putPtr method

H putPtr(P value, H f())

Implementation

H putPtr(P value, H Function() f) {
  if (value == nullptr) {
    throw AssertionError('Value is null');
  }
  final existing = from[value]?.target;
  if (existing != null) {
    return existing;
  }
  final key = f();
  if (to[key] != null) {
    return key;
  }
  acquire(value);
  to[key] = value;
  from[value] = WeakReference(key);
  finalizer.attach(key, value);
  return key;
}