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cxxCast.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_TF_CXX_CAST_H
25#define PXR_BASE_TF_CXX_CAST_H
26
29
30#ifndef __cplusplus
31#error This include file can only be included in C++ programs.
32#endif
33
34#include "pxr/pxr.h"
35#include <type_traits>
36
37PXR_NAMESPACE_OPEN_SCOPE
38
39template <class Src, class Dst>
40using Tf_CopyConst =
41 typename std::conditional<std::is_const<Src>::value,
42 typename std::add_const<Dst>::type, Dst>::type;
43
44template <class Src, class Dst>
45using Tf_CopyVolatile =
46 typename std::conditional<std::is_volatile<Src>::value,
47 typename std::add_volatile<Dst>::type, Dst>::type;
48
49template <class Src, class Dst>
50using Tf_CopyCV = Tf_CopyConst<Src, Tf_CopyVolatile<Src, Dst>>;
51
64template <typename T>
65inline typename std::enable_if<
66 std::is_polymorphic<T>::value, Tf_CopyCV<T, void>*>::type
68{
69 return dynamic_cast<Tf_CopyCV<T, void>*>(ptr);
70}
71
72template <typename T>
73inline typename std::enable_if<
74 !std::is_polymorphic<T>::value, Tf_CopyCV<T, void>*>::type
76{
77 return static_cast<Tf_CopyCV<T, void>*>(ptr);
78}
79
80PXR_NAMESPACE_CLOSE_SCOPE
81
82#endif
std::enable_if< std::is_polymorphic< T >::value, Tf_CopyCV< T, void > * >::type TfCastToMostDerivedType(T *ptr)
Return a pointer to the most-derived object.
Definition: cxxCast.h:67