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+/*
+ Copyright 2019-2020 David Robillard <http://drobilla.net>
+
+ Permission to use, copy, modify, and/or distribute this software for any
+ purpose with or without fee is hereby granted, provided that the above
+ copyright notice and this permission notice appear in all copies.
+
+ THIS SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+*/
+
+#ifndef SERD_DETAIL_COPYABLE_HPP
+#define SERD_DETAIL_COPYABLE_HPP
+
+#include "serd/detail/Wrapper.hpp"
+
+#include <cstddef>
+#include <memory>
+#include <type_traits>
+
+namespace serd {
+namespace detail {
+
+/// Copy function for a C object
+template <class T>
+using CopyFunc = T* (*)(const T*);
+
+template <class T, Mutable<T>* Copy(const T*)>
+typename std::enable_if<std::is_const<T>::value, T>::type*
+copy(const T* ptr)
+{
+ return ptr; // Making a view (const reference), do not copy
+}
+
+template <class T, Mutable<T>* Copy(const T*)>
+typename std::enable_if<!std::is_const<T>::value, T>::type*
+copy(const T* ptr)
+{
+ return Copy(ptr); // Making a mutable wrapper, copy
+}
+
+template <class T,
+ Mutable<T>* Copy(const T*),
+ bool Equals(const T*, const T*),
+ void Free(Mutable<T>*)>
+class BasicCopyable : public Wrapper<T, BasicDeleter<T, Free>>
+{
+public:
+ using Deleter = BasicDeleter<T, Free>;
+ using Base = Wrapper<T, Deleter>;
+
+ explicit BasicCopyable(T* ptr) : Base{ptr} {}
+
+ BasicCopyable(const BasicCopyable& wrapper)
+ : Base(copy<T, Copy>(wrapper.cobj()))
+ {
+ }
+
+ template <class U, void UFree(Mutable<U>*)>
+ explicit BasicCopyable(const BasicCopyable<U, Copy, Equals, UFree>& wrapper)
+ : Base(copy<T, Copy>(wrapper.cobj()))
+ {
+ }
+
+ BasicCopyable(BasicCopyable&&) noexcept = default;
+ ~BasicCopyable() noexcept = default;
+
+ BasicCopyable& operator=(BasicCopyable&&) noexcept = default;
+
+ BasicCopyable& operator=(const BasicCopyable& wrapper)
+ {
+ if (&wrapper != this) {
+ this->_ptr =
+ std::unique_ptr<T, Deleter>(copy<T, Copy>(wrapper.cobj()));
+ }
+ return *this;
+ }
+
+ template <class U>
+ bool operator==(const BasicCopyable<U, Copy, Equals, Free>& wrapper) const
+ {
+ return Equals(this->cobj(), wrapper.cobj());
+ }
+
+ template <class U>
+ bool operator!=(const BasicCopyable<U, Copy, Equals, Free>& wrapper) const
+ {
+ return !operator==(wrapper);
+ }
+};
+
+/// Generic C++ wrapper for a copyable C object
+template <class T,
+ Mutable<T>* Copy(const T*),
+ bool Equals(const T*, const T*),
+ void Free(Mutable<T>*)>
+class DynamicCopyable : public Wrapper<T, DynamicDeleter<T, Free>>
+{
+public:
+ using Deleter = DynamicDeleter<T, Free>;
+ using Base = Wrapper<T, Deleter>;
+ using UPtr = typename Base::UPtr;
+
+ explicit DynamicCopyable(UPtr ptr) : Base(std::move(ptr)) {}
+
+ DynamicCopyable(const DynamicCopyable& wrapper)
+ : Base(Copy(wrapper.cobj()), Ownership::owned)
+ {
+ }
+
+ DynamicCopyable(DynamicCopyable&&) noexcept = default;
+ DynamicCopyable& operator=(DynamicCopyable&&) noexcept = default;
+
+ ~DynamicCopyable() noexcept = default;
+
+ DynamicCopyable& operator=(const DynamicCopyable& wrapper)
+ {
+ if (&wrapper != this) {
+ this->_ptr = std::unique_ptr<T, Deleter>(Copy(wrapper.cobj()),
+ Ownership::owned);
+ }
+
+ return *this;
+ }
+
+ template <class U>
+ bool operator==(const DynamicCopyable<U, Copy, Equals, Free>& wrapper) const
+ {
+ return Equals(this->cobj(), wrapper.cobj());
+ }
+
+ template <class U>
+ bool operator!=(const DynamicCopyable<U, Copy, Equals, Free>& wrapper) const
+ {
+ return !operator==(wrapper);
+ }
+
+protected:
+ explicit DynamicCopyable(std::nullptr_t) : Base(nullptr) {}
+};
+
+} // namespace detail
+} // namespace serd
+
+#endif // SERD_DETAIL_COPYABLE_HPP