Rene Greiner / Mbed 2 deprecated FunctionPointers

Modified version of Andy Kirkhams FPointer.h http://mbed.org/users/AjK/libraries/FPointer/ll7nhv Advantages: - reduced size of from 12 -> 8 byte by usage of a unnamed union - speedup function call by removing one error check - replaced call() function by () operator - templated: you can define the return and argument types - implementations provided for 1 and 2 arguments, easy extendable to more arguments

Dependencies:   mbed

FunctionPointers.h@0:e62fc62bc488, 2011-12-11 (annotated)

Committer:
Renegr
Date:
Sun Dec 11 22:04:59 2011 +0000
Revision:
0:e62fc62bc488

        

        
Who changed what in which revision?

        

            
                
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/* FunctionPointers.h





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 * Modified version of Andy Kirkhams FPointer.h





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 * http://mbed.org/users/AjK/libraries/FPointer/ll7nhv





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 * Advantages:





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 * - reduced size of from 12 -> 8 byte by usage of a unnamed union





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 * - speedup function call by removing one error check





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 * - replaced call() function by () operator





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 * - templated: you can define the return and argument types





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 * - implementations for 1 and 2 arguments, easy extendable to more arguments





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 * Disadvantage:





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 * - do NOT call operator() without an attached callback function





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 */ 





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#ifndef FUNCTIONPOINTERS_H 





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#define FUNCTIONPOINTERS_H 





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template<class Tret=void>





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class FPtrRetT {





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public:





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    FPtrRetT() : obj_callback( NULL), c_callback( NULL)  {





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    }





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    void attach(Tret (*function)()) {





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        c_callback = function;





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    }





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    template<class T>





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    void attach(T& item, Tret (T::*method)()) {





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        obj_callback    = reinterpret_cast<FPtrDummy*>(&item);





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        method_callback = reinterpret_cast<Tret (FPtrDummy::*)()>(method);





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    }





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    Tret operator()() const {





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        return obj_callback ? (obj_callback->*method_callback)() : (*c_callback)();





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    }





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private:





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    class FPtrDummy;





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    FPtrDummy  *obj_callback;





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    union {





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        Tret (*c_callback)();





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        Tret (FPtrDummy::*method_callback)();





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    };





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};





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template<class Tret, class Targ1>





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class FPtr1ArgT {





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public:





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    FPtr1ArgT() : obj_callback( NULL), c_callback( NULL)  {





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    }





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    void attach(Tret (*function)(Targ1)) {





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        c_callback = function;





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    }





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    template<class T>





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    void attach(T& item, Tret (T::*method)(Targ1)) {





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        obj_callback    = reinterpret_cast<FPtrDummy*>(&item);





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        method_callback = reinterpret_cast<Tret (FPtrDummy::*)(Targ1)>(method);





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    }





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    Tret operator()(Targ1 arg1) const {





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        return obj_callback ? (obj_callback->*method_callback)(arg1) : (*c_callback)(arg1);





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    }





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private:





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    class FPtrDummy;





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    FPtrDummy  *obj_callback;





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    union {





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        Tret (*c_callback)(Targ1);





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        Tret (FPtrDummy::*method_callback)(Targ1);





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    };





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};





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template<class Tret, class Targ1, class Targ2>





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class FPtr2ArgT {





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public:





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    FPtr2ArgT() : obj_callback( NULL), c_callback( NULL)  {





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    }





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    void attach(Tret (*function)(Targ1,Targ2)) {





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        c_callback = function;





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    }





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    template<class T>





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    void attach(T& item, Tret (T::*method)(Targ1,Targ2)) {





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        obj_callback    = reinterpret_cast<FPointerDummy*>(&item);





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        method_callback = reinterpret_cast<Tret (FPtrDummy::*)(Targ1,Targ2)>(method);





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    }





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    Tret operator()(Targ1 arg1, Targ2 arg2) const {





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        return obj_callback ? (obj_callback->*method_callback)(arg1, arg2) : (*c_callback)(arg1, arg2);





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    }





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private:





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    class FPtrDummy;





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    FPtrDummy  *obj_callback;





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    union {





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        Tret (*c_callback)(Targ1,Targ2);





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        Tret (FPtrDummy::*method_callback)(Targ1,Targ2);





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    };





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};





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#endif