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kallentu/variance_example.dart

Last active December 19, 2019 17:26
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variance_example.dart
class Writer<in T> {
void write(T value) => print(value);
}
class Reader<out T> {
final T value;
Reader(this.value);
T read() => value;
}
main() {
Writer<int> intWriter = Writer<Object>();
intWriter.write(2);
Reader<Object> objectReader =
Reader<String>("Wow, this is soundly variant!");
print(objectReader.value);
}
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