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sprite_hound

template class template constructors

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The code pretty much explains itself. How do I call a value templated class template constructor?



template<class T>
class TClass {
public:
template<int S>
explicit TClass(T foo): foo(foo) {}

private:
T foo;
};

int main(int, char*[]) {
//TClass<int> t2(1); // nope (obviously)
//TClass<int> t2<5>(1); // nope
//TClass<int> t2.template TClass<5>(1); // nope
//TClass<int> t2.template TClass<int>::TClass<5>(1); // madness (nope)
TClass<int> t2.template TClass<int>::TClass<int><5>(1); // SPARTA!!!! (nope)
// Umm?
}



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You don't. One of the many fun parts about C++. You'll need to provide an argument for template resolution to occur with constructors. Not necessarily an S, but a type-to-type argument would work as well.

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Oh. The special C++ kind of fun. ♥


template<class T>
class TClass {
public:
template<int S>
TClass(T foo, Loki::Int2Type<S>): foo(foo) {}

private:
T foo;
};

int main(int, char*[]) {
TClass<int> t(1, Loki::Int2Type<5>()); // yay (headdesk)
}





Thanks SiCrane!

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