////////////////////////////////////////////////////////////////////////////////
/// DISCLAIMER
///
/// Copyright 2014-2016 ArangoDB GmbH, Cologne, Germany
/// Copyright 2004-2014 triAGENS GmbH, Cologne, Germany
///
/// 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.
///
/// Copyright holder is ArangoDB GmbH, Cologne, Germany
///
/// @author Dr. Frank Celler
////////////////////////////////////////////////////////////////////////////////

#ifndef ARANGODB_BASICS_MAKE__UNIQUE_H
#define ARANGODB_BASICS_MAKE__UNIQUE_H 1

#include <cstddef>
#include <memory>
#include <type_traits>
#include <utility>

// VS 2013 and VS 2015 already provide std::make_unique
#ifndef _WIN32

// c++98: 199711 (not supported)
// c++11: 201103 (no std::make_unique)
// c++14: 201402 (std::make_unique included)

#if __cplusplus == 201103L

////////////////////////////////////////////////////////////////////////////////
/// Provide a make_unique() function for C++11 too
/// http://stackoverflow.com/questions/17902405/how-to-implement-make-unique-function-in-c11
////////////////////////////////////////////////////////////////////////////////

namespace std {
template <class T>
struct _Unique_if {
  typedef unique_ptr<T> _Single_object;
};

template <class T>
struct _Unique_if<T[]> {
  typedef unique_ptr<T[]> _Unknown_bound;
};

template <class T, size_t N>
struct _Unique_if<T[N]> {
  typedef void _Known_bound;
};

template <class T, class... Args>
typename _Unique_if<T>::_Single_object make_unique(Args&&... args) {
  return unique_ptr<T>(new T(std::forward<Args>(args)...));
}

template <class T>
typename _Unique_if<T>::_Unknown_bound make_unique(size_t n) {
  typedef typename remove_extent<T>::type U;
  return unique_ptr<T>(new U[n]());
}

template <class T, class... Args>
typename _Unique_if<T>::_Known_bound make_unique(Args&&...) = delete;
}  // namespace std

#endif

#endif

#endif