Operator overloading on class templates

Question

I\'m having some problems defining some operator overloads for template classes. Let\'s take this hypothetical class for example.

template 
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Answer 1

This helped me with the exact same problem.

Solution:

1. Forward declare the friend function before the definition of the class itself. For example:

      template class MyClass;  // pre-declare the template class itself
      template std::ostream& operator<< (std::ostream& o, const MyClass & x);
   

2. Declare your friend function in your class with "<>" appended to the function name.

      friend std::ostream& operator<< <> (std::ostream& o, const Foo& x);