#ifndef MARISA_SCOPED_PTR_H_

#define MARISA_SCOPED_PTR_H_

#include "base.h"

namespace marisa {

template <typename T>

class scoped_ptr {

 public:

  scoped_ptr() : ptr_(NULL) {}

  explicit scoped_ptr(T *ptr) : ptr_(ptr) {}

  ~scoped_ptr() {

    delete ptr_;

  }

  void reset(T *ptr = NULL) {

    MARISA_THROW_IF((ptr != NULL) && (ptr == ptr_), MARISA_RESET_ERROR);

    scoped_ptr(ptr).swap(*this);

  }

  T &operator*() const {

    MARISA_DEBUG_IF(ptr_ == NULL, MARISA_STATE_ERROR);

    return *ptr_;

  }

  T *operator->() const {

    MARISA_DEBUG_IF(ptr_ == NULL, MARISA_STATE_ERROR);

    return ptr_;

  }

  T *get() const {

    return ptr_;

  }

  void clear() {

    scoped_ptr().swap(*this);

  }

  void swap(scoped_ptr &rhs) {

    marisa::swap(ptr_, rhs.ptr_);

  }

 private:

  T *ptr_;

  // Disallows copy and assignment.

  scoped_ptr(const scoped_ptr &);

  scoped_ptr &operator=(const scoped_ptr &);

};

}  // namespace marisa

#endif  // MARISA_SCOPED_PTR_H_