[Bug c++/30959] New: copy consturctor influences compile errors of constructor from unrelated class

[sl at datamyway dot de]

Depending on whether the copy constructor CA(const CA& a) (see following code)
is private, public or not (explicitly) defined the constructor   CA(const SA&
a) from the unrelated class SA gets compile errors.
It compiles for public and undefined, but not for private.
If CA(const CA& a) is public, the code compiles and runs as expected, and
CA(const CA& a) is not executed (but somehow needed for compilation?!).
---

on SuSe linux 10.0 with
~/wurschtel/cpp> uname -a
Linux djebe 2.6.13-15-smp #1 SMP Tue Sep 13 14:56:15 UTC 2005 i686 i686 i386
GNU/Linux
and gcc 4.0.2 (but also with 4.1.2)
the code (file y.cpp) 
-----
//originally from http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13478, modified
#include <iostream>
using namespace std;

class SA
{
};

class CA
{
public:
  CA()
  {
    cout << "CA()" << endl;
  };

  CA(const SA& a)
  {
    cout << "CA(const SA& a)" << endl;
  };


private:
  CA(const CA& a)
  {
    cout << "CA(const CA& a)" << endl;
  };


};

void foo(const SA& pa)
{
  const CA ra=CA(pa);
}

int main (int argc, char* argv[])
{
  const SA* pa = new SA();
  const CA pb(*pa);

  foo(*pa);

}


-----
gives compile errors:
g++ -ansi -pedantic -Wall -o y y.cpp
y.cpp: In function ‘void foo(const SA&)’:
y.cpp:27: error: ‘CA::CA(const CA&)’ is private
y.cpp:37: error: within this context
y.cpp:27: error: ‘CA::CA(const CA&)’ is private
y.cpp:37: error: within this context
slehr@djebe:~/wurschtel/cpp>


-- 
           Summary: copy consturctor influences compile errors of
                    constructor from unrelated class
           Product: gcc
           Version: 4.0.2
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: sl at datamyway dot de


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30959