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// 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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//
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// Copyright (C) 2018 Intel Corporation
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#ifndef OPENCV_GAPI_UTIL_ANY_HPP
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#define OPENCV_GAPI_UTIL_ANY_HPP
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#include <memory>
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#include <type_traits>
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#include <typeinfo>
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#include <utility>
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#include <opencv2/gapi/util/throw.hpp>
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#if defined(_MSC_VER)
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// disable MSVC warning on "multiple copy constructors specified"
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#pragma warning(push)
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# pragma warning(disable: 4521)
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#endif
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namespace cv
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{
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namespace internal
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{
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template <class T, class Source>
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T down_cast(Source operand)
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{
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#if defined(__GXX_RTTI) || defined(_CPPRTTI)
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return dynamic_cast<T>(operand);
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#else
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#ifdef __GNUC__
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#warning used static cast instead of dynamic because RTTI is disabled
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#else
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#pragma message("WARNING: used static cast instead of dynamic because RTTI is disabled")
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#endif
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return static_cast<T>(operand);
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#endif
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}
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}
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namespace util
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{
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class bad_any_cast : public std::bad_cast
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{
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public:
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virtual const char* what() const noexcept override
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{
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return "Bad any cast";
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}
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};
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//modeled against C++17 std::any
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class any
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{
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private:
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struct holder;
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using holder_ptr = std::unique_ptr<holder>;
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struct holder
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{
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virtual holder_ptr clone() = 0;
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virtual ~holder() = default;
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};
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template <typename value_t>
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struct holder_impl : holder
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{
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value_t v;
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template<typename arg_t>
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holder_impl(arg_t&& a) : v(std::forward<arg_t>(a)) {}
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holder_ptr clone() override { return holder_ptr(new holder_impl (v));}
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};
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holder_ptr hldr;
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public:
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template<class value_t>
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any(value_t&& arg) : hldr(new holder_impl<typename std::decay<value_t>::type>( std::forward<value_t>(arg))) {}
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any(any const& src) : hldr( src.hldr ? src.hldr->clone() : nullptr) {}
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//simple hack in order not to write enable_if<not any> for the template constructor
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any(any & src) : any (const_cast<any const&>(src)) {}
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any() = default;
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any(any&& ) = default;
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any& operator=(any&&) = default;
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any& operator=(any const& src)
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{
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any copy(src);
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swap(*this, copy);
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return *this;
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}
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template<class value_t>
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friend value_t* any_cast(any* operand);
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template<class value_t>
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friend const value_t* any_cast(const any* operand);
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template<class value_t>
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friend value_t& unsafe_any_cast(any& operand);
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template<class value_t>
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friend const value_t& unsafe_any_cast(const any& operand);
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friend void swap(any & lhs, any& rhs)
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{
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swap(lhs.hldr, rhs.hldr);
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}
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};
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template<class value_t>
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value_t* any_cast(any* operand)
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{
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auto casted = internal::down_cast<any::holder_impl<typename std::decay<value_t>::type> *>(operand->hldr.get());
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if (casted){
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return & (casted->v);
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}
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return nullptr;
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}
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template<class value_t>
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const value_t* any_cast(const any* operand)
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{
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auto casted = internal::down_cast<any::holder_impl<typename std::decay<value_t>::type> *>(operand->hldr.get());
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if (casted){
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return & (casted->v);
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}
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return nullptr;
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}
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template<class value_t>
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value_t& any_cast(any& operand)
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{
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auto ptr = any_cast<value_t>(&operand);
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if (ptr)
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{
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return *ptr;
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}
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throw_error(bad_any_cast());
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}
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template<class value_t>
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const value_t& any_cast(const any& operand)
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{
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auto ptr = any_cast<value_t>(&operand);
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if (ptr)
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{
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return *ptr;
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}
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throw_error(bad_any_cast());
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}
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template<class value_t>
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inline value_t& unsafe_any_cast(any& operand)
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{
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#ifdef DEBUG
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return any_cast<value_t>(operand);
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#else
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return static_cast<any::holder_impl<typename std::decay<value_t>::type> *>(operand.hldr.get())->v;
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#endif
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}
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template<class value_t>
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inline const value_t& unsafe_any_cast(const any& operand)
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{
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#ifdef DEBUG
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return any_cast<value_t>(operand);
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#else
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return static_cast<any::holder_impl<typename std::decay<value_t>::type> *>(operand.hldr.get())->v;
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#endif
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}
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} // namespace util
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} // namespace cv
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#if defined(_MSC_VER)
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// Enable "multiple copy constructors specified" back
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# pragma warning(pop)
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#endif
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#endif // OPENCV_GAPI_UTIL_ANY_HPP
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