Operator + compiles on Unix, but not Vis C++

[noleander]

I've got some source code that includes vector and matrix classes (or
structures) that have addition and subtraction operators. This source code
compiles on five different Unix platforms, but I'm getting a compiler error
on Vis C++. The error is:

"binary operator + has too many parameters".

Here is the offending code fragment:
class ground_point_struct {
.. . .
ground_point_struct // return value
operator +( // addition operator
ground_point_struct &gp1, // ground point
ground_point_struct &gp2 ) // ground point to subtract
{ .... }

Does anyone have any idea why Vis C++ wont compile this addition method?

[Gabest]

Try making it a "friend" function.

[Carl Daniel [VC++ MVP]]

noleander wrote:

I've got some source code that includes vector and matrix classes (or
structures) that have addition and subtraction operators. This
source code compiles on five different Unix platforms, but I'm
getting a compiler error on Vis C++. The error is:

"binary operator + has too many parameters".

Here is the offending code fragment:
class ground_point_struct {
. . .
ground_point_struct // return value
operator +( // addition operator
ground_point_struct &gp1, // ground point
ground_point_struct &gp2 ) // ground point to subtract
{ .... }

Does anyone have any idea why Vis C++ wont compile this addition
method?

Because it's not legal C++ code.

operator+ can be either a member function or a namespace-scoped function.
As a member function, it must have a single parameter (*this is the other
parameter). As a namespace-scoped function it must have two parameters.

Move the function declaration outside the class and make it a friend of the
class if necessary (if it needs to access non-public members of the class).

-cd

[Arnaud Debaene]

noleander wrote:

I've got some source code that includes vector and matrix classes (or
structures) that have addition and subtraction operators. This
source code compiles on five different Unix platforms, but I'm
getting a compiler error on Vis C++. The error is:

"binary operator + has too many parameters".

Here is the offending code fragment:
class ground_point_struct {
. . .
ground_point_struct // return value
operator +( // addition operator
ground_point_struct &gp1, // ground point
ground_point_struct &gp2 ) // ground point to subtract
{ .... }

How would you call this operator since it has 3 arguments (gp1, gp2 an
implicit this, since the operator is a member function) ??

Arnaud
MVP - VC