Labelled Blocks
Blocks in Zig are expressions and can be given labels, which are used to yield
values. Here, we are using a label called blk
. Blocks yield values, meaning
they can be used in place of a value. The value of an empty block {}
is a
value of the type void
.
test "labelled blocks" {
const count = blk: {
var sum: u32 = 0;
var i: u32 = 0;
while (i < 10) : (i += 1) sum += i;
break :blk sum;
};
try expect(count == 45);
try expect(@TypeOf(count) == u32);
}
This can be seen as being equivalent to C's i++
.
blk: {
const tmp = i;
i += 1;
break :blk tmp;
}