zig/test/cases/var_args.zig

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const assert = @import("std").debug.assert;
fn add(args: ...) -> i32 {
var sum = i32(0);
{comptime var i: usize = 0; inline while (i < args.len) : (i += 1) {
sum += args[i];
}}
return sum;
}
test "testAddArbitraryArgs" {
assert(add(i32(1), i32(2), i32(3), i32(4)) == 10);
assert(add(i32(1234)) == 1234);
assert(add() == 0);
}
fn readFirstVarArg(args: ...) {
const value = args[0];
}
test "sendVoidArgToVarArgs" {
readFirstVarArg({});
}
test "testPassArgsDirectly" {
assert(addSomeStuff(i32(1), i32(2), i32(3), i32(4)) == 10);
assert(addSomeStuff(i32(1234)) == 1234);
assert(addSomeStuff() == 0);
}
fn addSomeStuff(args: ...) -> i32 {
return add(args);
}
test "runtime parameter before var args" {
assert(extraFn(10) == 0);
assert(extraFn(10, false) == 1);
assert(extraFn(10, false, true) == 2);
// TODO issue #313
//comptime {
// assert(extraFn(10) == 0);
// assert(extraFn(10, false) == 1);
// assert(extraFn(10, false, true) == 2);
//}
}
fn extraFn(extra: u32, args: ...) -> usize {
if (args.len >= 1) {
assert(args[0] == false);
}
if (args.len >= 2) {
assert(args[1] == true);
}
return args.len;
}