[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 <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.


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