template memberfunctions

[Uwe Mayer]

Hi,

I'm trying to create a template memberfunction in a non-template class,
using gcc under Linux:

plot.h:

namespace ml {
class Axes {
public:
Axes(double id);
~Axes();

template <typename T> LinePlot& plot(T *x, T *y, char *options=0);
};
}

A function definition (outside the namespace ml, but still inside the header
file works, i.e.

template <typename T> ml::LinePlot& ml::Axes:lot(T *x, T *y, char
*options) {
fprintf(stderr, "test\n");
}

If I move the same definition from the .h to the .cpp file I get a linking
error:

undefined reference to `ml::LinePlot&
ml::Axes:lot<gsl_vector>(gsl_vector*, gsl_vector*, char*)'

Any ideas whats going on here?

Thanks in advance
Ciao
Uwe

 

[Victor Bazarov]

Hi,

I'm trying to create a template memberfunction in a non-template
class, using gcc under Linux:

plot.h:

namespace ml {
class Axes {
public:
Axes(double id);
~Axes();

template <typename T> LinePlot& plot(T *x, T *y, char *options=0);
};
}

A function definition (outside the namespace ml, but still inside the
header file works, i.e.

template <typename T> ml::LinePlot& ml::Axes:lot(T *x, T *y, char
*options) {
fprintf(stderr, "test\n");
}

If I move the same definition from the .h to the .cpp file I get a
linking error:

undefined reference to `ml::LinePlot&
ml::Axes:lot<gsl_vector>(gsl_vector*, gsl_vector*, char*)'

Any ideas whats going on here?

FAQ 35.15

V

 

[Uwe Mayer]

FAQ 35.15

V

Thanks!

Ciao
Uwe