The following class compiles fine. Why does removing the friend keyword
to the '+' operator cause the following compile time error in VC 8:
error C2804: binary 'operator +' has too many parameters? This seems
counterintuitive to me.

class Matrix
{
     typedef float elemType;
public:
     friend Matrix operator+(const Matrix &, const Matrix &);
// ...
private:
     elemType _matrix[4][4];
};

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===================================== MODERATOR'S COMMENT:
 I am approving this message as it is a follow-up, but this appears to be off-topic for comp.std.c++ and better suited to comp.lang.c++.moderated.


===================================== END OF MODERATOR'S COMMENT
On 8 jan, 15:14, "mstampfer" <mstamp...@gmail.com> wrote:
> The following class compiles fine. Why does removing the friend keyword
> to the '+' operator cause the following compile time error in VC 8:
> error C2804: binary 'operator +' has too many parameters? This seems
> counterintuitive to me.
>
> class Matrix
> {
>      typedef float elemType;
> public:
>      friend Matrix operator+(const Matrix &, const Matrix &);
> // ...
> private:
>      elemType _matrix[4][4];
>
> };---

This declares that the free-function operator+ is a friend of class
Matrix.
operator+ declared as a free function takes two parameters.

If you take the friend keyword you are declaring the operator+ member
function of class Matrix.
operator+ declared as a member function takes one parameter.

--
 Pedro Lamar   o


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