Overloading template function in cpp

Question

I have this hpp

namespace A
{
    template<class T>
    class MyC
    {
    public:
        T a;
    };

    template<class T>
    void F(T r);
}

and this cpp

template<>
void A::F<double>(double r)
{
    r;
}

template<>
void A::F<int>(int r)
{
    r;
}

template<class T>
void A::F<A::MyC<T>>(A::MyC<T> r)
{
    r;
}
template void A::F<A::MyC<int>>(A::MyC<int>);
template void A::F<A::MyC<double>>(A::MyC<double>);

but compiler says "unable to match function definition to an existing declaration" about F.

What's wrong with this code?

yep, other overloads are okay. bad things happens only when we using template type like parameter for template function — brachistochron, Dec 13 '13 at 11:49
You're not overloading in the cpp, but explicitly specializing and explicitly instantiating. `F`, being a function template, *is* a set of overloaded functions. — dyp, Dec 13 '13 at 12:25
"Wrong" is that partial template specialization of a function is prohibited. F should be a class/struct for this to work. And yes, this is not overload but template specialization. You may want to look at [this question](http://stackoverflow.com/questions/8061456/c-function-template-partial-specialization). — Abstraction, Dec 14 '13 at 09:36

score 2 · Accepted Answer · answered Dec 13 '13 at 10:52

2

Put those declarations all in namespace A { ... } and remove A::. On the other hand, function template partial specialization is not allowed and this will make error:

template<class T>
void F<MyC<T>>(MyC<T> r)
{
    ...
}

answered Dec 13 '13 at 10:52

masoud

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Is there some way to make this overloads without changing hpp file? – brachistochron Dec 13 '13 at 11:14

Overloading template function in cpp

1 Answers1