functional.h

00001 ///\file
00002 
00003 /******************************************************************************
00004 The MIT License(MIT)
00005 
00006 Embedded Template Library.
00007 https://github.com/ETLCPP/etl
00008 http://www.etlcpp.com
00009 
00010 Copyright(c) 2014 jwellbelove
00011 
00012 Permission is hereby granted, free of charge, to any person obtaining a copy
00013 of this software and associated documentation files(the "Software"), to deal
00014 in the Software without restriction, including without limitation the rights
00015 to use, copy, modify, merge, publish, distribute, sublicense, and / or sell
00016 copies of the Software, and to permit persons to whom the Software is
00017 furnished to do so, subject to the following conditions :
00018 
00019 The above copyright notice and this permission notice shall be included in all
00020 copies or substantial portions of the Software.
00021 
00022 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
00023 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
00024 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.IN NO EVENT SHALL THE
00025 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
00026 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
00027 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
00028 SOFTWARE.
00029 ******************************************************************************/
00030 
00031 #ifndef __ETL_FUNCTIONAL__
00032 #define __ETL_FUNCTIONAL__
00033 
00034 #include "platform.h "
00035 
00036 ///\defgroup functional functional
00037 ///\ingroup utilities
00038 
00039 ///\defgroup reference_wrapper reference_wrapper
00040 ///\ingroup functional
00041 
00042 namespace etl
00043 {
00044   //***************************************************************************
00045   /// A definition of reference_wrapper for those that don't have C++ 0x11 support.
00046   ///\ingroup reference
00047   //***************************************************************************
00048   template <typename T>
00049   class reference_wrapper
00050   {
00051   public:
00052 
00053     typedef T type;
00054 
00055     explicit reference_wrapper(T& t_)
00056       : t(&t_)
00057     {
00058     }
00059 
00060     operator T& () const
00061     {
00062       return *t;
00063     }
00064 
00065     reference_wrapper<T>& operator = (T value)
00066     {
00067       *t = value;
00068       return *this;
00069     }
00070     
00071     T& get() const
00072     {
00073       return *t;
00074     }
00075 
00076   private:
00077 
00078     T* t;
00079   };
00080 
00081   //***************************************************************************
00082   template <typename T>
00083   reference_wrapper<T> ref(T& t)
00084   {
00085     return reference_wrapper<T>(t);
00086   }
00087 
00088   //***************************************************************************
00089   template <typename T>
00090   reference_wrapper<T> ref(reference_wrapper<T> t)
00091   {
00092     return reference_wrapper<T>(t.get());
00093   }
00094 
00095   //***************************************************************************
00096   template <typename T>
00097   reference_wrapper<const T> cref(const T& t)
00098   {
00099     return reference_wrapper<const T>(t);
00100   }
00101 
00102   //***************************************************************************
00103   template <typename T>
00104   reference_wrapper<const T> cref(reference_wrapper<T> t)
00105   {
00106     return reference_wrapper<const T>(t.get());
00107   }
00108 }
00109 
00110 #endif
00111 
00112