| // Copyright (c) 2017, the Dart project authors. Please see the AUTHORS file |
| // for details. All rights reserved. Use of this source code is governed by a |
| // BSD-style license that can be found in the LICENSE file. |
| |
| library object_field_initializers_test; |
| |
| /// Simple program creating an object with instance field initializers in the |
| /// declaration of the class. |
| /// |
| /// The static function `fieldInitializer` is used to ensure the fields are |
| /// intialized in the correct order by tracking the order of side effects. |
| void main() { |
| print('Create instance of A'); |
| var a1 = new A.withoutArguments(); |
| print(a1.foo1); |
| print(a1.foo2); |
| print(a1.foo3); |
| var a2 = new A('bar1', 'bar2'); |
| print(a2.foo1); |
| print(a2.foo2); |
| print(a2.foo3); |
| |
| print('Create instance of B'); |
| var b = new B(fieldInitializer(1, 'bar1'), fieldInitializer(2, 'bar2')); |
| print(b.foo1); |
| print(b.foo2); |
| print(b.foo3); |
| print(b.foo4); |
| |
| print('Create instance of C'); |
| var c = new C(fieldInitializer(1, 'bar1'), fieldInitializer(2, 'bar2')); |
| print(c.foo1); |
| print(c.foo2); |
| print(c.foo3); |
| } |
| |
| class A { |
| String foo1 = 'foo1'; |
| String foo2; |
| String foo3 = 'foo3'; |
| |
| A.withoutArguments(); |
| A(String foo1, String foo2) { |
| this.foo1 = foo1; |
| this.foo2 = foo2; |
| } |
| } |
| |
| class B { |
| String foo1 = fieldInitializer(3, 'foo1'); |
| String foo2; |
| String foo3 = fieldInitializer(4, 'foo3'); |
| String foo4 = fieldInitializer(5, 'foo4'); |
| |
| B(String foo1, String foo2) { |
| this.foo1 = foo1; |
| this.foo2 = foo2; |
| this.foo4 = fieldInitializer(6, 'bar4'); |
| } |
| } |
| |
| class C { |
| String foo1 = fieldInitializer(1, 'foo1'); |
| String foo2; |
| String foo3 = fieldInitializer(2, 'foo3'); |
| |
| C(this.foo1, this.foo2) { |
| foo3 = fieldInitializer(3, 'foo3'); |
| } |
| } |
| |
| String fieldInitializer(int f, String s) { |
| print('$s: $f'); |
| return '$s: $f'; |
| } |