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const std = @import("std");
const builtin = @import("builtin");
const native_endian = builtin.target.cpu.arch.endian();
const expect = std.testing.expect;
const expectEqual = std.testing.expectEqual;
const expectEqualSlices = std.testing.expectEqualSlices;
const maxInt = std.math.maxInt;
const Node = struct {
val: Val,
next: *Node,
};
const Val = struct {
x: i32,
};
test "struct point to self" {
var root: Node = undefined;
root.val.x = 1;
var node: Node = undefined;
node.next = &root;
node.val.x = 2;
root.next = &node;
try expect(node.next.next.next.val.x == 1);
}
test "void struct fields" {
const foo = VoidStructFieldsFoo{
.a = void{},
.b = 1,
.c = void{},
};
try expect(foo.b == 1);
try expect(@sizeOf(VoidStructFieldsFoo) == 4);
}
const VoidStructFieldsFoo = struct {
a: void,
b: i32,
c: void,
};
test "return empty struct from fn" {
_ = testReturnEmptyStructFromFn();
}
const EmptyStruct2 = struct {};
fn testReturnEmptyStructFromFn() EmptyStruct2 {
return EmptyStruct2{};
}
test "pass slice of empty struct to fn" {
try expect(testPassSliceOfEmptyStructToFn(&[_]EmptyStruct2{EmptyStruct2{}}) == 1);
}
fn testPassSliceOfEmptyStructToFn(slice: []const EmptyStruct2) usize {
return slice.len;
}
test "self-referencing struct via array member" {
const T = struct {
children: [1]*@This(),
};
var x: T = undefined;
x = T{ .children = .{&x} };
try expect(x.children[0] == &x);
}
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