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65 lines
2.1 KiB
65 lines
2.1 KiB
5 months ago
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/* Copyright (c) 2016, 2019, Oracle and/or its affiliates. All rights reserved.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License, version 2.0,
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as published by the Free Software Foundation.
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This program is also distributed with certain software (including
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but not limited to OpenSSL) that is licensed under separate terms,
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as designated in a particular file or component or in included license
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documentation. The authors of MySQL hereby grant you an additional
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permission to link the program and your derivative works with the
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separately licensed software that they have included with MySQL.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License, version 2.0, for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
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#ifndef SCOPE_GUARD_H
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#define SCOPE_GUARD_H
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template <typename TLambda>
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class Scope_guard {
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public:
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Scope_guard(const TLambda &rollback_lambda)
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: m_committed(false), m_rollback_lambda(rollback_lambda) {}
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Scope_guard(const Scope_guard<TLambda> &) = delete;
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Scope_guard(Scope_guard<TLambda> &&moved)
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: m_committed(moved.m_committed),
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m_rollback_lambda(moved.m_rollback_lambda) {
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/* Set moved guard to "invalid" state, the one in which the rollback lambda
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will not be executed. */
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moved.m_committed = true;
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}
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~Scope_guard() {
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if (!m_committed) {
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m_rollback_lambda();
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}
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}
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inline void commit() { m_committed = true; }
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inline void rollback() {
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if (!m_committed) {
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m_rollback_lambda();
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m_committed = true;
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}
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}
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private:
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bool m_committed;
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const TLambda m_rollback_lambda;
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};
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template <typename TLambda>
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Scope_guard<TLambda> create_scope_guard(const TLambda rollback_lambda) {
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return Scope_guard<TLambda>(rollback_lambda);
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}
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#endif /* SCOPE_GUARD_H */
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