How to define a nested member template outside a class template?

user_284277 0
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Consider the following class template:

template <class T>
class MyClass
{
   void MyFunc();
};

template <class T>
void MyClass<T>::MyFunc()
{
  //...implementation goes here
}

I need to add another function template MyFunc2 which accepts a template argument T2 i.e.,

template <class T>
class MyClass
{
   void MyFunc();

   template <class T2>
   static void MyFunc2(T2* data);
};

template <class T>
void MyClass<T>::MyFunc()
{
  //...implementation goes here
}

template <class T, class T2>
void MyClass<T>::MyFunc2(T2* pData)  // error here
{
  //...implementation goes here
}

I am using VS 2008 compiler. I am getting the error:

error C2244: unable to match function definition to an existing declaration

What should the function's definition and declaration look like in this case?

templates c++
3 Answers

Try this one :

template <class T, class T2>
class MyClass
{
public:
    static void MyFunc2(T2* data);
};

template <class T, class T2>
void MyClass<T, T2>::MyFunc2(T2* pData)
{
    cout << "dummy " << *pData<< "\n";
}

Then

int main()
{
    cout << "Hello World!\n"; 
    MyClass<int, int> a;
    int *b = (int*)malloc(sizeof(int));
    *b = 5;
    a.MyFunc2(b);
}

Output

Hello World!
dummy 5
user_108600770
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