# Adaptors

Adaptors are functors that alter the signature of a functor's operator()(). More...

Collaboration diagram for Adaptors:

## Classes
struct | sigc::adaptor_base
| A hint to the compiler. More...
struct | sigc::deduce_result_type< T_functor, T_arg1, T_arg2, T_arg3, T_arg4, T_arg5, T_arg6, T_arg7, I_derives_adaptor_base >
| Deduce the return type of a functor. More...
struct | sigc::adaptor_functor< T_functor >
| Converts an arbitrary functor into an adaptor type. More...
struct | sigc::adapts< T_functor >
| Base type for adaptors. More...
## Modules
| bind(), bind_return()

| sigc::bind() alters an arbitrary functor by fixing arguments to certain values.
| hide(), hide_return()

| sigc::hide() alters an arbitrary functor in that it adds a parameter whose value is ignored on invocation of the returned functor.
| retype(), retype_return()

| sigc::retype() alters a sigc::pointer_functor, a sigc::mem_functor or a sigc::slot in that it makes C-style casts to the functor's parameter types of all parameters passed through operator()().
| compose()

| sigc::compose() combines two or three arbitrary functors.
| exception_catch()

| sigc::exception_catch() catches an exception thrown from within the wrapped functor and directs it to a catcher functor.
| group()

| sigc::group() alters an arbitrary functor by rebuilding its arguments from one or more lambda expressions.
## Functions
template<class T_action , class T_functor >
void | sigc::visit_each (const T_action& _A_action, const adaptor_functor< T_functor >& _A_target)
| Performs a functor on each of the targets of a functor.

## Detailed Description

Adaptors are functors that alter the signature of a functor's operator()().

The adaptor types libsigc++ provides are created with bind(), bind_return(), hide(), hide_return(), retype_return(), retype(), compose(), exception_catch() and group().

You can easily derive your own adaptor type from sigc::adapts.

## Function Documentation

template <class T_action , class T_functor >

void sigc::visit_each | ( | const T_action & | _A_action,
|  | const adaptor_functor< T_functor > & | _A_target |
| ) |  |  | `[inline]`

Performs a functor on each of the targets of a functor.

The function overload for sigc::adaptor_functor performs a functor on the functor stored in the sigc::adaptor_functor object.