ScopedLocker.h

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/****************************************************************************/
// Eclipse SUMO, Simulation of Urban MObility; see https://eclipse.dev/sumo
// Copyright (C) 2018-2025 German Aerospace Center (DLR) and others.
// This program and the accompanying materials are made available under the
// terms of the Eclipse Public License 2.0 which is available at
// https://www.eclipse.org/legal/epl-2.0/
// This Source Code may also be made available under the following Secondary
// Licenses when the conditions for such availability set forth in the Eclipse
// Public License 2.0 are satisfied: GNU General Public License, version 2
// or later which is available at
// https://www.gnu.org/licenses/old-licenses/gpl-2.0-standalone.html
// SPDX-License-Identifier: EPL-2.0 OR GPL-2.0-or-later
/****************************************************************************/
// A scoped lock which only triggers on condition
/****************************************************************************/
#pragma once
#include <config.h>
 
 
// ===========================================================================
// class declarations
// ===========================================================================
namespace FX {
class FXMutex;
}
 
 
// ===========================================================================
// class definitions
// ===========================================================================
template<typename T = FX::FXMutex, bool IGNORE_COND = false>
class ScopedLocker {
 
public:
#ifdef _MSC_VER
#pragma warning(push)
#pragma warning(disable: 4127) // mask warning about constant condition
#endif
    ScopedLocker(T& m, const bool condition = true)
        : myMutex(m), myCondition(condition) {
        if (IGNORE_COND || condition) {
            m.lock();
        }
    }
 
    ~ScopedLocker() {
        if (IGNORE_COND || myCondition) {
            myMutex.unlock();
        }
    }
#ifdef _MSC_VER
#pragma warning(pop)
#endif
 
private:
    T& myMutex;
    const bool myCondition;
 
private:
    ScopedLocker& operator=(const ScopedLocker&) = delete;
};