Question

I can’t seem to find the right syntax to specialize this template :

template <class Object, class Var, class Invert, class Step = Var, unsigned int FIXED = IW_GEOM_POINT>
class TSin : public BasicTween<Object, Var> {...

I want to keep <Object> as a template parameter but specialize all other parameters. I am trying it like this :

    template <class Object>
class TSin<Object, CIwVec2, int, CIwVec2, IW_GEOM_POINT> {...

This gives errors.

Please can someone provide the right syntax to specialize the template and the syntax to instantiate the specialized version?

Answer 1

The error is you’re redefining class TSin. I don’t think you can do that.

What you can do is declare the generic template and specialize the definitions of the class:

template <class Object, class Var, class Invert, class Step = Var, 
    unsigned int FIXED = IW_GEOM_POINT>
    class TSin;
template <class Object>
    class TSin<Object, CIwVec2, int, CIwVec2, IW_GEOM_POINT> {...

or specialize the definitions of members of the class:

template <class Object>
void TSin<Object, CIwVec2, int, CIwVec2, IW_GEOM_POINT>::Foo(...) {...

or declare a subclass:

template <class Object, class Var, class Invert, class Step = Var, 
    unsigned int FIXED = IW_GEOM_POINT>
    class TSin : public BasicTween<Object, Var> {...
template <class Object>
    class SpecialTSin::public TSin<Object, CIwVec2, int, CIwVec2, IW_GEOM_POINT>
{...

I think the latter option is the best.