Re: Templates functions as template parameters
tygro wrote:
Hi,
I would like to do something like this:
class Type
{
public:
template <template<typename> class Fun>
void applyOnType(Fun f, void* data)
{
switch(type) {
What's "type"? It's not defined here.
case 0:
f<int>(data);
break;
case 1:
f<short>(data);
break;
}
};
Then I could call:
template <typename T> void myFunction(T* data) { }
DataType dt;
dt.applyOnType(myFunction, data);
But it doesn't work because I guess it is not possible to pass a
template function in argument to a function.
Furthermore, because of the template-template, it seems that Fun must
be functor.
A function is a functor. No big deal.
Do you see a way to write something as flexible as this but which
could compile?
Flexible? Looks like too flexible.
My only working solution was this:
class TypeFunc
{
public:
template<typename T> void operator()() {}
};
void onDataType(TypeFunc& f, void* data)
{
switch(..) {
...
f.operator()<int>();
...
}
}
I don't think it's easy to use. I also have a macro based solution, but I
would prefer something 100% template.
Try looking in the FAQ first. Then if you have some questions
remainging unanswered, come back and ask again. Start with 5.8,
then move onto section 35 (templates).
Also, perhaps you could explain what you're trying to accomplish
with design like yours.
V
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