ceph/src/boost/boost/smart_ptr/make_unique.hpp

   1 /*
   2 Copyright 2012-2015 Glen Joseph Fernandes
   3 (glenjofe@gmail.com)
   4
   5 Distributed under the Boost Software License, Version 1.0.
   6 (http://www.boost.org/LICENSE_1_0.txt)
   7 */
   8 #ifndef BOOST_SMART_PTR_MAKE_UNIQUE_HPP
   9 #define BOOST_SMART_PTR_MAKE_UNIQUE_HPP
  10
  11 #include <boost/config.hpp>
  12 #include <memory>
  13 #include <utility>
  14
  15 namespace boost {
  16 namespace detail {
  17
  18 template<class T>
  19 struct up_if_object {
  20     typedef std::unique_ptr<T> type;
  21 };
  22
  23 template<class T>
  24 struct up_if_object<T[]> { };
  25
  26 template<class T, std::size_t N>
  27 struct up_if_object<T[N]> { };
  28
  29 template<class T>
  30 struct up_if_array { };
  31
  32 template<class T>
  33 struct up_if_array<T[]> {
  34     typedef std::unique_ptr<T[]> type;
  35 };
  36
  37 template<class T>
  38 struct up_remove_reference {
  39     typedef T type;
  40 };
  41
  42 template<class T>
  43 struct up_remove_reference<T&> {
  44     typedef T type;
  45 };
  46
  47 template<class T>
  48 struct up_remove_reference<T&&> {
  49     typedef T type;
  50 };
  51
  52 template<class T>
  53 struct up_element { };
  54
  55 template<class T>
  56 struct up_element<T[]> {
  57     typedef T type;
  58 };
  59
  60 } /* detail */
  61
  62 template<class T>
  63 inline typename detail::up_if_object<T>::type
  64 make_unique()
  65 {
  66     return std::unique_ptr<T>(new T());
  67 }
  68
  69 #if !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES)
  70 template<class T, class... Args>
  71 inline typename detail::up_if_object<T>::type
  72 make_unique(Args&&... args)
  73 {
  74     return std::unique_ptr<T>(new T(std::forward<Args>(args)...));
  75 }
  76 #endif
  77
  78 template<class T>
  79 inline typename detail::up_if_object<T>::type
  80 make_unique(typename detail::up_remove_reference<T>::type&& value)
  81 {
  82     return std::unique_ptr<T>(new T(std::move(value)));
  83 }
  84
  85 template<class T>
  86 inline typename detail::up_if_object<T>::type
  87 make_unique_noinit()
  88 {
  89     return std::unique_ptr<T>(new T);
  90 }
  91
  92 template<class T>
  93 inline typename detail::up_if_array<T>::type
  94 make_unique(std::size_t size)
  95 {
  96     return std::unique_ptr<T>(new typename
  97         detail::up_element<T>::type[size]());
  98 }
  99
 100 template<class T>
 101 inline typename detail::up_if_array<T>::type
 102 make_unique_noinit(std::size_t size)
 103 {
 104     return std::unique_ptr<T>(new typename
 105         detail::up_element<T>::type[size]);
 106 }
 107
 108 } /* boost */
 109
 110 #endif