zig/test/cases/undefined.zig

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const assert = @import("std").debug.assert;
fn initStaticArray() -> [10]i32 {
var array: [10]i32 = undefined;
array[0] = 1;
array[4] = 2;
array[7] = 3;
array[9] = 4;
return array;
}
const static_array = initStaticArray();
test "init static array to undefined" {
assert(static_array[0] == 1);
assert(static_array[4] == 2);
assert(static_array[7] == 3);
assert(static_array[9] == 4);
comptime {
assert(static_array[0] == 1);
assert(static_array[4] == 2);
assert(static_array[7] == 3);
assert(static_array[9] == 4);
}
}
const Foo = struct {
x: i32,
fn setFooXMethod(foo: &Foo) {
foo.x = 3;
}
};
fn setFooX(foo: &Foo) {
foo.x = 2;
}
test "assign undefined to struct" {
comptime {
var foo: Foo = undefined;
setFooX(&foo);
assert(foo.x == 2);
}
{
var foo: Foo = undefined;
setFooX(&foo);
assert(foo.x == 2);
}
}
test "assign undefined to struct with method" {
comptime {
var foo: Foo = undefined;
foo.setFooXMethod();
assert(foo.x == 3);
}
{
var foo: Foo = undefined;
foo.setFooXMethod();
assert(foo.x == 3);
}
}