Language/Expressions/Function_Expressions/static_type_form_3_async_t01.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.

/// @assertion The static type of a function literal of the form
/// (T1 a1,...,Tn an, {Tn+1 xn+1: d1,...,Tn+k xn+k: dk}) async {s} is
/// (T1,...,Tn, {Tn+1 xn+1,...,Tn+k xn+k}) -> Future.
/// In any case where Ti, 1 <= i <= n + k, is not specified, it is considered
/// to have been specified as dynamic.
/// @description Checks that the static type of function literal of the form
/// (T1 a1,...,Tn an, {Tn+1 xn+1: d1,...,Tn+k xn+k: dk}) async {s} may be
/// assigned to a function type variables with Future return type and
/// corresponding parameter types.
/// @author ngl@unipro.ru


import 'dart:async';

typedef Future futureFunc();
typedef Future futureFuncParam(int p1, {int? p2});

main() {
  futureFunc ff1 = () async {};
  futureFunc ff2 = () async {return true;};
  futureFunc ff3 = () async {return 1;};

  futureFuncParam ffp1 = (int p1, {int? p2}) async {};
  futureFuncParam ffp2 = (int p1, {int? p2}) async { return true; };
  futureFuncParam ffp3 = (int p1, {int? p2}) async { return 1; };
}