Code:

class Something { ... };
void f(Something s)
{
...
}
int main()
{
    Something test;
    // Here comes the question
    f(Something(test));
}

Question: Can I be *SURE* that a new Something won't be unnecessarily
created? Or put another way: will the code generated for
'f(Something(test))'  be exactly the same as for 'f(test)'?

Please note that f takes its parm by value.

Andrei




[ comp.std.c++ is moderated.  To submit articles, try just posting with ]
[ your news-reader.  If that fails, use mailto:std-c++@ncar.ucar.edu    ]
[              --- Please see the FAQ before posting. ---               ]
[ FAQ: http://reality.sgi.com/austern_mti/std-c++/faq.html              ]

"Andrei Alexandrescu" <alexandrescua@micromodeling.com> writes:

   ----------------
| Code:
|
| class Something { ... };
| void f(Something s)
| {
| ...
| }
| int main()
| {
|     Something test;
|     // Here comes the question
|     f(Something(test));
| }
|
| Question: Can I be *SURE* that a new Something won't be unnecessarily
| created? Or put another way: will the code generated for
| 'f(Something(test))'  be exactly the same as for 'f(test)'?
   ----------------

The short answer is *NO*.


--
Gabriel Dos Reis, dosreis@cmla.ens-cachan.fr


[ comp.std.c++ is moderated.  To submit articles, try just posting with ]
[ your news-reader.  If that fails, use mailto:std-c++@ncar.ucar.edu    ]
[              --- Please see the FAQ before posting. ---               ]
[ FAQ: http://reality.sgi.com/austern_mti/std-c++/faq.html              ]