v/vlib/v/tests/struct_embed_test.v

import flag
import v.tests.field_publicity

struct Foo {
	x int
	y int = 5
}

fn (f Foo) foo() {}

struct Bar {
	Foo
}

fn test_embed() {
	b := Bar{}
	assert b.x == 0
	b.foo()
}

fn test_embed_direct_access() {
	b := Bar{
		Foo: Foo{}
	}
	assert b.Foo.y == 5
}

fn test_default_value() {
	b := Bar{
		Foo: Foo{}
	}
	assert b.y == 5
}

fn test_default_value_without_init() {
	b := Bar{}
	assert b.y == 5
}

fn test_initialize() {
	b := Bar{
		x: 1
		y: 2
	}
	assert b.x == 1
	assert b.y == 2
}

struct Bar3 {
	Foo
	y string = 'test'
}

fn test_overwrite_field() {
	b := Bar3{}
	assert b.y == 'test'
}

struct TestEmbedFromModule {
	flag.Flag
}

struct BarGeneric<T> {
pub:
	foo T
}

struct BarGenericContainer {
	BarGeneric<int>
}

fn test_generic_embed() {
	b := BarGenericContainer{}
	assert b.BarGeneric.foo == 0
	assert b.foo == 0
}

struct Upper {
mut:
	x int
}

struct UpperHolder {
	Upper
}

fn test_assign() {
	mut h := UpperHolder{}
	h.x = 5
	assert h.x == 5
}

fn test_embed_is_public() {
	a := field_publicity.App{}
	assert a.Context.name == ''
}

struct Eggs {
	name string
}

fn (f &Eggs) test(x int) int {
	return x
}

struct Breakfast {
	Eggs
}

fn (b &Breakfast) name() string {
	return b.name
}

fn test_embed_method_receiver_ptr() {
	b := Breakfast{}
	assert b.test(5) == 5
}

fn test_embed_field_receiver_ptr() {
	b := Breakfast{}
	assert b.name() == ''
}

fn test_embed_mutable() {
	mut a := field_publicity.App{}
	a.Context = field_publicity.Context{}
}

struct Context {
	static_files string
}

fn (c Context) test() bool {
	return true
}

struct App {
	Context
}

fn embed_field_access_generic<T>(mut app T) {
	app.Context = Context{
		static_files: app.static_files
	}
}

fn test_embed_field_access_generic() {
	mut app := App{}
	embed_field_access_generic(mut app)
}

fn embed_method_generic<T>(app T) bool {
	return app.test()
}

fn test_embed_method_generic() {
	mut app := App{}
	assert embed_method_generic(app)
}

type Piece = King | Queen

struct Pos {
	x u8
	y u8
}

enum TeamEnum {
	black
	white
}

struct PieceCommonFields {
	pos  Pos
	team TeamEnum
}

fn (p PieceCommonFields) get_pos() Pos {
	return p.pos
}

struct King {
	PieceCommonFields
}

struct Queen {
	PieceCommonFields
}

fn (piece Piece) pos() Pos {
	mut pos := Pos{}
	match piece {
		King, Queen { pos = piece.pos }
	}
	return pos
}

fn (piece Piece) get_pos() Pos {
	mut pos := Pos{}
	match piece {
		King, Queen { pos = piece.get_pos() }
	}
	return pos
}

fn test_match_aggregate_field() {
	piece := Piece(King{
		pos: Pos{1, 8}
		team: .black
	})
	pos := piece.pos()
	assert pos.x == 1
	assert pos.y == 8
}

fn test_match_aggregate_method() {
	piece := Piece(King{
		pos: Pos{1, 8}
		team: .black
	})
	pos := piece.get_pos()
	assert pos.x == 1
	assert pos.y == 8
}