libs/delegate.h

   1 /* Quarn OS
   2  *
   3  * Delegates
   4  *
   5  * Copyright (C) 2008-2009 Pawel Dziepak
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 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 General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License along
  18  * with this program; if not, write to the Free Software Foundation, Inc.,
  19  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  */
  22
  23 #ifndef _DELEGATE_H_
  24 #define _DELEGATE_H_
  25
  26 template<typename ret_type, typename arg_type1 = int, typename arg_type2 = int,
  27         typename arg_type3 = int, typename arg_type4 = int,
  28         typename arg_type5 = int, typename arg_type6 = int,
  29         typename arg_type7 = int>
  30 class delegate {
  31 private:
  32
  33         class A {};
  34
  35         /* Pointer to object (for methods only) */
  36         A *owner;
  37
  38         /* Union of different types of pointer to method/function */
  39         union {
  40                 /* Direct call method */
  41                 ret_type (A::*meth_a0)();
  42                 ret_type (A::*meth_a1)(arg_type1);
  43                 ret_type (A::*meth_a2)(arg_type1, arg_type2);
  44                 ret_type (A::*meth_a3)(arg_type1, arg_type2, arg_type3);
  45                 ret_type (A::*meth_a4)(arg_type1, arg_type2, arg_type3, arg_type4);
  46                 ret_type (A::*meth_a5)(arg_type1, arg_type2, arg_type3, arg_type4, arg_type5);
  47                 ret_type (A::*meth_a6)(arg_type1, arg_type2, arg_type3, arg_type4, arg_type5, arg_type6);
  48                 ret_type (A::*meth_a7)(arg_type1, arg_type2, arg_type3, arg_type4, arg_type5, arg_type6, arg_type7);
  49
  50                 /* Direct call function */
  51                 ret_type (*func_a0)();
  52                 ret_type (*func_a1)(arg_type1);
  53                 ret_type (*func_a2)(arg_type1, arg_type2);
  54                 ret_type (*func_a3)(arg_type1, arg_type2, arg_type3);
  55                 ret_type (*func_a4)(arg_type1, arg_type2, arg_type3, arg_type4);
  56                 ret_type (*func_a5)(arg_type1, arg_type2, arg_type3, arg_type4, arg_type5);
  57                 ret_type (*func_a6)(arg_type1, arg_type2, arg_type3, arg_type4, arg_type5, arg_type6);
  58                 ret_type (*func_a7)(arg_type1, arg_type2, arg_type3, arg_type4, arg_type5, arg_type6, arg_type7);
  59         } ptr;
  60
  61         /* Current state of the delegate */
  62         enum del_type { del_uninit, del_method, del_function } type;
  63
  64         typedef delegate<ret_type, arg_type1, arg_type2, arg_type3,arg_type4, arg_type5, arg_type6, arg_type7> this_delegate;
  65
  66 public:
  67         delegate();
  68         ~delegate();
  69
  70         delegate(const delegate<ret_type, arg_type1, arg_type2, arg_type3,arg_type4, arg_type5, arg_type6, arg_type7>&);
  71         delegate<ret_type, arg_type1, arg_type2, arg_type3,arg_type4, arg_type5, arg_type6, arg_type7> &operator=(const delegate<ret_type, arg_type1, arg_type2, arg_type3,arg_type4, arg_type5, arg_type6, arg_type7> &);
  72
  73
  74         /* Save method pointer for different number of arguments */
  75         template<class T> static delegate<ret_type, arg_type1, arg_type2, arg_type3,arg_type4, arg_type5, arg_type6, arg_type7> method(T *obj,ret_type (T::*_ptr)());
  76         template<class T> static delegate<ret_type, arg_type1, arg_type2, arg_type3, arg_type4, arg_type5, arg_type6, arg_type7> method(T *obj,ret_type (T::*_ptr)(arg_type1));
  77         template<class T> static delegate<ret_type, arg_type1, arg_type2, arg_type3, arg_type4, arg_type5, arg_type6, arg_type7> method(T *obj,ret_type (T::*_ptr)(arg_type1, arg_type2));
  78         template<class T> static delegate<ret_type, arg_type1, arg_type2, arg_type3, arg_type4, arg_type5, arg_type6, arg_type7> method(T *obj,ret_type (T::*_ptr)(arg_type1, arg_type2, arg_type3));
  79         template<class T> static delegate<ret_type, arg_type1, arg_type2, arg_type3, arg_type4, arg_type5, arg_type6, arg_type7> method(T *obj,ret_type (T::*_ptr)(arg_type1, arg_type2, arg_type3, arg_type4));
  80         template<class T> static delegate<ret_type, arg_type1, arg_type2, arg_type3, arg_type4, arg_type5, arg_type6, arg_type7> method(T *obj,ret_type (T::*_ptr)(arg_type1, arg_type2, arg_type3, arg_type4, arg_type5));
  81         template<class T> static delegate<ret_type, arg_type1, arg_type2, arg_type3, arg_type4, arg_type5, arg_type6, arg_type7> method(T *obj,ret_type (T::*_ptr)(arg_type1, arg_type2, arg_type3, arg_type4, arg_type5, arg_type6));
  82         template<class T> static delegate<ret_type, arg_type1, arg_type2, arg_type3, arg_type4, arg_type5, arg_type6, arg_type7> method(T *obj,ret_type (T::*_ptr)(arg_type1, arg_type2, arg_type3, arg_type4, arg_type5, arg_type6, arg_type7));
  83
  84         /* Save function pointer for different number of arguments */
  85         static delegate<ret_type, arg_type1, arg_type2, arg_type3, arg_type4, arg_type5, arg_type6, arg_type7> function(ret_type (*_ptr)());
  86         static delegate<ret_type, arg_type1, arg_type2, arg_type3, arg_type4, arg_type5, arg_type6, arg_type7> function(ret_type (*_ptr)(arg_type1));
  87         static delegate<ret_type, arg_type1, arg_type2, arg_type3, arg_type4, arg_type5, arg_type6, arg_type7> function(ret_type (*_ptr)(arg_type1, arg_type2));
  88         static delegate<ret_type, arg_type1, arg_type2, arg_type3, arg_type4, arg_type5, arg_type6, arg_type7> function(ret_type (*_ptr)(arg_type1, arg_type2, arg_type3));
  89         static delegate<ret_type, arg_type1, arg_type2, arg_type3, arg_type4, arg_type5, arg_type6, arg_type7> function(ret_type (*_ptr)(arg_type1, arg_type2, arg_type3, arg_type4));
  90         static delegate<ret_type, arg_type1, arg_type2, arg_type3, arg_type4, arg_type5, arg_type6, arg_type7> function(ret_type (*_ptr)(arg_type1, arg_type2, arg_type3, arg_type4, arg_type5));
  91         static delegate<ret_type, arg_type1, arg_type2, arg_type3, arg_type4, arg_type5, arg_type6, arg_type7> function(ret_type (*_ptr)(arg_type1, arg_type2, arg_type3, arg_type4, arg_type5, arg_type6));
  92         static delegate<ret_type, arg_type1, arg_type2, arg_type3, arg_type4, arg_type5, arg_type6, arg_type7> function(ret_type (*_ptr)(arg_type1, arg_type2, arg_type3, arg_type4, arg_type5, arg_type6, arg_type7));
  93
  94         /* Calling function/method with different number of arguments */
  95         ret_type call(arg_type1 arg1, arg_type2 arg2, arg_type3 arg3, arg_type4 arg4, arg_type5 arg5, arg_type6 arg6, arg_type7 arg7) const;
  96
  97         /* Overloaded operators () for different numbers of arguments */
  98         ret_type operator()() const;
  99         ret_type operator()(arg_type1 arg1) const;
 100         ret_type operator()(arg_type1 arg1, arg_type2 arg2) const;
 101         ret_type operator()(arg_type1 arg1, arg_type2 arg2, arg_type3 arg3) const;
 102         ret_type operator()(arg_type1 arg1, arg_type2 arg2, arg_type3 arg3, arg_type4 arg4) const;
 103         ret_type operator()(arg_type1 arg1, arg_type2 arg2, arg_type3 arg3, arg_type4 arg4, arg_type5 arg5) const;
 104         ret_type operator()(arg_type1 arg1, arg_type2 arg2, arg_type3 arg3, arg_type4 arg4, arg_type5 arg5, arg_type6 arg6) const;
 105         ret_type operator()(arg_type1 arg1, arg_type2 arg2, arg_type3 arg3, arg_type4 arg4, arg_type5 arg5, arg_type6 arg6, arg_type7 arg7) const;
 106
 107         bool operator==(const delegate<ret_type, arg_type1, arg_type2, arg_type3, arg_type4, arg_type5, arg_type6, arg_type7> &) const;
 108
 109         bool null() const;
 110 };
 111
 112 #include "delegate.cpp"
 113
 114 #endif
 115