c++/1007: Bogus error message resolving overloaded operators

[Peter.Bienstman@rug.ac.be]

>Number:         1007
>Category:       c++
>Synopsis:       Bogus error message resolving overloaded operators
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    unassigned
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Thu Dec 07 06:56:00 PST 2000
>Closed-Date:
>Last-Modified:
>Originator:     Peter Bienstman
>Release:        GCC 2.97 20001128
>Organization:
>Environment:
i686-pc-linux-gnu
>Description:
When compiling the attached incorrect source file, g++ gives the following bogus error:

/tmp/@22251.7.cc: In function `void f(Complex*)':
/tmp/@22251.7.cc:28: no match for `std::complex& = Coord' operator
/usr/local/include/g++-v3/bits/std_complex.h:681: candidates are: 
std::complex& std::complex::operator=(double)
/usr/local/include/g++-v3/bits/std_complex.h:662: 
std::complex& std::complex::operator=(const std::complex&)

Of course, the class Coord should not be involved in this. Removing the inline Coord operator* operator gives the correct error:

/tmp/@22315.7.cc: In function `void f(Complex*)':
/tmp/@22315.7.cc:27: no match for `int& * Complex&' operator
>How-To-Repeat:
Compile this source file:

#include <complex>

using namespace std;

typedef complex<double> Complex;

class Coord
{  
  public:

    Coord(const Complex& x_ = 0.0,
          const Complex& y_ = 0.0,
          const Complex& z_ = 0.0)
      : x(x_), y(y_), z(z_) {}
       
    Complex x;
    Complex y;
    Complex z;
};

inline Coord operator*(const Complex& c, const Coord& co) {return co;}

void f(Complex* R)
{
  Complex a(1,0);
  int sign = 1;
  
  *R = sign * a;
}
>Fix:

>Release-Note:
>Audit-Trail:
>Unformatted: