qcppcastinghelper_p.h

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//
//  W A R N I N G
//  -------------
//
// This file is not part of the Qt API.  It exists purely as an
// implementation detail.  This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.

#ifndef Patternist_CppCastingHelper_H
#define Patternist_CppCastingHelper_H

#include <QtCore/QtGlobal>

QT_BEGIN_HEADER

QT_BEGIN_NAMESPACE

namespace QPatternist
{
    template<typename TSubClass>
    class CppCastingHelper
    {
    public:

        template<typename TCastTarget>
        inline const TCastTarget *as() const
        {
#if defined(Patternist_DEBUG) && !defined(Q_CC_XLC)
/* At least on aix-xlc-64, the compiler cries when it sees dynamic_cast. */
            Q_ASSERT_X(dynamic_cast<const TCastTarget *>(static_cast<const TSubClass *>(this)),
                       Q_FUNC_INFO,
                       "The cast is invalid. This class does not inherit the cast target.");
#endif
            return static_cast<const TCastTarget *>(static_cast<const TSubClass *>(this));
        }

        template<typename TCastTarget>
        inline TCastTarget *as()
        {
#if defined(Patternist_DEBUG) && !defined(Q_CC_XLC)
/* At least on aix-xlc-64, the compiler cries when it sees dynamic_cast. */
            Q_ASSERT_X(dynamic_cast<TCastTarget *>(static_cast<TSubClass *>(this)),
                       Q_FUNC_INFO,
                       "The cast is invalid. This class does not inherit the cast target.");
#endif
            return static_cast<TCastTarget *>(static_cast<TSubClass *>(this));
        }

    protected:
        inline CppCastingHelper() {}
    };
}

QT_END_NAMESPACE

QT_END_HEADER

#endif