rendererPluginHandle.h

//
// Copyright 2020 Pixar
//
// Licensed under the terms set forth in the LICENSE.txt file available at
// https://openusd.org/license.
//
#ifndef PXR_IMAGING_HD_RENDERER_PLUGIN_HANDLE_H
#define PXR_IMAGING_HD_RENDERER_PLUGIN_HANDLE_H
 
#include "pxr/pxr.h"
#include "pxr/imaging/hd/api.h"
#include "pxr/imaging/hd/renderDelegate.h"
 
#include "pxr/base/tf/token.h"
 
#include <cstddef>
 
PXR_NAMESPACE_OPEN_SCOPE
 
class HdRendererPlugin;
class HdPluginRenderDelegateUniqueHandle;
 
class HdRendererPluginHandle final
{
public:
    HdRendererPluginHandle() : _plugin(nullptr) { }
    HdRendererPluginHandle(const std::nullptr_t &) : _plugin(nullptr) { }
 
    HD_API
    HdRendererPluginHandle(const HdRendererPluginHandle &);
 
    HD_API
    HdRendererPluginHandle(HdRendererPluginHandle &&);
 
    HD_API
    ~HdRendererPluginHandle();
 
    HD_API
    HdRendererPluginHandle &operator=(const HdRendererPluginHandle &);
 
    HD_API
    HdRendererPluginHandle &operator=(HdRendererPluginHandle &&);
 
    HD_API
    HdRendererPluginHandle &operator=(const std::nullptr_t &);
    
    HdRendererPlugin *Get() const { return _plugin; }
 
    HdRendererPlugin *operator->() const { return _plugin; }
    HdRendererPlugin &operator*() const { return *_plugin; }
 
    explicit operator bool() const { return _plugin; }
 
private:
    friend class HdRendererPluginRegistry;
    friend class HdRendererPlugin;
    
    HdRendererPluginHandle(HdRendererPlugin * const plugin)
      : _plugin(plugin) { }
 
    HdRendererPlugin *_plugin;
};
 
PXR_NAMESPACE_CLOSE_SCOPE
 
#endif