description

# refWithFinalizer method

1. @Since.new('3.7')

T refWithFinalizer(

1. Pointer<NativeFinalizerFunction> finalizer, {
2. Pointer<Void>? token,

})

A Dart view of the union referenced by this pointer.

Creates a reference accessing the fields of this union backed by native memory at address. The address must be aligned according to the union alignment rules of the platform.

Attaches `finalizer` to the backing store of the union. If provided, `token` will be passed to `finalizer`, otherwise the pointer (`this`) itself will be passed. The pointer (`this`) must not be used anymore if the union is not guaranteed to be kept alive. Prefer doing any native calls with the pointer before calling refWithFinalizer.

This extension method must be invoked on a receiver of type `Pointer<T>` where `T` is a compile-time constant type.

## Implementation

    @Since('3.7')
    external T refWithFinalizer(
      Pointer<NativeFinalizerFunction> finalizer, {
      Pointer<Void>? token,
    });