Utility.hpp

   1 /* Cycript - The Truly Universal Scripting Language
   2  * Copyright (C) 2009-2016  Jay Freeman (saurik)
   3 */
   4
   5 /* GNU Affero General Public License, Version 3 {{{ */
   6 /*
   7  * This program is free software: you can redistribute it and/or modify
   8  * it under the terms of the GNU Affero General Public License as published by
   9  * the Free Software Foundation, either version 3 of the License, or
  10  * (at your option) any later version.
  11
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU Affero General Public License for more details.
  16
  17  * You should have received a copy of the GNU Affero General Public License
  18  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19 **/
  20 /* }}} */
  21
  22 #ifndef CYCRIPT_UTILITY_HPP
  23 #define CYCRIPT_UTILITY_HPP
  24
  25 // XXX: this is required because Apple is bad at developer tools (I hate them so much)
  26
  27 namespace cy {
  28
  29 template <class T> struct is_lvalue_reference      { static const bool value = false; };
  30 template <class T> struct is_lvalue_reference<T &> { static const bool value = true; };
  31
  32 template <class T> struct remove_reference       { typedef T type; };
  33 template <class T> struct remove_reference<T &>  { typedef T type; };
  34 template <class T> struct remove_reference<T &&> { typedef T type; };
  35
  36 template <class T>
  37 inline T &&Forward(typename cy::remove_reference<T>::type &t) noexcept {
  38     return static_cast<T &&>(t);
  39 }
  40
  41 template <class T>
  42 inline T &&Forward(typename cy::remove_reference<T>::type &&t) noexcept {
  43     static_assert(!cy::is_lvalue_reference<T>::value, "Can not forward an rvalue as an lvalue.");
  44     return static_cast<T &&>(t);
  45 }
  46
  47 template<class T>
  48 inline typename cy::remove_reference<T>::type &&Move(T &&t) {
  49     return static_cast<typename cy::remove_reference<T>::type &&>(t);
  50 }
  51
  52 template<bool B, typename T = void> struct EnableIf {};
  53 template<typename T>                struct EnableIf<true, T> { typedef T type; };
  54
  55 }
  56
  57 #endif/*CYCRIPT_UTILITY_HPP*/