perThread.h

/* Copyright (c) 2005-2016, Stefan Eilemann <eile@equalizergraphics.com>
 *
 * This library is free software; you can redistribute it and/or modify it under
 * the terms of the GNU Lesser General Public License version 2.1 as published
 * by the Free Software Foundation.
 *
 * This library is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more
 * details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this library; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#ifndef LUNCHBOX_PERTHREAD_H
#define LUNCHBOX_PERTHREAD_H

#include <lunchbox/compiler.h> // deprecated macro
#include <lunchbox/debug.h>    // LBASSERTINFO
#include <lunchbox/tls.h>      // member

namespace lunchbox
{
namespace detail
{
class PerThread;
}

template <class T>
void perThreadDelete(T* object)
{
    delete object;
}

template <class T>
void perThreadNoDelete(T*)
{
}

template <class T, void (*D)(T*) = &perThreadDelete<T> >
class PerThread
{
public:
    PerThread();
    ~PerThread();

    PerThread<T, D>& operator=(const T* data);
    PerThread<T, D>& operator=(const PerThread<T, D>& rhs);

    T* get();
    const T* get() const;
    T* operator->();
    const T* operator->() const;

    T& operator*()
    {
        LBASSERTINFO(get(), className(this));
        return *get();
    }
    const T& operator*() const
    {
        LBASSERTINFO(get(), className(this));
        return *get();
    }

    bool operator==(const PerThread& rhs) const { return (get() == rhs.get()); }
    bool operator==(const T* rhs) const { return (get() == rhs); }
    bool operator!=(const T* rhs) const { return (get() != rhs); }
    bool operator!() const;

    bool isValid() const;

private:
    TLS tls_;
    PerThread(const PerThread&) = delete;
    PerThread(PerThread&&) = delete;
    PerThread& operator=(const PerThread&&) = delete;
};
}

#include "perThread.ipp" // template implementation

#endif // LUNCHBOX_PERTHREAD_H