hal/include/HAL/cpp/make_unique.h

/*----------------------------------------------------------------------------*/
/* Copyright (c) FIRST 2016-2017. All Rights Reserved.                        */
/* Open Source Software - may be modified and shared by FRC teams. The code   */
/* must be accompanied by the FIRST BSD license file in the root directory of */
/* the project.                                                               */
/*----------------------------------------------------------------------------*/

#pragma once

// Define make_unique for C++11-only compilers
#if __cplusplus == 201103L
#include <cstddef>
#include <memory>
#include <type_traits>
#include <utility>

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