Unknown data type

[mmgh]

Hello,

I have defined a new data type in MyClass, but the compiler complains when I use that data type for the getter function definition.

This is my code

  #include <vector>

  template<class T>
  class MyClass 
  {
    using data_t = std::vector<T>;
    private:
    data_t  p_;
    data_t  d_;

    public:
    MyClass();
    ~MyClass();
    void setP(data_t p);
    data_t getP();
  };

  template<class T>
  void MyClass<T>::setP(data_t p)
  {
     P_ = P;
  }

  template<class T>
  data_t MyClass<T>::getP() /*Compiler gives error that data_t is unknown here
  {
     return p_;
  } */

I also defined data_t in the file scope, but it did not help.
Any comments?

Thanks,
mmgh

[Peter87]

You need to fully specify the scope of the return type, the same way as you would have to do if you used it from a function that's not part of the class.

template<class T>
typename MyClass<T>::data_t MyClass<T>::getP() 
{
	return p_;
}

[coder777]

Since a return type is outside the class you need to add the scope:

typename MyClass<T>::data_t MyClass<T>::getP()

Note that typename is also required because well 'MyClass<T>' is a dependent scope.

[mmgh]

Thank you so much.
The problem is solved.