Re: g++; operator==

Re: g++; operator==

[Richard Guenther]

First of all, this mailinglist only tracks bugzilla
(http://gcc.gnu.org/bugzilla) activity, so getting help
this way is going to fail.

Second, your testcase is invalid C++, to fix it, change
operator== to

   bool operator== (const Int& i2) const {
       return (this->i == i2.i ? true : false);
   }

as you cannot bind a temporary (which Int(2) is) to an
lvalue reference.

Your other compilers are wrong in accepting the code.

Richard.

g++; operator==

[Markus Bina]

Hi!

g++ Version:                3.3.5
Linux-distribution:        Suse 9.2 and Gentoo 2005.0 on Intel Pentium 4
CFLAGS used to compile gcc: -O2 -pipe

I found the following bug:

bash-output:

xyz@linux:~/test> g++ -o Prog.bin Prog.cpp
Prog.cpp: In function `int main()':
Prog.cpp:32: error: no match for 'operator==' in 'i1 == Int(2)'
Prog.cpp:18: error: candidates are: bool Int::operator==(Int&)
xyz@linux:~/test>


BTW: VC++ and TurboC are able to compile it!

--------------------------------------------------------------------

It is far too difficult to describe the bug, so here is a code snippet to 
reproduce the bug:

#include <iostream>
using namespace std;
class Int{
public:
    int i;
    Int(){
        this->i = 0;
    }
    Int(int i2){
        this->i = i2;
    }
    Int& operator= (Int& i2){
        this->i = i2.i;
        return *this;
    }
    bool operator== (Int& i2){
        return (this->i == i2.i ? true : false);
    }
};

int main(){
    Int i1(10);
    Int i2(20);
    // works
    cout << (i1 == i2) << endl;

    // does not work; but it should
    cout << (i1 == Int(2)) << endl;

    return 0;
}