Let's consider the following piece of code:
#include <stdio.h>
int main() {
int err =
(
{
int _err = 0;
for (int i = 0; i < 100; ++i) {
_err += i;
}
_err;
}
);
printf("%d", err);
}
I have found it (or well, a more complex incarnation of it) in the gcc testsuite and I became baffled by the construct:
int outer_var = ( { int local_var = 0; /* do some work on local_var */ local_var; } );
If I remove the braces (or the ; after the ) ), it fails to compile, but with braces on it compiles as c or even c++. What it does is more or less clear to me (although I have to admit, this is the very first time that I see a single variable in a standalone statement (_err;) which actually has a meaning) but I just haven't seen this construct till now, so I'd like to ask if there is an official name for it in any of the C or C++ standards.
