mirror of
https://github.com/monero-project/monero.git
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jeffro256
05ab316853
1. Doesn't allocate a `boost::shared_ptr` 2. Doesn't use a vtable 3. Doesn't use `std::function` wrapper 4. Doesn't necessarily copy functional object 5. Doesn't need a factory function for simple declaration (yay CTAD) 6. Isolated to its own header 7. Name doesn't suck as much
100 lines
3.2 KiB
C++
100 lines
3.2 KiB
C++
// Copyright (c) 2025, The Monero Project
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//
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without modification, are
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// permitted provided that the following conditions are met:
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//
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// 1. Redistributions of source code must retain the above copyright notice, this list of
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// conditions and the following disclaimer.
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//
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// 2. Redistributions in binary form must reproduce the above copyright notice, this list
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// of conditions and the following disclaimer in the documentation and/or other
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// materials provided with the distribution.
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//
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// 3. Neither the name of the copyright holder nor the names of its contributors may be
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// used to endorse or promote products derived from this software without specific
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// prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
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// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
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// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
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// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#pragma once
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#include <utility>
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namespace epee
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{
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/**
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* @brief: scope_guard - RAII pattern to call action on scope leave
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*/
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template <class F>
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class scope_guard final
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{
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public:
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// no copy
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scope_guard(const scope_guard&) = delete;
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scope_guard& operator=(const scope_guard&) = delete;
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// constructor with CTAD
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scope_guard(F &&f): m_f(std::forward<F>(f)) {}
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// call action
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~scope_guard() noexcept { try { m_f(); } catch (...) { /* ignore exception in destructor */ } }
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private:
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F m_f;
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};
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/**
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* @brief: unique_scope_guard - RAII pattern to call action on scope leave and/or at explicit call
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*/
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template <class F>
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class unique_scope_guard final
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{
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public:
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// no copy
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unique_scope_guard(const unique_scope_guard&) = delete;
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unique_scope_guard& operator=(const unique_scope_guard&) = delete;
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// move resets current state and releases other instance
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unique_scope_guard(unique_scope_guard &&other): m_f(std::move(other.m_f)), m_do(other.m_do)
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{
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other.release();
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}
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unique_scope_guard& operator=(unique_scope_guard &&other)
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{
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if (this != &other)
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{
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reset();
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m_f = std::move(other.m_f);
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m_do = other.m_do;
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other.release();
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}
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return *this;
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}
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// constructor with CTAD
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unique_scope_guard(F &&f): m_f(std::forward<F>(f)), m_do(true) {}
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void reset() { if (m_do) { m_do = false; m_f(); } }
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void release() { m_do = false; }
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// call action
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~unique_scope_guard() noexcept { try { reset(); } catch (...) { /* ignore exception in destructor */ } }
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private:
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F m_f;
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bool m_do;
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};
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} //namespace epee
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