/*
  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_DYNAMICWRAPPER_HPP
#define SERD_DETAIL_DYNAMICWRAPPER_HPP

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

#include "serd/detail/Wrapper.hpp"

#include <type_traits>

namespace serd {
namespace detail {

/**
   Ownership for `DynamicDeleter`.

   @ingroup serdpp_detail
*/
enum class Ownership {
  owned, ///< This pointer owns the data and must delete it
  view,  ///< This pointer is just a view and must not delete the data
};

/**
   Deleter for a C object that can handle dynamic ownership.

   Unlike StaticDeleter, this can be used to handle non-owned references to
   mutable objects, at the cost of an extra word for tracking the ownership
   (since constness in the type can't convey this information).

   @ingroup serdpp_detail
*/
template<class T, void Free(Mutable<T>*)>
struct DynamicDeleter {
  // NOLINTNEXTLINE(google-explicit-constructor, hicpp-explicit-conversions)
  DynamicDeleter(const Ownership ownership)
    : _ownership{ownership}
  {}

  template<class = std::enable_if<!std::is_const<T>::value>>
  void operator()(Mutable<T>* const ptr)
  {
    if (_ownership == Ownership::owned) {
      Free(ptr);
    }
  }

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

private:
  Ownership _ownership;
};

} // namespace detail
} // namespace serd

#endif // SERD_DETAIL_DYNAMICWRAPPER_HPP