tests/language_strong/function_literals2_test.dart

// Copyright (c) 2011, 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.
//
// Dart test for new function type alias.

import "package:expect/expect.dart";

class FunctionLiteralsTest {

  static void testMain() {
    f(x) { return x * 2;}
    f(42);  // make sure it is parsed as a function call
    Expect.equals(20, f(10));

    int g(x) { return x * 2;}
    g(42);  // make sure it is parsed as a function call
    Expect.equals(20, g(10));

    h(x) { return x * 2;}
    h(42);  // make sure it is parsed as a function call
    Expect.equals(20, h(10));

    var a = (x) {return x + 2;};
    Expect.equals(7, a(5));

    Expect.equals(10, apply((k) { return k << 1;}, 5));
    Expect.equals(20, apply((k) => k << 1, 10));

    a = new A(3);
    Expect.equals(-1, a.f);
    Expect.equals(-3, a.f2);

    a = new A.n(5);
    Expect.equals(-2, a.f);
    Expect.equals(2, a.f2);

    Expect.equals(true, isOdd(5));
    Expect.equals(false, isOdd(8));

    var b = new B(10);
    Expect.equals(10, b.n);
    Expect.equals(100, (b.f)(10));

    b = new B.withZ(10);
    Expect.equals(10, b.n);
    Expect.equals(101, (b.f)(10));

    var c = new C(5);
    Expect.equals("2*x is 10", c.s);

    int x = 0;
    int y = 1;
    // make sure this isn't parsed as a generic type
    Expect.isTrue(x<y, "foo");
  }
}

apply(f, n) {
  return f(n);
}

bool isOdd(b) => b % 2 == 1;

class A {
  int f;
  int f2;
  A(p) : f = apply((j) => 2 - j, p) { /* constr. body */ f2 = -p; }
  A.n(p) : f = 1 + apply((j) => 2 - j, p) { /* constr. body */ f2 = -f; }
}

class B {
  var f;
  int n;
  B(z) : f = ((x) => x * x) { n = z; }
  B.withZ(z) : f = ((x) { return x * x + 1; }) { n = z; }
}

class C {
  String s;
  C(x) : s = "2*x is ${() { return 2*x; }()}";
}
main() {
  FunctionLiteralsTest.testMain();
}