# Slots
[Function Objects]

Slots are type-safe representations of callback methods and functions. More...

Collaboration diagram for Slots:

## Classes
class | sigc::slot_base
| Base type for slots. More...
class | sigc::slot0< T_return >
| Converts an arbitrary functor to a unified type which is opaque. More...
class | sigc::slot1< T_return, T_arg1 >
| Converts an arbitrary functor to a unified type which is opaque. More...
class | sigc::slot2< T_return, T_arg1, T_arg2 >
| Converts an arbitrary functor to a unified type which is opaque. More...
class | sigc::slot3< T_return, T_arg1, T_arg2, T_arg3 >
| Converts an arbitrary functor to a unified type which is opaque. More...
class | sigc::slot4< T_return, T_arg1, T_arg2, T_arg3, T_arg4 >
| Converts an arbitrary functor to a unified type which is opaque. More...
class | sigc::slot5< T_return, T_arg1, T_arg2, T_arg3, T_arg4, T_arg5 >
| Converts an arbitrary functor to a unified type which is opaque. More...
class | sigc::slot6< T_return, T_arg1, T_arg2, T_arg3, T_arg4, T_arg5, T_arg6 >
| Converts an arbitrary functor to a unified type which is opaque. More...
class | sigc::slot7< T_return, T_arg1, T_arg2, T_arg3, T_arg4, T_arg5, T_arg6, T_arg7 >
| Converts an arbitrary functor to a unified type which is opaque. More...
class | sigc::slot< T_return, T_arg1, T_arg2, T_arg3, T_arg4, T_arg5, T_arg6, T_arg7 >
| Convenience wrapper for the numbered sigc::slot# templates. More...

## Detailed Description

Slots are type-safe representations of callback methods and functions.

A Slot can be constructed from any function, regardless of whether it is a global function, a member method, static, or virtual.

Use the sigc::mem_fun() and sigc::ptr_fun() template functions to get a sigc::slot, like so:

     sigc::slot<void, int> sl = sigc::mem_fun(someobj,& SomeClass::somemethod);

or

     sigc::slot<void, int> sl = sigc::ptr_fun(&somefunction);

or

     m_Button.signal_clicked().connect( sigc::mem_fun(*this, &MyWindow::on_button_clicked) );

The compiler will complain if SomeClass::somemethod, etc. have the wrong signature.

You can also pass slots as method parameters where you might normally pass a function pointer.