kernel.h

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/* (c) Magnus Auvinen. See licence.txt in the root of the distribution for more information. */
/* If you are missing that file, acquire a complete release at teeworlds.com.                */
#ifndef ENGINE_KERNEL_H
#define ENGINE_KERNEL_H
 
class IKernel;
class IInterface;
 
class IInterface
{
    // friend with the kernel implementation
    friend class CKernel;
    IKernel *m_pKernel;
 
protected:
    IKernel *Kernel() { return m_pKernel; }
 
public:
    IInterface() :
        m_pKernel(nullptr) {}
    virtual void Shutdown() {}
    virtual ~IInterface() = default;
};
 
#define MACRO_INTERFACE(Name) \
public: \
    static const char *InterfaceName() { return Name; } \
\
private:
 
// This kernel thingie makes the structure very flat and basically singletons.
// I'm not sure if this is a good idea but it works for now.
class IKernel
{
    // hide the implementation
    virtual void RegisterInterfaceImpl(const char *pInterfaceName, IInterface *pInterface, bool Destroy) = 0;
    virtual void ReregisterInterfaceImpl(const char *pInterfaceName, IInterface *pInterface) = 0;
    virtual IInterface *RequestInterfaceImpl(const char *pInterfaceName) = 0;
 
public:
    static IKernel *Create();
    virtual void Shutdown() = 0;
    virtual ~IKernel() = default;
 
    // templated access to handle pointer conversions and interface names
    template<class TINTERFACE>
    void RegisterInterface(TINTERFACE *pInterface, bool Destroy = true)
    {
        RegisterInterfaceImpl(TINTERFACE::InterfaceName(), pInterface, Destroy);
    }
    template<class TINTERFACE>
    void ReregisterInterface(TINTERFACE *pInterface)
    {
        ReregisterInterfaceImpl(TINTERFACE::InterfaceName(), pInterface);
    }
 
    // Usage example:
    //      IMyInterface *pMyHandle = Kernel()->RequestInterface<IMyInterface>()
    template<class TINTERFACE>
    TINTERFACE *RequestInterface()
    {
        return reinterpret_cast<TINTERFACE *>(RequestInterfaceImpl(TINTERFACE::InterfaceName()));
    }
};
 
#endif