Using variables of template class type inside another template classes

Question

How do I use variables of a template class inside other template classes? On compile, I receive the error clsC is not a template - why?

---- MyClasses.h: ----

template <typename T> class clsA {
public:
    void Foo(typename clsC<T> arg) {...}
    ...
};

template <typename T> class clsB {
public:
    std::vector<clsA<T>> a;
    ...
};

template <typename T> class clsC {
public:
    clsC(typename clsB<T> arg) {...}
    ...
};

There's been a lot of similar questions, but none which have solved my problem so far.

Ahh I didn't know you could forward declare classes (I'm coming from pure C) - Thanks — mchen
– mchen, Commented May 4, 2013 at 2:56

oohtj · Accepted Answer · 2013-05-04 02:56:00Z

3

You probably have to add clsC forward declaration.

template<class T> class clsC;

Put this line right before clsA's definition.

Also, the following line

std::vector<clsA<T>> a;

should rewrite to

std::vector< clsA<T> > a;

because of compiler misunderstands the symbol ">>".

answered May 4, 2013 at 2:56

oohtj

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