Misha Aizatulin wrote:
hi all,
at the very end of http://stdcxx.apache.org/doc/stdlibug/34-2.html
there is an example of using a reference to create a "copy" of cout.
However this example doesn't initialize the defined reference at once
(which is required in C++) and for this reason doesn't compile with my
gcc 4.2.1.
That's definitely incorrect. The uninitialized reference is not
C++ and as noted in LWG issue 50, stream objects are not copyable.
The next C++ Standard makes that explicit by declaring the copy
ctor and copy assignment operator of class ios_base deleted.
I opened STDCXX-1024 to have the problematic example removed:
http://issues.apache.org/jira/browse/STDCXX-1024
LWG issue #50 for reference
http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#50
Thanks for pointing it out!
Martin
For convenience here is the example:
int main(int argc, char *argv[])
{
std::ostream& fr;
if (argc > 1)
fr = *(new std::ofstream(argv[1]));
else
fr = std::cout;
fr << "Hello world!" << std::endl;
if (&fr!=&std::cout)
delete(&fr);
}
Cheers,
Misha