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# sigc::slot_base Class Reference
[Slots]

Base type for slots. More...

Inheritance diagram for sigc::slot_base:

[legend]
List of all members.

## Public Types
typedef trackable::func_destroy_notify | func_destroy_notify
## Public Member Functions
| slot_base ()
| Constructs an empty slot.
| slot_base (rep_type* rep)
| Constructs a slot from an existing slot_rep object.
| slot_base (const slot_base& src)
| Constructs a slot, copying an existing one.
| ~slot_base ()
| operator bool () const
| Tests whether a slot is null, because the default constructor was used.
void | set_parent (void* parent, void*(* cleanup)(void*)) const
| Sets the parent of this slot.
void | add_destroy_notify_callback (void* data, func_destroy_notify func) const
| Add a callback that is executed (notified) when the slot is detroyed.
void | remove_destroy_notify_callback (void* data) const
| Remove a callback previously installed with add_destroy_notify_callback().
bool | empty () const
| Returns whether the slot is invalid.
bool | blocked () const
| Returns whether the slot is blocked.
bool | block (bool should_block=true)
| Sets the blocking state.
bool | unblock ()
| Unsets the blocking state.
void | disconnect ()
| Disconnects the slot.
## Public Attributes
rep_type* | rep_
| Typed slot_rep object that contains a functor.
bool | blocked_
| Indicates whether the slot is blocked.
## Protected Member Functions
slot_base& | operator= (const slot_base& src)
| Overrides this slot making a copy from another slot.

## Detailed Description

Base type for slots.

slot_base integrates most of the interface of the derived sigc::slot templates. slots can be connected to signals, be disconnected at some later point (disconnect()) and temporarily be blocked (block(), unblock()). The validity of a slot can be tested with empty().

The internal representation of a sigc::internal::slot_rep derived type is built from slot_base's derivations. set_parent() is used to register a notification callback that is executed when the slot gets invalid. add_destroy_notify_callback() is used by connection objects to add a notification callback that is executed on destruction.

## Member Typedef Documentation

typedef trackable::func_destroy_notify sigc::slot_base::func_destroy_notify

## Constructor & Destructor Documentation

sigc::slot_base::slot_base | ( |  | ) |

| Constructs an empty slot.

sigc::slot_base::slot_base | ( | rep_type* | rep | ) | `[explicit]`

  | Constructs a slot from an existing slot_rep object. Parameters:
  | rep | The slot_rep object this slot should contain.

sigc::slot_base::slot_base | ( | const slot_base& | src | ) |

  | Constructs a slot, copying an existing one. Parameters:
  | src | The existing slot to copy.

sigc::slot_base::~slot_base | ( |  | ) |

## Member Function Documentation

void sigc::slot_base::add_destroy_notify_callback | ( | void* | data,
|  | func_destroy_notify | func
| ) | const

  | Add a callback that is executed (notified) when the slot is detroyed. This function is used internally by connection objects. Parameters:
  | data | Passed into func upon notification.
  | func | Callback executed upon destruction of the object.

bool sigc::slot_base::block | ( | bool | should_block = `true` | ) |

  | Sets the blocking state. If should_block is `true` then the blocking state is set. Subsequent calls to slot::operator()() don't invoke the functor contained by this slot until unblock() or block() with should_block = `false` is called. Parameters:
  | should_block | Indicates whether the blocking state should be set or unset.
Returns: `true` if the slot was in blocking state before.

bool sigc::slot_base::blocked | ( |  | ) | const`[inline]`

| Returns whether the slot is blocked. Returns: `true` if the slot is blocked.

void sigc::slot_base::disconnect | ( |  | ) |

| Disconnects the slot. Invalidates the slot and notifies the parent.

bool sigc::slot_base::empty | ( |  | ) | const`[inline]`

| Returns whether the slot is invalid. Returns: `true` if the slot is invalid (empty).

sigc::slot_base::operator bool | ( |  | ) | const

| Tests whether a slot is null, because the default constructor was used. Test a slot for null like so:
     if(slot)
      do_something()

slot_base& sigc::slot_base::operator= | ( | const slot_base& | src | ) | `[protected]`

  | Overrides this slot making a copy from another slot. Parameters:
  | src | The slot from which to make a copy.
Returns: `this`.

void sigc::slot_base::remove_destroy_notify_callback | ( | void* | data | ) | const

  | Remove a callback previously installed with add_destroy_notify_callback(). The callback is not executed. Parameters:
  | data | Parameter passed into previous call to add_destroy_notify_callback().

void sigc::slot_base::set_parent | ( | void* | parent,
|  | void *(* | cleanup)(void *)
| ) | const

  | Sets the parent of this slot. This function is used by signals to register a notification callback. This notification callback is executed when the slot becomes invalid because of some referred object dying. Parameters:
  | parent | The new parent.
  | cleanup | The notification callback.

bool sigc::slot_base::unblock | ( |  | ) |

| Unsets the blocking state. Returns: `true` if the slot was in blocking state before.

## Member Data Documentation

bool sigc::slot_base::blocked_

| Indicates whether the slot is blocked.

rep_type* sigc::slot_base::rep_`[mutable]`

| Typed slot_rep object that contains a functor.

The documentation for this class was generated from the following file:

- slot_base.h