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<?hh // strict | ||
/* | ||
* Copyright (c) 2004-present, Facebook, Inc. | ||
* All rights reserved. | ||
* | ||
* This source code is licensed under the MIT license found in the | ||
* LICENSE file in the root directory of this source tree. | ||
* | ||
*/ | ||
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namespace HH\Lib; | ||
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/** Wrapper class for getting object (byref) semantics for a value type. | ||
* | ||
* This is especially useful for mutating values outside of a lambda's scope. | ||
* | ||
* In general, it's preferable to refactor to use return values or `inout` | ||
* parameters instead of using this class - however, a `Ref` of a Hack array | ||
* is generally preferable to a Hack collection - e.g. prefer `Ref<vec<T>>` | ||
* over `Vector<T>`. | ||
* | ||
* `C\reduce()` and `C\reduce_with_key()` can also be used in some situations | ||
* to avoid this class. | ||
*/ | ||
final class Ref<T> { | ||
<<__RxShallow>> | ||
public function __construct(public T $value) {} | ||
} |