Functor.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 FUNCTOR_HPP
  23 #define FUNCTOR_HPP
  24
  25 template <typename Function_>
  26 class Functor;
  27
  28 template <typename Type_, typename... Args_>
  29 class Functor<Type_ (Args_...)> {
  30   public:
  31     virtual Type_ operator ()(Args_... args) const = 0;
  32 };
  33
  34 template <typename Function_>
  35 class FunctorImpl;
  36
  37 template <typename Value_, typename Type_, typename... Args_>
  38 class FunctorImpl<Type_ (Value_::*)(Args_...) const> :
  39     public Functor<Type_ (Args_...)>
  40 {
  41   private:
  42     const Value_ *value_;
  43
  44   public:
  45     FunctorImpl(const Value_ &value) :
  46         value_(&value)
  47     {
  48     }
  49
  50     virtual Type_ operator ()(Args_... args) const {
  51         return (*value_)(args...);
  52     }
  53 };
  54
  55 template <typename Function_>
  56 FunctorImpl<decltype(&Function_::operator())> fun(const Function_ &value) {
  57     return value;
  58 }
  59
  60 #endif//FUNCTOR_HPP