[Bug c++/27295] New: Compiler expects public access of copy constructor eventhough the cp ctr never get's invoked.

[ram dot misc at gmail dot com]

The foll. code works with GCC 2.95.2; however, it fails compile on GCC 2.4.5.

Whenever an anonymous object is passed as function argument, the compiler is
expecting "public access" to the copy constructor of the passed type - even
though the cp ctr never get's invoked. 

====================================
compilation error: [g++ 3.4.5]
private_cp_ctr.cc: In function `int main()':
private_cp_ctr.cc:42: error: `Foo::Foo(const Foo&)' is private
private_cp_ctr.cc:60: error: within this context
====================================
code:

#include <cstdio>

class Foo
{
public:
    Foo()
    {
        printf( "ctr called.\n" );
    }

private:
    Foo(const Foo&) // problem location
    {
        printf( "cp ctr called.\n" );
    }
};

void evaluate(const Foo& ref)
{
    printf( "evaluate called.\n" );
}

int main()
{
    Foo f;

    evaluate(f); // ok: no compile error

    // problem context. compiler checks for copy ctr public visibility
    // eventhough the copy ctr never get's invoked in the context.
    evaluate(Foo());

    return 0;
}
==================================

Thankyou.


-- 
           Summary: Compiler expects public access of copy constructor
                    eventhough the cp ctr never get's invoked.
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: ram dot misc at gmail dot com


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27295