/*
    Copyright 2011 Will Stephenson <wstephenson@kde.org>

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2.1 of the License, or (at your option) version 3, or any
    later version accepted by the membership of KDE e.V. (or its
    successor approved by the membership of KDE e.V.), which shall
    act as a proxy defined in Section 6 of version 3 of the license.

    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, see <http://www.gnu.org/licenses/>.
*/

#ifndef NETWORKMANAGERQT_MACROS_H
#define NETWORKMANAGERQT_MACROS_H

# define NM_GLOBAL_STATIC_STRUCT_NAME(NAME)
typedef void (*NmCleanUpFunction)();
class NmCleanUpGlobalStatic
{
public:
    NmCleanUpFunction func;

    inline ~NmCleanUpGlobalStatic() {
        func();
    }
};

#define NM_GLOBAL_STATIC(TYPE, NAME) NM_GLOBAL_STATIC_WITH_ARGS(TYPE, NAME, ())
#define NM_GLOBAL_STATIC_WITH_ARGS(TYPE, NAME, ARGS)                            \
    static QBasicAtomicPointer<TYPE > _nm_static_##NAME = Q_BASIC_ATOMIC_INITIALIZER(0); \
    static bool _nm_static_##NAME##_destroyed;                                      \
    static struct NM_GLOBAL_STATIC_STRUCT_NAME(NAME)                                \
    {                                                                              \
        inline bool isDestroyed() const                                            \
        {                                                                          \
            return _nm_static_##NAME##_destroyed;                                   \
        }                                                                          \
        inline bool exists() const                                                 \
        {                                                                          \
            return _nm_static_##NAME != 0;                                          \
        }                                                                          \
        inline operator TYPE*()                                                    \
        {                                                                          \
            return operator->();                                                   \
        }                                                                          \
        inline TYPE *operator->()                                                  \
        {                                                                          \
            if (!_nm_static_##NAME) {                                               \
                if (isDestroyed()) {                                               \
                    qFatal("Fatal Error: Accessed global static '%s *%s()' after destruction. " \
                           "Defined at %s:%d", #TYPE, #NAME, __FILE__, __LINE__);  \
                }                                                                  \
                TYPE *x = new TYPE ARGS;                                           \
                if (!_nm_static_##NAME.testAndSetOrdered(0, x)                      \
                        && _nm_static_##NAME != x ) {                                   \
                    delete x;                                                      \
                } else {                                                           \
                    static NmCleanUpGlobalStatic cleanUpObject = { destroy };       \
                }                                                                  \
            }                                                                      \
            return _nm_static_##NAME;                                               \
        }                                                                          \
        inline TYPE &operator*()                                                   \
        {                                                                          \
            return *operator->();                                                  \
        }                                                                          \
        static void destroy()                                                      \
        {                                                                          \
            _nm_static_##NAME##_destroyed = true;                                   \
            TYPE *x = _nm_static_##NAME;                                            \
            _nm_static_##NAME = 0;                                                  \
            delete x;                                                              \
        }                                                                          \
    } NAME;

#endif
