f9/sdk/dart/package-fidl_fidl/Binding/bind.md

# bind method








void bind
(T impl, [InterfaceRequest](../../package-fidl_fidl/InterfaceRequest-class.md)<T> interfaceRequest)





<p>Binds the given implementation to the given interface request.</p>
<p>Listens for messages on channel underlying the given interface request,
decodes them, and dispatches the decoded messages to <code>impl</code>.</p>
<p>This object must not already be bound.</p>
<p>The <code>impl</code> and <code>interfaceRequest</code> parameters must not be <code>null</code>. The
<code>channel</code> property of the given <code>interfaceRequest</code> must not be <code>null</code>.</p>



## Implementation

```dart
void bind(T impl, InterfaceRequest<T> interfaceRequest) {
  assert(!isBound);
  Channel channel = interfaceRequest.passChannel()!;
  _impl = impl;
  _reader.bind(channel);

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