/*
  Copyright 2019-2021 David Robillard <d@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_STATICWRAPPER_HPP
#define SERD_DETAIL_STATICWRAPPER_HPP

// IWYU pragma: no_include "serd/serd.h"

#include "serd/detail/Wrapper.hpp"

#include <type_traits>

namespace serd {
namespace detail {

/**
   Simple overhead-free deleter for a C object.

   Can be used with const or mutable pointers, but only mutable pointers will
   be freed.  In other words, mutability implies ownership, and this can not
   handle unowned mutable pointers.

   @ingroup serdpp_detail
*/
template<class T, void Free(Mutable<T>*)>
struct StaticDeleter {
  template<class = std::enable_if<!std::is_const<T>::value>>
  void operator()(Mutable<T>* const ptr)
  {
    Free(ptr);
  }

  template<class = std::enable_if<std::is_const<T>::value>>
  void operator()(const T*)
  {}
};

/// Simple overhead-free wrapper for a C object that can free itself
template<class T, void Free(std::remove_const_t<T>*)>
class StaticWrapper : public Wrapper<T, StaticDeleter<T, Free>>
{
public:
  explicit StaticWrapper(T* const ptr)
    : Wrapper<T, StaticDeleter<T, Free>>{ptr}
  {}
};

/**
   Simple overhead-free deleter for a C object.

   Can be used with const or mutable pointers, but only mutable pointers will
   be freed.  In other words, mutability implies ownership, and this can not
   handle unowned mutable pointers.

   @ingroup serdpp_detail
*/
template<class T, void Free(SerdAllocator*, Mutable<T>*)>
struct StaticAllocatedDeleter {
  template<class = std::enable_if<!std::is_const<T>::value>>
  void operator()(Mutable<T>* const ptr)
  {
    Free(nullptr, ptr);
  }

  template<class = std::enable_if<std::is_const<T>::value>>
  void operator()(const T*)
  {}
};

/// Simple overhead-free wrapper for a C object that uses an allocator
template<class T, void Free(SerdAllocator*, std::remove_const_t<T>*)>
class StaticAllocatedWrapper
  : public Wrapper<T, StaticAllocatedDeleter<T, Free>>
{
public:
  explicit StaticAllocatedWrapper(T* const ptr)
    : Wrapper<T, StaticAllocatedDeleter<T, Free>>{ptr}
  {}
};

} // namespace detail
} // namespace serd

#endif // SERD_DETAIL_STATICWRAPPER_HPP