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![Jake Macdonald](/assets/img/avatar_default.png)
Change-Id: Ia0b38bfbdc3c2fe9747d024d05364c8aed4b1909 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/349580 Commit-Queue: Alexander Aprelev <aam@google.com> Reviewed-by: Alexander Aprelev <aam@google.com> Auto-Submit: Jake Macdonald <jakemac@google.com>
75 lines
1.9 KiB
Dart
75 lines
1.9 KiB
Dart
// Copyright (c) 2019, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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import 'dart:ffi';
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import 'package:ffi/ffi.dart';
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import 'coordinate.dart';
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main() {
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print('start main');
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{
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// Allocates each coordinate separately in c memory.
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final c1 = calloc<Coordinate>()
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..ref.x = 10.0
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..ref.y = 10.0;
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final c2 = calloc<Coordinate>()
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..ref.x = 20.0
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..ref.y = 20.0
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..ref.next = c1;
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final c3 = calloc<Coordinate>()
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..ref.x = 30.0
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..ref.y = 30.0
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..ref.next = c2;
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c1.ref.next = c3;
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Coordinate currentCoordinate = c1.ref;
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for (var _ in [0, 1, 2, 3, 4]) {
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currentCoordinate = currentCoordinate.next.ref;
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print("${currentCoordinate.x}; ${currentCoordinate.y}");
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}
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calloc.free(c1);
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calloc.free(c2);
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calloc.free(c3);
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}
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{
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// Allocates coordinates consecutively in c memory.
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Pointer<Coordinate> c1 = calloc<Coordinate>(3);
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Pointer<Coordinate> c2 = c1 + 1;
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Pointer<Coordinate> c3 = c1 + 2;
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c1.ref.x = 10.0;
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c1.ref.y = 10.0;
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c1.ref.next = c3;
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c2.ref.x = 20.0;
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c2.ref.y = 20.0;
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c2.ref.next = c1;
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c3.ref.x = 30.0;
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c3.ref.y = 30.0;
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c3.ref.next = c2;
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Coordinate currentCoordinate = c1.ref;
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for (var _ in [0, 1, 2, 3, 4]) {
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currentCoordinate = currentCoordinate.next.ref;
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print("${currentCoordinate.x}; ${currentCoordinate.y}");
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}
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calloc.free(c1);
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}
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{
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// Allocating in native memory returns a pointer.
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final c = calloc<Coordinate>();
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print(c is Pointer<Coordinate>); // ignore: unnecessary_type_check
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// `.ref` returns a reference which gives access to the fields.
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print(c.ref is Coordinate); // ignore: unnecessary_type_check
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calloc.free(c);
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}
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print("end main");
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}
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