Copy constructor not called.

[Mustafa4LP <mustafa.hussain@xxxxxxxxxxx>]

Hi all,

Please consider the following program:

#include <iostream>
using namespace std;
class A
{
public:
   A ()
   {
      cout << "constructor" << endl;
   }
   A (A &a)
   {
      cout << "copy constructor" << endl;
   }
   A operator = (const A &a)
   {
      cout << "= operator" << endl;
   }
};
int main()
{
   A a;
   A b;
   b = ( b = a );
}


Following error is issued while running the above test case on gcc 3.4.6

test007.cpp: In function `int main()':
test007.cpp:23: error: no matching function for call to `A::A(A)'
test007.cpp:11: note: candidates are: A::A(A&)

However, if I change the argument of copy constructor to "const A &", the
program compiles finely.
I could not understand why const is required in copy constructor for running
the test case.

Also note that in the output of the modified program (which compiled
finely), no copy constructor is called.
I am running the test case with --no-elide-constructors option to disable
the RVO (so that I can get all copy constructor calls).

Thanks in advance for any help.

Regards,
Mustafa 
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