Base type for slots.  
 More...
#include <sigc++/functors/slot_base.h>
|  | 
| bool | blocked_ | 
|  | Indicates whether the slot is blocked.  More... 
 | 
|  | 
| rep_type* | rep_ | 
|  | Typed slot_rep object that contains a functor.  More... 
 | 
|  | 
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. 
§ func_destroy_notify
§ slot_base() [1/4]
  
  | 
        
          | sigc::slot_base::slot_base | ( |  | ) |  |  | noexcept | 
 
Constructs an empty slot. 
 
 
§ slot_base() [2/4]
  
  | 
        
          | sigc::slot_base::slot_base | ( | rep_type * | rep | ) |  |  | explicitnoexcept | 
 
Constructs a slot from an existing slot_rep object. 
- Parameters
- 
  
    | rep | The slot_rep object this slot should contain. |  
 
 
 
§ slot_base() [3/4]
      
        
          | sigc::slot_base::slot_base | ( | const slot_base& | src | ) |  | 
      
 
Constructs a slot, copying an existing one. 
- Parameters
- 
  
    | src | The existing slot to copy. |  
 
 
 
§ slot_base() [4/4]
      
        
          | sigc::slot_base::slot_base | ( | slot_base&& | src | ) |  | 
      
 
Constructs a slot, moving an existing one. 
If src is connected to a parent (e.g. a signal), it is copied, not moved. 
- Parameters
- 
  
    | src | The existing slot to move or copy. |  
 
 
 
§ ~slot_base()
      
        
          | sigc::slot_base::~slot_base | ( |  | ) |  | 
      
 
 
§ add_destroy_notify_callback()
      
        
          | 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. |  
 
 
 
§ block()
  
  | 
        
          | bool sigc::slot_base::block | ( | bool | should_block = true | ) |  |  | noexcept | 
 
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
- trueif the slot was in blocking state before.
 
 
§ blocked()
  
  | 
        
          | bool sigc::slot_base::blocked | ( |  | ) | const |  | inlinenoexcept | 
 
Returns whether the slot is blocked. 
- Returns
- trueif the slot is blocked.
 
 
§ disconnect()
      
        
          | void sigc::slot_base::disconnect | ( |  | ) |  | 
      
 
Disconnects the slot. 
Invalidates the slot and notifies the parent. 
 
 
§ empty()
  
  | 
        
          | bool sigc::slot_base::empty | ( |  | ) | const |  | inlinenoexcept | 
 
Returns whether the slot is invalid. 
- Returns
- trueif the slot is invalid (empty).
 
 
§ operator bool()
  
  | 
        
          | sigc::slot_base::operator bool | ( |  | ) | const |  | explicitnoexcept | 
 
Tests whether a slot is null, because the default constructor was used. 
Test a slot for null like so: 
 
 
 
§ operator=() [1/2]
Overrides this slot, making a copy from another slot. 
- Parameters
- 
  
    | src | The slot from which to make a copy. |  
 
- Returns
- this.
 
 
§ operator=() [2/2]
Overrides this slot, making a move from another slot. 
If src is connected to a parent (e.g. a signal), it is copied, not moved. 
- Parameters
- 
  
    | src | The slot from which to move or copy. |  
 
- Returns
- this.
 
 
§ remove_destroy_notify_callback()
      
        
          | void sigc::slot_base::remove_destroy_notify_callback | ( | void * | data | ) | const | 
      
 
 
§ set_parent()
  
  | 
        
          | void sigc::slot_base::set_parent | ( | void * | parent, |  
          |  |  | void *(*)(void *) | cleanup |  
          |  | ) |  | const |  | noexcept | 
 
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. |  
 
 
 
§ unblock()
  
  | 
        
          | bool sigc::slot_base::unblock | ( |  | ) |  |  | noexcept | 
 
Unsets the blocking state. 
- Returns
- trueif the slot was in blocking state before.
 
 
§ blocked_
      
        
          | bool sigc::slot_base::blocked_ | 
      
 
Indicates whether the slot is blocked. 
 
 
§ rep_
  
  | 
        
          | rep_type* sigc::slot_base::rep_ |  | mutable | 
 
Typed slot_rep object that contains a functor.