mirror of
https://github.com/vtil-project/VTIL-Core
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78 lines
No EOL
3.2 KiB
C++
78 lines
No EOL
3.2 KiB
C++
// Copyright (c) 2020 Can Boluk and contributors of the VTIL Project
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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
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// modification, are 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,
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// this list of conditions and the following disclaimer.
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// 2. Redistributions in binary form must reproduce the above copyright
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// notice, this list of conditions and the following disclaimer in the
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// documentation and/or other materials provided with the distribution.
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// 3. Neither the name of VTIL Project nor the names of its contributors
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// may be used to endorse or promote products derived from this software
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// without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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// 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
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// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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// POSSIBILITY OF SUCH DAMAGE.
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//
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#pragma once
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#include <mutex>
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#include <shared_mutex>
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namespace vtil
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{
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// This type behaves exactly the same as the original lock type, with the
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// exception of constructing it empty if the condition bool is false.
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//
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template<typename lock_type, typename mutex_type>
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struct cnd_variant_lock : lock_type
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{
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// Default constructors
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//
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cnd_variant_lock() {}
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cnd_variant_lock( mutex_type& mtx ) : lock_type{ mtx } {}
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// Construct from mutex and condition.
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//
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cnd_variant_lock( mutex_type& mtx, bool condition )
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{
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// If condition is passed:
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//
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if ( condition )
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{
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// Create a secondary lock with the mutex being actually
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// acquired and swap states with the current empty instance.
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//
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lock_type lock{ mtx };
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this->swap( lock );
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}
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}
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};
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// Declare shortcuts for unique_lock, shared_lock and lock_guard and their deduction guides.
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//
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template<typename T>
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struct cnd_unique_lock : cnd_variant_lock<std::unique_lock<T>, T> { using cnd_variant_lock<std::unique_lock<T>, T>::cnd_variant_lock; };
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template<typename T>
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cnd_unique_lock( T&, bool )->cnd_unique_lock<T>;
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template<typename T>
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struct cnd_shared_lock : cnd_variant_lock<std::shared_lock<T>, T> { using cnd_variant_lock<std::shared_lock<T>, T>::cnd_variant_lock; };
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template<typename T>
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cnd_shared_lock( T&, bool )->cnd_shared_lock<T>;
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template<typename T>
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struct cnd_lock_guard : cnd_variant_lock<std::lock_guard<T>, T> { using cnd_variant_lock<std::lock_guard<T>, T>::cnd_variant_lock; };
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template<typename T>
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cnd_lock_guard( T&, bool )->cnd_lock_guard<T>;
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}; |