// This file is part of OpenCV project.
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// It is subject to the license terms in the LICENSE file found in the top-level directory
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// of this distribution and at http://opencv.org/license.html.
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#ifndef OPENCV_CORE_CVSTD_WRAPPER_HPP
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#define OPENCV_CORE_CVSTD_WRAPPER_HPP
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#include "opencv2/core/cvdef.h"
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#include <string>
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#include <memory> // std::shared_ptr
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#include <type_traits> // std::enable_if
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namespace cv {
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using std::nullptr_t;
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//! @addtogroup core_basic
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//! @{
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#ifdef CV_DOXYGEN
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template <typename _Tp> using Ptr = std::shared_ptr<_Tp>; // In ideal world it should look like this, but we need some compatibility workarounds below
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template<typename _Tp, typename ... A1> static inline
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Ptr<_Tp> makePtr(const A1&... a1) { return std::make_shared<_Tp>(a1...); }
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#else // cv::Ptr with compatibility workarounds
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// It should be defined for C-API types only.
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// C++ types should use regular "delete" operator.
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template<typename Y> struct DefaultDeleter;
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#if 0
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{
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void operator()(Y* p) const;
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};
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#endif
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namespace sfinae {
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template<typename C, typename Ret, typename... Args>
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struct has_parenthesis_operator
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{
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private:
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template<typename T>
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static CV_CONSTEXPR std::true_type check(typename std::is_same<typename std::decay<decltype(std::declval<T>().operator()(std::declval<Args>()...))>::type, Ret>::type*);
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template<typename> static CV_CONSTEXPR std::false_type check(...);
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typedef decltype(check<C>(0)) type;
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public:
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#if __cplusplus >= 201103L || (defined(_MSC_VER) && _MSC_VER >= 1900/*MSVS 2015*/)
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static CV_CONSTEXPR bool value = type::value;
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#else
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// support MSVS 2013
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static const int value = type::value;
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#endif
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};
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} // namespace sfinae
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template <typename T, typename = void>
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struct has_custom_delete
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: public std::false_type {};
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// Force has_custom_delete to std::false_type when NVCC is compiling CUDA source files
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#ifndef __CUDACC__
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template <typename T>
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struct has_custom_delete<T, typename std::enable_if< sfinae::has_parenthesis_operator<DefaultDeleter<T>, void, T*>::value >::type >
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: public std::true_type {};
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#endif
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template<typename T>
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struct Ptr : public std::shared_ptr<T>
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{
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#if 0
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using std::shared_ptr<T>::shared_ptr; // GCC 5.x can't handle this
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#else
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inline Ptr() CV_NOEXCEPT : std::shared_ptr<T>() {}
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inline Ptr(nullptr_t) CV_NOEXCEPT : std::shared_ptr<T>(nullptr) {}
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template<typename Y, typename D> inline Ptr(Y* p, D d) : std::shared_ptr<T>(p, d) {}
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template<typename D> inline Ptr(nullptr_t, D d) : std::shared_ptr<T>(nullptr, d) {}
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template<typename Y> inline Ptr(const Ptr<Y>& r, T* ptr) CV_NOEXCEPT : std::shared_ptr<T>(r, ptr) {}
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inline Ptr(const Ptr<T>& o) CV_NOEXCEPT : std::shared_ptr<T>(o) {}
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inline Ptr(Ptr<T>&& o) CV_NOEXCEPT : std::shared_ptr<T>(std::move(o)) {}
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template<typename Y> inline Ptr(const Ptr<Y>& o) CV_NOEXCEPT : std::shared_ptr<T>(o) {}
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template<typename Y> inline Ptr(Ptr<Y>&& o) CV_NOEXCEPT : std::shared_ptr<T>(std::move(o)) {}
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#endif
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inline Ptr(const std::shared_ptr<T>& o) CV_NOEXCEPT : std::shared_ptr<T>(o) {}
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inline Ptr(std::shared_ptr<T>&& o) CV_NOEXCEPT : std::shared_ptr<T>(std::move(o)) {}
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// Overload with custom DefaultDeleter: Ptr<IplImage>(...)
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template<typename Y>
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inline Ptr(const std::true_type&, Y* ptr) : std::shared_ptr<T>(ptr, DefaultDeleter<Y>()) {}
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// Overload without custom deleter: Ptr<std::string>(...);
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template<typename Y>
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inline Ptr(const std::false_type&, Y* ptr) : std::shared_ptr<T>(ptr) {}
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template<typename Y = T>
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inline Ptr(Y* ptr) : Ptr(has_custom_delete<Y>(), ptr) {}
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// Overload with custom DefaultDeleter: Ptr<IplImage>(...)
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template<typename Y>
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inline void reset(const std::true_type&, Y* ptr) { std::shared_ptr<T>::reset(ptr, DefaultDeleter<Y>()); }
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// Overload without custom deleter: Ptr<std::string>(...);
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template<typename Y>
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inline void reset(const std::false_type&, Y* ptr) { std::shared_ptr<T>::reset(ptr); }
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template<typename Y>
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inline void reset(Y* ptr) { Ptr<T>::reset(has_custom_delete<Y>(), ptr); }
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template<class Y, class Deleter>
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void reset(Y* ptr, Deleter d) { std::shared_ptr<T>::reset(ptr, d); }
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void reset() CV_NOEXCEPT { std::shared_ptr<T>::reset(); }
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Ptr& operator=(const Ptr& o) { std::shared_ptr<T>::operator =(o); return *this; }
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template<typename Y> inline Ptr& operator=(const Ptr<Y>& o) { std::shared_ptr<T>::operator =(o); return *this; }
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T* operator->() const CV_NOEXCEPT { return std::shared_ptr<T>::get();}
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typename std::add_lvalue_reference<T>::type operator*() const CV_NOEXCEPT { return *std::shared_ptr<T>::get(); }
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// OpenCV 3.x methods (not a part of standard C++ library)
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inline void release() { std::shared_ptr<T>::reset(); }
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inline operator T* () const { return std::shared_ptr<T>::get(); }
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inline bool empty() const { return std::shared_ptr<T>::get() == nullptr; }
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template<typename Y> inline
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Ptr<Y> staticCast() const CV_NOEXCEPT { return std::static_pointer_cast<Y>(*this); }
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template<typename Y> inline
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Ptr<Y> constCast() const CV_NOEXCEPT { return std::const_pointer_cast<Y>(*this); }
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template<typename Y> inline
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Ptr<Y> dynamicCast() const CV_NOEXCEPT { return std::dynamic_pointer_cast<Y>(*this); }
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};
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template<typename _Tp, typename ... A1> static inline
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Ptr<_Tp> makePtr(const A1&... a1)
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{
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static_assert( !has_custom_delete<_Tp>::value, "Can't use this makePtr with custom DefaultDeleter");
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return (Ptr<_Tp>)std::make_shared<_Tp>(a1...);
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}
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#endif // CV_DOXYGEN
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//! @} core_basic
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} // cv
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#endif //OPENCV_CORE_CVSTD_WRAPPER_HPP
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