1// This file is part of OpenCV project.
2// It is subject to the license terms in the LICENSE file found in the top-level directory
3// of this distribution and at http://opencv.org/license.html.
4
5#ifndef OPENCV_CORE_CVSTD_WRAPPER_HPP
6#define OPENCV_CORE_CVSTD_WRAPPER_HPP
7
8#include "opencv2/core/cvdef.h"
9
10#include <string>
11#include <memory> // std::shared_ptr
12#include <type_traits> // std::enable_if
13
14namespace cv {
15
16using std::nullptr_t;
17
18//! @addtogroup core_basic
19//! @{
20
21#ifdef CV_DOXYGEN
22
23template <typename _Tp> using Ptr = std::shared_ptr<_Tp>; // In ideal world it should look like this, but we need some compatibility workarounds below
24
25template<typename _Tp, typename ... A1> static inline
26Ptr<_Tp> makePtr(const A1&... a1) { return std::make_shared<_Tp>(a1...); }
27
28#else // cv::Ptr with compatibility workarounds
29
30// It should be defined for C-API types only.
31// C++ types should use regular "delete" operator.
32template<typename Y> struct DefaultDeleter;
33#if 0
34{
35 void operator()(Y* p) const;
36};
37#endif
38
39namespace sfinae {
40template<typename C, typename Ret, typename... Args>
41struct has_parenthesis_operator
42{
43private:
44 template<typename T>
45 static CV_CONSTEXPR std::true_type has_parenthesis_operator_check(typename std::is_same<typename std::decay<decltype(std::declval<T>().operator()(std::declval<Args>()...))>::type, Ret>::type*);
46
47 template<typename> static CV_CONSTEXPR std::false_type has_parenthesis_operator_check(...);
48
49 typedef decltype(has_parenthesis_operator_check<C>(0)) type;
50
51public:
52#if __cplusplus >= 201103L || (defined(_MSC_VER) && _MSC_VER >= 1900/*MSVS 2015*/)
53 static CV_CONSTEXPR bool value = type::value;
54#else
55 // support MSVS 2013
56 static const int value = type::value;
57#endif
58};
59} // namespace sfinae
60
61template <typename T, typename = void>
62struct has_custom_delete
63 : public std::false_type {};
64
65// Force has_custom_delete to std::false_type when NVCC is compiling CUDA source files
66#ifndef __CUDACC__
67template <typename T>
68struct has_custom_delete<T, typename std::enable_if< sfinae::has_parenthesis_operator<DefaultDeleter<T>, void, T*>::value >::type >
69 : public std::true_type {};
70#endif
71
72template<typename T>
73struct Ptr : public std::shared_ptr<T>
74{
75#if 0
76 using std::shared_ptr<T>::shared_ptr; // GCC 5.x can't handle this
77#else
78 inline Ptr() CV_NOEXCEPT : std::shared_ptr<T>() {}
79 inline Ptr(nullptr_t) CV_NOEXCEPT : std::shared_ptr<T>(nullptr) {}
80 template<typename Y, typename D> inline Ptr(Y* p, D d) : std::shared_ptr<T>(p, d) {}
81 template<typename D> inline Ptr(nullptr_t, D d) : std::shared_ptr<T>(nullptr, d) {}
82
83 template<typename Y> inline Ptr(const Ptr<Y>& r, T* ptr) CV_NOEXCEPT : std::shared_ptr<T>(r, ptr) {}
84
85 inline Ptr(const Ptr<T>& o) CV_NOEXCEPT : std::shared_ptr<T>(o) {}
86 inline Ptr(Ptr<T>&& o) CV_NOEXCEPT : std::shared_ptr<T>(std::move(o)) {}
87
88 template<typename Y> inline Ptr(const Ptr<Y>& o) CV_NOEXCEPT : std::shared_ptr<T>(o) {}
89 template<typename Y> inline Ptr(Ptr<Y>&& o) CV_NOEXCEPT : std::shared_ptr<T>(std::move(o)) {}
90#endif
91 inline Ptr(const std::shared_ptr<T>& o) CV_NOEXCEPT : std::shared_ptr<T>(o) {}
92 inline Ptr(std::shared_ptr<T>&& o) CV_NOEXCEPT : std::shared_ptr<T>(std::move(o)) {}
93
94 // Overload with custom DefaultDeleter: Ptr<IplImage>(...)
95 template<typename Y>
96 inline Ptr(const std::true_type&, Y* ptr) : std::shared_ptr<T>(ptr, DefaultDeleter<Y>()) {}
97
98 // Overload without custom deleter: Ptr<std::string>(...);
99 template<typename Y>
100 inline Ptr(const std::false_type&, Y* ptr) : std::shared_ptr<T>(ptr) {}
101
102 template<typename Y = T>
103 inline Ptr(Y* ptr) : Ptr(has_custom_delete<Y>(), ptr) {}
104
105 // Overload with custom DefaultDeleter: Ptr<IplImage>(...)
106 template<typename Y>
107 inline void reset(const std::true_type&, Y* ptr) { std::shared_ptr<T>::reset(ptr, DefaultDeleter<Y>()); }
108
109 // Overload without custom deleter: Ptr<std::string>(...);
110 template<typename Y>
111 inline void reset(const std::false_type&, Y* ptr) { std::shared_ptr<T>::reset(ptr); }
112
113 template<typename Y>
114 inline void reset(Y* ptr) { Ptr<T>::reset(has_custom_delete<Y>(), ptr); }
115
116 template<class Y, class Deleter>
117 void reset(Y* ptr, Deleter d) { std::shared_ptr<T>::reset(ptr, d); }
118
119 void reset() CV_NOEXCEPT { std::shared_ptr<T>::reset(); }
120
121 Ptr& operator=(const Ptr& o) { std::shared_ptr<T>::operator =(o); return *this; }
122 template<typename Y> inline Ptr& operator=(const Ptr<Y>& o) { std::shared_ptr<T>::operator =(o); return *this; }
123
124 T* operator->() const CV_NOEXCEPT { return std::shared_ptr<T>::get();}
125 typename std::add_lvalue_reference<T>::type operator*() const CV_NOEXCEPT { return *std::shared_ptr<T>::get(); }
126
127 // OpenCV 3.x methods (not a part of standard C++ library)
128 inline void release() { std::shared_ptr<T>::reset(); }
129 inline operator T* () const { return std::shared_ptr<T>::get(); }
130 inline bool empty() const { return std::shared_ptr<T>::get() == nullptr; }
131
132 template<typename Y> inline
133 Ptr<Y> staticCast() const CV_NOEXCEPT { return std::static_pointer_cast<Y>(*this); }
134
135 template<typename Y> inline
136 Ptr<Y> constCast() const CV_NOEXCEPT { return std::const_pointer_cast<Y>(*this); }
137
138 template<typename Y> inline
139 Ptr<Y> dynamicCast() const CV_NOEXCEPT { return std::dynamic_pointer_cast<Y>(*this); }
140};
141
142template<typename _Tp, typename ... A1> static inline
143Ptr<_Tp> makePtr(const A1&... a1)
144{
145 static_assert( !has_custom_delete<_Tp>::value, "Can't use this makePtr with custom DefaultDeleter");
146 return (Ptr<_Tp>)std::make_shared<_Tp>(a1...);
147}
148
149#endif // CV_DOXYGEN
150
151//! @} core_basic
152} // cv
153
154#endif //OPENCV_CORE_CVSTD_WRAPPER_HPP
155

source code of opencv/modules/core/include/opencv2/core/cvstd_wrapper.hpp