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interfaceFactory.h
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1//
2// Copyright 2016 Pixar
3//
4// Licensed under the Apache License, Version 2.0 (the "Apache License")
5// with the following modification; you may not use this file except in
6// compliance with the Apache License and the following modification to it:
7// Section 6. Trademarks. is deleted and replaced with:
8//
9// 6. Trademarks. This License does not grant permission to use the trade
10// names, trademarks, service marks, or product names of the Licensor
11// and its affiliates, except as required to comply with Section 4(c) of
12// the License and to reproduce the content of the NOTICE file.
13//
14// You may obtain a copy of the Apache License at
15//
16// http://www.apache.org/licenses/LICENSE-2.0
17//
18// Unless required by applicable law or agreed to in writing, software
19// distributed under the Apache License with the above modification is
20// distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
21// KIND, either express or implied. See the Apache License for the specific
22// language governing permissions and limitations under the Apache License.
23//
24#ifndef PXR_BASE_PLUG_INTERFACE_FACTORY_H
25#define PXR_BASE_PLUG_INTERFACE_FACTORY_H
26
28
29#include "pxr/pxr.h"
30#include "pxr/base/tf/type.h"
31
32PXR_NAMESPACE_OPEN_SCOPE
33
34// For use by \c PLUG_REGISTER_INTERFACE_SINGLETON_TYPE.
35class Plug_InterfaceFactory {
36public:
37 struct Base : public TfType::FactoryBase {
38 public:
39 virtual void* New() = 0;
40 };
41
42 template <class Interface, class Implementation>
43 struct SingletonFactory : public Base {
44 public:
45 virtual void* New()
46 {
47 static_assert(std::is_abstract<Interface>::value,
48 "Interface type must be abstract.");
49 static Implementation impl;
50 return static_cast<Interface*>(&impl);
51 }
52 };
53};
54
67#define PLUG_REGISTER_INTERFACE_SINGLETON_TYPE(Interface, Implementation) \
68TF_REGISTRY_FUNCTION(TfType) \
69{ \
70 TfType::Define<Interface>() \
71 .SetFactory<Plug_InterfaceFactory::SingletonFactory< \
72 Interface, Implementation> >(); \
73}
74
75PXR_NAMESPACE_CLOSE_SCOPE
76
77#endif // PXR_BASE_PLUG_INTERFACE_FACTORY_H
Base class of all factory types.
Definition: type.h:73