mirror of
https://github.com/flutter/flutter.git
synced 2026-02-20 02:29:02 +08:00
23 lines
604 B
Markdown
23 lines
604 B
Markdown
Dart Utilities Used By dart:sky
|
|
===============================
|
|
|
|
The classes defined here are used internally by dart:sky but are
|
|
pretty generic.
|
|
|
|
```dart
|
|
class Pair<A, B> {
|
|
const Pair(this.a, this.b);
|
|
final A a;
|
|
final B b;
|
|
int get hashCode => a.hashCode ^ b.hashCode;
|
|
bool operator==(other) => other is Pair<A, B> && a == other.a && b == other.b;
|
|
}
|
|
|
|
// MapOfWeakReferences can be implemented in C, using the C Dart API, apparently
|
|
class MapOfWeakReferences<Key, Value> {
|
|
external operator[](Key key);
|
|
external operator[]=(Key key, Value value);
|
|
external bool containsKey(Key key);
|
|
}
|
|
```
|