interface_implement.h File Reference

‎/***************************************************************************************************
 * Copyright 2023 NVIDIA Corporation. All rights reserved.
 **************************************************************************************************/

#ifndef MI_BASE_INTERFACE_IMPLEMENT_H
#define MI_BASE_INTERFACE_IMPLEMENT_H

#include <mi/base/types.h>
#include <mi/base/uuid.h>
#include <mi/base/atom.h>

namespace mi {
namespace base {

// Forward declaration
class IInterface;

template <class I>
class Interface_implement : public I
{
public:
    typedef I Interface;

    Interface_implement( Uint32 initial=1)
        : m_refcnt( initial)
    {
    }

    Interface_implement( const Interface_implement< I>& other)
        : m_refcnt( 1)
    {
        // avoid warning
        (void) other;
    }

    Interface_implement< I>& operator=( const Interface_implement< I>& other)
    {
        // Note: no call of operator= on m_refcount
        // avoid warning
        (void) other;
        return *this;
    }

#if (__cplusplus >= 201103L)
    Interface_implement(Interface_implement&& other)
    : m_refcnt{other.m_refcnt.swap(0)}
    {
    }

    Interface_implement& operator=(Interface_implement&& other)
    {
        other.m_refcnt = m_refcnt.swap(other.m_refcnt);
        return *this;
    }
#endif

    virtual Uint32 retain() const
    {
        return ++m_refcnt;
    }

    virtual Uint32 release() const
    {
        Uint32 cnt = --m_refcnt;
        if( !cnt)
            delete this;
        return cnt;
    }

    virtual const IInterface* get_interface( const Uuid& interface_id) const
    {
        return I::get_interface_static( this, interface_id);
    }

    virtual IInterface* get_interface( const Uuid& interface_id)
    {
        return I::get_interface_static( this, interface_id);
    }

    using I::get_interface;

    Uuid 
               get_iid() const
    {
        return typename I::IID();
    }

protected:
    Atom32& refcount() const { return m_refcnt; }

protected:
    virtual ~Interface_implement() {}

private:
    mutable Atom32 m_refcnt;
};


template <class I1, class I2>
class Interface_implement_2 : public I1, public I2
{
public:
    Interface_implement_2( Uint32 initial=1)
        : m_refcnt( initial)
    {
    }

    Interface_implement_2( const Interface_implement_2< I1, I2>& other)
        : m_refcnt( 1)
    {
        // avoid warning
        (void) other;
    }

    Interface_implement_2< I1, I2>& operator=( const Interface_implement_2< I1, I2>& other)
    {
        // Note: no call of operator= on m_refcount
        // avoid warning
        (void) other;
        return *this;
    }

    virtual Uint32 
               retain() const
    {
        return ++m_refcnt;
    }

    virtual Uint32 
               release() const
    {
        Uint32 cnt = --m_refcnt;
        if( !cnt)
            delete this;
        return cnt;
    }

    virtual const IInterface* get_interface( const Uuid& interface_id) const
    {
        const IInterface* iptr = I1::get_interface_static( static_cast<const I1*>(this),
                                                           interface_id);
        if ( iptr == 0)
            iptr = I2::get_interface_static( static_cast<const I2*>(this), interface_id);
        return iptr;
    }

    virtual IInterface* get_interface( const Uuid& interface_id)
    {
        IInterface* iptr = I1::get_interface_static(static_cast<I1*>(this),interface_id);
        if ( iptr == 0)
            iptr = I2::get_interface_static( static_cast<I2*>(this), interface_id);
        return iptr;
    }

    using I1::get_interface;

    Uuid 
               get_iid() const
    {
        return typename I1::IID();
    }

protected:
    virtual ~Interface_implement_2() {}

private:
    mutable Atom32 m_refcnt;
};


template <class I>
class Interface_implement_singleton : public I
{
public:
    virtual Uint32 
               retain() const
    {
        return 1;
    }

    virtual Uint32 
               release() const
    {
        return 1;
    }

    virtual const IInterface* get_interface( const Uuid& interface_id) const
    {
        return I::get_interface_static( this, interface_id);
    }

    virtual IInterface* get_interface( const Uuid& interface_id)
    {
        return I::get_interface_static( this, interface_id);
    }

    using I::get_interface;

    Uuid 
               get_iid() const
    {
        return typename I::IID();
    }

protected:
    virtual ~Interface_implement_singleton() {}
};

 // end group mi_base_iinterface

} // namespace base
} // namespace mi

#endif // MI_BASE_INTERFACE_IMPLEMENT_H