Re: uninitializing constructor

[david]

Hello,

I'd like to know whether g++ can detect a member variable which is not
initialized (on purpose) by the constructor.

Easier with a simple example (the class is supposed to be a fixed point
variable):

class A
{
private:
       int my_value;
       A (int init)      { my_value = init; }
public:
       A () {}
       A (const A& init) { my_value = init.my_value; }
       A& operator = (int scalar) { my_value = scalar << 8; }
       ...
};

int main (void)
{
       int p, q;
       A x, y;

       p = q;
       y = x;
}

g++ complains about q beeing used but not initialized, is there a way for it
to complain about x too ?
I tried the options -O -Wall -Wextra.

(yes I could put 0 in the constructor, but code size is critical in the
embedded environment I use, and I'm curious too :-)

I also tried "A () const {}" but it is refused.

I know from comp.lang.c++ that this is not a c++standard request to do so,
but there are always some interesting stuff in gcc that I don't know :-)

Thanks for any information,

david