iinterface.h

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/***************************************************************************************************
 * Copyright 2024 NVIDIA Corporation. All rights reserved.
 **************************************************************************************************/
 
#ifndef MI_BASE_IINTERFACE_H
#define MI_BASE_IINTERFACE_H
 
#include <mi/base/types.h>
#include <mi/base/uuid.h>
 
namespace mi {
 
namespace base {
 
// Forward declaration, see below for definition
class IInterface;
 
class IInterface
{
public:
 
    typedef Uuid_t<0,0,0,0,0,0,0,0,0,0,0> IID;
 
    static bool compare_iid( const Uuid& iid)
    {
        return ( iid == IID());
    }
 
    virtual Uint32 retain() const = 0;
 
    virtual Uint32 release() const = 0;
 
    virtual const IInterface* get_interface( const Uuid& interface_id ) const = 0;
 
    template <class T>
    const T* get_interface() const
    {
        return static_cast<const T*>( get_interface( typename T::IID()));
    }
 
    virtual IInterface* get_interface( const Uuid& interface_id ) = 0;
 
    template <class T>
    T* get_interface()
    {
        return static_cast<T*>( get_interface( typename T::IID()));
    }
 
    virtual Uuid get_iid() const = 0;
 
protected:
    // Acquires a const interface.
    //
    // Static helper function for implementing #get_interface(const Uuid&). On #IInterface, the
    // method terminates the recursive call chain.
    //
    // \param iinterface     The interface to act on.
    // \param interface_id   Interface ID of the interface to acquire.
    static const IInterface* get_interface_static(
        const IInterface* iinterface, const Uuid& interface_id)
    {
        if( interface_id == IID()) {
            iinterface->retain();
            return iinterface;
        }
        return 0;
    }
 
    // Acquires a mutable interface.
    //
    // Static helper function for implementing #get_interface(const Uuid&). On #IInterface, the
    // method terminates the recursive call chain.
    //
    // \param iinterface     The interface to act on.
    // \param interface_id   Interface ID of the interface to acquire.
    static IInterface* get_interface_static(
        IInterface* iinterface, const Uuid& interface_id)
    {
        if( interface_id == IID()) {
            iinterface->retain();
            return iinterface;
        }
        return 0;
    }
 
};
 // end group mi_base_iinterface
 
} // namespace base
 
} // namespace mi
 
#endif // MI_BASE_IINTERFACE_H