format_impl_ptr.hpp

// Copyright (c) 2025 xlnt-community
//
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// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
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// @license: http://www.opensource.org/licenses/mit-license.php
// @author: see AUTHORS file

#pragma once

namespace xlnt {
namespace detail {

struct format_impl;

class XLNT_API format_impl_ptr
{
public:
  format_impl_ptr() = default;
  format_impl_ptr(const format_impl_ptr& r) : format_(r.format_) {increment();}
  format_impl_ptr(format_impl_ptr&& r) : format_(r.format_) {r.format_ = nullptr;}
  format_impl_ptr(format_impl *format) : format_(format) {increment();}
  ~format_impl_ptr() {decrement();}

  format_impl_ptr& operator=(const format_impl_ptr& r)
  {
    if (this == &r)
      return *this;

    decrement();
    format_ = r.format_;
    increment();
    return *this;
  }

  format_impl_ptr& operator=(format_impl_ptr&& r)
  {
    decrement();
    format_ = r.format_;
    r.format_ = nullptr;
    return *this;
  }

  std::size_t use_count () const;

  bool is_set () const {return format_ != nullptr;}
  void clear () {operator=(nullptr);}

  format_impl *get() const {return format_;}
  format_impl *operator->() const {return get();}
  operator format_impl *() const {return get();}

  bool operator== (const format_impl_ptr& r) const {return format_ == r.format_;}
  bool operator== (format_impl *format) const {return format_ == format;}

protected:
  void increment();
  void decrement();

protected:
  format_impl *format_ = nullptr;
};

} // namespace detail
} // namespace xlnt