const_mem_functor2 wraps const methods with 2 argument(s).  
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#include <sigc++/functors/mem_fun.h>
template<class T_return, class T_obj, class T_arg1, class T_arg2>
class sigc::const_mem_functor2< T_return, T_obj, T_arg1, T_arg2 >
const_mem_functor2 wraps const methods with 2 argument(s). 
Use the convenience function mem_fun() to create an instance of const_mem_functor2.
The following template arguments are used:
- T_arg1 Argument type used in the definition of operator()().
- T_arg2 Argument type used in the definition of operator()().
- T_return The return type of operator()().
- T_obj The object type. 
template <class T_return , class T_obj , class T_arg1 , class T_arg2 > 
      
        
          | typedef T_return(T_obj::* sigc::const_mem_functor2< T_return, T_obj, T_arg1, T_arg2 >::function_type) (T_arg1, T_arg2) const | 
      
 
 
template <class T_return , class T_obj , class T_arg1 , class T_arg2 > 
      
 
 
template <class T_return , class T_obj , class T_arg1 , class T_arg2 > 
 
Constructs an invalid functor. 
 
 
template <class T_return , class T_obj , class T_arg1 , class T_arg2 > 
 
 
template <class T_return , class T_obj , class T_arg1 , class T_arg2 > 
 
Execute the wrapped method operating on the passed instance. 
- Parameters
- 
  
    | _A_obj | Pointer to instance the method should operate on. |  | _A_a1 | Argument to be passed on to the method. |  | _A_a2 | Argument to be passed on to the method. |  
 
- Returns
- The return value of the method invocation. 
 
 
template <class T_return , class T_obj , class T_arg1 , class T_arg2 > 
 
Execute the wrapped method operating on the passed instance. 
- Parameters
- 
  
    | _A_obj | Reference to instance the method should operate on. |  | _A_a1 | Argument to be passed on to the method. |  | _A_a2 | Argument to be passed on to the method. |  
 
- Returns
- The return value of the method invocation. 
 
 
template <class T_return , class T_obj , class T_arg1 , class T_arg2 >