[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 

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

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

[ram dot misc at gmail dot com]

--- Comment #1 from ram dot misc at gmail dot com  2006-04-24 23:24 ---
Correction:

Bug/problem context is GCC 3.4.5 (not 2.4.5) 

Thank you.

(In reply to comment #0)
> 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 
> 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.


-- 


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