blob: ab99ed82c3aabaf0681b0e1a9ce70761534b6c25 [file] [log] [blame]
// 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.
import 'dart:ffi';
import 'package:ffi/ffi.dart';
import 'coordinate.dart';
main() {
print('start main');
{
// Allocates each coordinate separately in c memory.
final c1 = calloc<Coordinate>()
..ref.x = 10.0
..ref.y = 10.0;
final c2 = calloc<Coordinate>()
..ref.x = 20.0
..ref.y = 20.0
..ref.next = c1;
final c3 = calloc<Coordinate>()
..ref.x = 30.0
..ref.y = 30.0
..ref.next = c2;
c1.ref.next = c3;
Coordinate currentCoordinate = c1.ref;
for (var i in [0, 1, 2, 3, 4]) {
currentCoordinate = currentCoordinate.next.ref;
print("${currentCoordinate.x}; ${currentCoordinate.y}");
}
calloc.free(c1);
calloc.free(c2);
calloc.free(c3);
}
{
// Allocates coordinates consecutively in c memory.
Pointer<Coordinate> c1 = calloc<Coordinate>(3);
Pointer<Coordinate> c2 = c1.elementAt(1);
Pointer<Coordinate> c3 = c1.elementAt(2);
c1.ref.x = 10.0;
c1.ref.y = 10.0;
c1.ref.next = c3;
c2.ref.x = 20.0;
c2.ref.y = 20.0;
c2.ref.next = c1;
c3.ref.x = 30.0;
c3.ref.y = 30.0;
c3.ref.next = c2;
Coordinate currentCoordinate = c1.ref;
for (var i in [0, 1, 2, 3, 4]) {
currentCoordinate = currentCoordinate.next.ref;
print("${currentCoordinate.x}; ${currentCoordinate.y}");
}
calloc.free(c1);
}
{
// Allocating in native memory returns a pointer.
final c = calloc<Coordinate>();
print(c is Pointer<Coordinate>);
// `.ref` returns a reference which gives access to the fields.
print(c.ref is Coordinate);
calloc.free(c);
}
print("end main");
}