f8/sdk/dart/package-fidl_fidl/Binding/wrap.md

# wrap method








[InterfaceHandle](../../package-fidl_fidl/InterfaceHandle-class.md)<T> wrap
(T impl)





<p>Returns an interface handle whose peer is bound to the given object.</p>
<p>Creates a channel pair, binds one of the channels to this object, and
returns the other channel. Messages sent over the returned channel will be
decoded and dispatched to <code>impl</code>.</p>
<p>The <code>impl</code> parameter must not be null.</p>



## Implementation

```dart
InterfaceHandle<T>? wrap(T impl) {
  assert(!isBound);
  ChannelPair pair = ChannelPair();
  if (pair.status != ZX.OK) {
    return null;
  }
  _impl = impl;
  _reader.bind(pair.first!);

  final callback = onBind;
  if (callback != null) {
    callback();
  }

  return InterfaceHandle<T>(pair.second);
}
```