LanguageFeatures/Extension-methods/explicit_extension_member_invocation_A07_t01.dart

// Copyright (c) 2019, 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.

/// @assertion A simple member invocation on a target expression X is an
/// expression of one of the forms:
/// Member invocation on target X	     Corresponding member name
///   X.id<types>(args)                                  id
/// @description Check explicit extension member invocation in form of
/// X.id<types>(args)
/// @author sgrekhov@unipro.ru


import "../../Utils/expect.dart";

class C {
  String id<T, Y extends num>(T t, Y val) =>
      "C: t=" + t.toString() + ", i=$val";
}

extension Extension1 on C {
  String id<T, Y extends num>(T t, Y val) =>
      "Extension1: t=" + t.toString() + ", i=$val";
}

extension Extension2 on C {
  String id<T, Y extends num>(T t, Y val) =>
      "Extension2: t=" + t.toString() + ", i=$val";
}

main() {
  C c = new C();
  Expect.equals("Extension1: t=Lily was here, i=42",
      Extension1(c).id<String, int>("Lily was here", 42));
  Expect.equals("Extension1: t=Show must go on, i=3.14",
      Extension1(c).id<String, double>("Show must go on", 3.14));
  Expect.equals("Extension2: t=Lily was here, i=42",
      Extension2(c).id<String, int>("Lily was here", 42));
  Expect.equals("Extension2: t=Show must go on, i=3.14",
      Extension2(c).id<String, double>("Show must go on", 3.14));
  Expect.equals("C: t=Show must go on, i=3.14",
      c.id<String, double>("Show must go on", 3.14));
}