interfaceFactory.h

Go to the documentation of this file.

//
// Copyright 2016 Pixar
//
// Licensed under the terms set forth in the LICENSE.txt file available at
// https://openusd.org/license.
//
#ifndef PXR_BASE_PLUG_INTERFACE_FACTORY_H
#define PXR_BASE_PLUG_INTERFACE_FACTORY_H
 
 
#include "pxr/pxr.h"
#include "pxr/base/tf/type.h"
 
PXR_NAMESPACE_OPEN_SCOPE
 
// For use by \c PLUG_REGISTER_INTERFACE_SINGLETON_TYPE.
class Plug_InterfaceFactory {
public:
    struct Base : public TfType::FactoryBase {
    public:
        virtual void* New() = 0;
    };
 
    template <class Interface, class Implementation>
    struct SingletonFactory : public Base {
    public:
        virtual void* New()
        {
            static_assert(std::is_abstract<Interface>::value,
                          "Interface type must be abstract.");
            static Implementation impl;
            return static_cast<Interface*>(&impl);
        }
    };
};
 
#define PLUG_REGISTER_INTERFACE_SINGLETON_TYPE(Interface, Implementation)   \
TF_REGISTRY_FUNCTION(TfType)                                                \
{                                                                           \
    TfType::Define<Interface>()                                             \
        .SetFactory<Plug_InterfaceFactory::SingletonFactory<                \
            Interface, Implementation> >();                                 \
}
 
PXR_NAMESPACE_CLOSE_SCOPE
 
#endif // PXR_BASE_PLUG_INTERFACE_FACTORY_H