#include <sigc++/functors/ptr_fun.h>
template <typename T_return , typename... T_args> 
 
Constructs an invalid functor. 
 
 
template <typename T_return , typename... T_args> 
 
Constructs a pointer_functor2 object that wraps an existing function. 
- Parameters
- 
  
    | func | Pointer to function that will be invoked from operator()(). |  
 
 
 
template <typename T_return , typename... T_args> 
 
Execute the wrapped function. 
- Parameters
- 
  
    | a | Arguments to be passed on to the function. |  
 
- Returns
- The return value of the function invocation. 
 
 
template <typename T_return , typename... T_args>