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d16772a31e
Summary: * Fixed semantic: all kinds of derivative instances lose `sealed` flag (which is expected); * Using atomic<bool> for `sealed_` ivar. Reviewed By: fkgozali Differential Revision: D7230674 fbshipit-source-id: abe786610c20a45a0fabb9068120e24adeeeac7f
61 lines
1.3 KiB
C++
61 lines
1.3 KiB
C++
/**
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* Copyright (c) 2015-present, Facebook, Inc.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*/
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#include "Sealable.h"
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#include <stdexcept>
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namespace facebook {
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namespace react {
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/*
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* Note:
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* We must explictly implement all *the rule of five* methods because:
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* 1. Using `std::atomic` behind `sealed_` implicitly deletes default
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* constructors;
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* 2. We have to establish behaviour where any new cloned or moved instances
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* of the object lose `sealed` flag.
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*
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* See more about the rule of three/five/zero:
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* http://en.cppreference.com/w/cpp/language/rule_of_three
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*/
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Sealable::Sealable(): sealed_(false) {}
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Sealable::Sealable(const Sealable& other): sealed_(false) {};
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Sealable::Sealable(Sealable&& other) noexcept: sealed_(false) {};
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Sealable::~Sealable() noexcept {};
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Sealable& Sealable::operator= (const Sealable& other) {
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ensureUnsealed();
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return *this;
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}
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Sealable& Sealable::operator= (Sealable&& other) noexcept {
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ensureUnsealed();
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return *this;
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};
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void Sealable::seal() const {
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sealed_ = true;
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}
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bool Sealable::getSealed() const {
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return sealed_;
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}
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void Sealable::ensureUnsealed() const {
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if (sealed_) {
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throw std::runtime_error("Attempt to mutate a sealed object.");
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}
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}
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} // namespace react
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} // namespace facebook
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