "g(double)" << std::endl; return x; }
int g(int x) { std::cout << "g(int)" << std::endl; }
float g(float x) { std::cout << "g(float)" << std::endl; }

int main(int argc, char **argv)
{
  f<A<double>,g>();
  return 0;
}


On Sat, Nov 14, 2009 at 3:31 PM, Michael Goffioul
<address@hidden> wrote:
> Hi,
>
> Using recent octave archive, MSVC fails to compile liboctave due
> to a template problems. The error is the following:
>
> ../../liboctave/CNDArray.cc(763) : error C2563: mismatch in formal
> parameter list
> ../../liboctave/CNDArray.cc(763) : error C2563: mismatch in formal
> parameter list
> ../../liboctave/CNDArray.cc(763) : error C2440: 'specialization' :
> cannot convert from 'overloaded-function' to 'double (__cdecl *const
> )(Complex)'
>        None of the functions with this name in scope match the target type
> ../../liboctave/CNDArray.cc(763) : error C2973: 'do_mx_unary_map' :
> invalid template argument 'overloaded-function'
>        c:\sources\playground\c\octave-graphics-hg\liboctave\mx-inlines.cc(264)
> : see declaration of 'do_mx_unary_map'
> ../../liboctave/CNDArray.cc(763) : error C2668: 'do_mx_unary_map' :
> ambiguous call to overloaded function
>        
> c:\sources\playground\c\octave-graphics-hg\liboctave\mx-inlines.cc(271):
> could be 'RNDA do_mx_unary_map<NDArray,ComplexNDArray,double
> std::abs<double>(const std::complex<double> &)>(const XNDA &)'
>        with
>        [
>            RNDA=NDArray,
>            XNDA=ComplexNDArray
>        ]
>        
> c:\sources\playground\c\octave-graphics-hg\liboctave\mx-inlines.cc(264):
> or       'RNDA do_mx_unary_map<NDArray,ComplexNDArray,& abs>(const
> XNDA &)'
>        with
>        [
>            RNDA=NDArray,
>            XNDA=ComplexNDArray
>        ]
>        while trying to match the argument list '(const ComplexNDArray)'
>
> Any idea how to work around the problem? This part of the code seems
> pretty recent.
>
> Michael.
>