It’s a GCC extension:
A compound statement enclosed in parentheses may appear as an expression in GNU C. This allows you to use loops, switches, and local variables within an expression.
Recall that a compound statement is a sequence of statements surrounded by braces; in this construct, parentheses go around the braces. For example:
({ int y = foo (); int z; if (y > 0) z = y; else z = - y; z; })
is a valid (though slightly more complex than necessary) expression for the absolute value of
foo ()
.The last thing in the compound statement should be an expression followed by a semicolon; the value of this subexpression serves as the value of the entire construct. (If you use some other kind of statement last within the braces, the construct has type
void
, and thus effectively no value.)…