sigc::compose() combines two or three arbitrary functors.
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sigc::compose() combines two or three arbitrary functors.
On invocation, 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; }
square_root(9))
compose1_functor< T_setter, T_getter > compose(const T_setter &setter, const T_getter &getter)
Creates an adaptor of type sigc::compose1_functor which combines two functors.
Definition: compose.h:171
The functor that sigc::compose() returns can be passed directly into sigc::signal::connect() or sigc::signal::connect_first().
- Example:
sigc::signal(float(float, float)> some_signal;
◆ compose() [1/2]
template <typename T_setter , typename T_getter >
| compose1_functor<T_setter, T_getter> sigc::compose |
( |
const T_setter & |
setter, |
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|
const T_getter & |
getter |
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) |
| |
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inline |
Creates an adaptor of type sigc::compose1_functor which combines two functors.
- Parameters
-
| setter | Functor that receives the return value of the invocation of getter. |
| getter | Functor to invoke from operator()(). |
- Returns
- Adaptor that executes setter with the value returned from invocation of getter.
◆ compose() [2/2]
template <typename T_setter , typename T_getter1 , typename T_getter2 >
| compose2_functor<T_setter, T_getter1, T_getter2> sigc::compose |
( |
const T_setter & |
setter, |
|
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const T_getter1 & |
getter1, |
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const T_getter2 & |
getter2 |
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) |
| |
|
inline |
Creates an adaptor of type sigc::compose2_functor which combines three functors.
- Parameters
-
| setter | Functor that receives the return values of the invocation of getter1 and getter2. |
| getter1 | Functor to invoke from operator()(). |
| getter2 | Functor to invoke from operator()(). |
- Returns
- Adaptor that executes setter with the values return from invocation of getter1 and getter2.
