/*
  Copyright (c) 2014-2015 DataStax

  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  You may obtain a copy of the License at

  http://www.apache.org/licenses/LICENSE-2.0

  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.
*/

#ifndef __CASS_SCOPED_PTR_HPP_INCLUDED__
#define __CASS_SCOPED_PTR_HPP_INCLUDED__

#include "macros.hpp"
#include "ref_counted.hpp"

#include <stddef.h>

namespace cass {

template <class T>
struct DefaultDeleter {
  void operator()(T* ptr) const { delete ptr; }
};

template <class T>
struct DefaultDeleter<T[]> {
  void operator()(T* ptr) const { delete[] ptr; }
};

template <class T, class D = DefaultDeleter<T> >
class ScopedPtr {
public:
  typedef T type;
  typedef D deleter;

  // Prevent RefCounted<> objects from using ScopedPtr<>, that would be bad
  STATIC_ASSERT((!IsConvertible<T, RefCountedBase>::value));

  explicit ScopedPtr(type* ptr = NULL)
      : ptr_(ptr) {}

  ~ScopedPtr() { deleter()(ptr_); }

  void reset(type* ptr = NULL) {
    if (ptr_ != NULL) {
      deleter()(ptr_);
    }
    ptr_ = ptr;
  }

  type* release() {
    type* temp = ptr_;
    ptr_ = NULL;
    return temp;
  }

  type* get() const { return ptr_; }
  type& operator*() const { return *ptr_; }
  type * operator->() const { return ptr_; }
  operator bool() const { return ptr_ != NULL; }

private:
  type* ptr_;

private:
  DISALLOW_COPY_AND_ASSIGN(ScopedPtr);
};

template <class T, class D>
class ScopedPtr<T[], D> {
public:
public:
  typedef T type;
  typedef D deleter;

  explicit ScopedPtr(type* ptr = NULL)
      : ptr_(ptr) {}

  ~ScopedPtr() { deleter()(ptr_); }

  void reset(type* ptr = NULL) {
    if (ptr_ != NULL) {
      deleter()(ptr_);
    }
    ptr_ = ptr;
  }

  type* release() {
    type* temp = ptr_;
    ptr_ = NULL;
    return temp;
  }

  type* get() const { return ptr_; }
  type& operator*() const { return *ptr_; }
  type * operator->() const { return ptr_; }
  operator bool() const { return ptr_ != NULL; }

  type& operator[](size_t index) { return ptr_[index]; }
  type& operator[](size_t index) const { return ptr_[index]; }

private:
  type* ptr_;

private:
  DISALLOW_COPY_AND_ASSIGN(ScopedPtr);
};

} // namespace cass

#endif