Re: How to make a template class-friend function

From:
Victor Bazarov <v.bazarov@comcast.invalid>
Newsgroups:
comp.lang.c++
Date:
Sat, 17 Jan 2015 08:19:23 -0500
Message-ID:
<m9dng7$fgg$1@dont-email.me>
On 1/17/2015 7:54 AM, JiiPee wrote:

So I have this global function which I want to be a friend of a class. I
tried all kind of combinations after googling but none worked so far. If
anybody remembers how to do this would be nice, thanks. Here is the code:

// forwards declaring things for the template function - from google...
template <typename T>
class Vector2D;

template <typename T>
Vector2D<T> operator * (const T& pointXY, const Vector2D<T>& point);

// my class
template <typename T>
class Vector2D : public Coordinate2D<T>
{
public:
    // this is what I tried last time.. does not work
    friend Vector2D<T> operator * (const T& pointXY, const Vector2D<T>&
point);
};

// the global function implementation:
template <typename T>
inline Vector2D<T> operator * (const T& pointXY, const Vector2D<T> &
point)
{
     return point * pointXY;
}


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Victor
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