sigc::compose() combines two or three arbitrary functors.  
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sigc::compose() combines two or three arbitrary functors. 
On invokation, parameters are passed on to one or two getter functor(s). The return value(s) are then passed on to the setter function.
- Examples:
- float square_root(float a)  { return sqrtf(a); } - float sum- ( float-  a,  float-  b) {  return-  a+b; } 
 - compose1_functor< T_setter, T_getter > compose(const T_setter &_A_setter, const T_getter &_A_getter) - Creates an adaptor of type sigc::compose1_functor which combines two functors. - Definition: compose.h:288 
The functor sigc::compose() returns can be passed directly into sigc::signal::connect().
- Example:
- 
- iterator connect(const slot_type &slot_) - Add a slot to the list of slots. - Definition: signal.h:3871 
- Convenience wrapper for the numbered sigc::signal# templates. - Definition: signal.h:4015 
 
◆ compose() [1/2]
template <class T_setter , class T_getter > 
  
  | 
        
          | compose1_functor<T_setter, T_getter> sigc::compose | ( | const T_setter & | _A_setter, |  
          |  |  | const T_getter & | _A_getter |  
          |  | ) |  |  |  | inline | 
 
Creates an adaptor of type sigc::compose1_functor which combines two functors. 
- Parameters
- 
  
    | _A_setter | Functor that receives the return value of the invokation of _A_getter. |  | _A_getter | Functor to invoke from operator()(). |  
 
- Returns
- Adaptor that executes _A_setter with the value returned from invokation of _A_getter. 
 
 
◆ compose() [2/2]
template <class T_setter , class T_getter1 , class T_getter2 > 
  
  | 
        
          | compose2_functor<T_setter, T_getter1, T_getter2> sigc::compose | ( | const T_setter & | _A_setter, |  
          |  |  | const T_getter1 & | _A_getter1, |  
          |  |  | const T_getter2 & | _A_getter2 |  
          |  | ) |  |  |  | inline | 
 
Creates an adaptor of type sigc::compose2_functor which combines three functors. 
- Parameters
- 
  
    | _A_setter | Functor that receives the return values of the invokation of _A_getter1 and _A_getter2. |  | _A_getter1 | Functor to invoke from operator()(). |  | _A_getter2 | Functor to invoke from operator()(). |  
 
- Returns
- Adaptor that executes _A_setter with the values return from invokation of _A_getter1 and _A_getter2.