Guard.h

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#pragma once

#include <OnixS/CboeCFE/Trading/BOE/Threading/Mutex.h>
#include <OnixS/CboeCFE/Trading/BOE/Threading/Semaphore.h>

namespace OnixS {
namespace CboeCFE {
namespace Trading {
namespace BOE {
namespace Threading {

/// Performs automatic acquisition and release of a synchronization object.
template <class Acquirable>
class Guard
{
public:
    /// Acquires the given synchronization object upon initialization.
    Guard(Acquirable &acquirable)
      : acquirable_(acquirable)
    {
        acquirable_.acquire();
    }

    /// Releases the synchronization object upon destruction.
    ~Guard()
    {
        acquirable_.release();
    }

private:
    Acquirable &acquirable_;

    Guard(const Guard &);
    Guard &operator=(const Guard &);
};

// Aliases for guards for known synchronization objects.

typedef Guard<Mutex> MutexGuard;
typedef Guard<Semaphore> SemaphoreGuard;

}
}
}
}
}