# PIP: PIObject Class Reference

PIObject Class Reference

This is base class for any classes which use events -> handlers mechanism. More...

Inheritance diagram for PIObject:
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## Public Member Functions

| PIObject (const PIString &name=PIString())
| Contructs PIObject with name "name".
PIString | name () const
| Returns object name.
virtual const char * | className () const
| Returns object class name.
virtual const char * | superClassName () const
| Returns object superclass name.
bool | debug () const
| Return if debug of this object is active.
void | setName (const PIString &name)
| Set object name.
void | setDebug (bool debug)
| Set object debug active.
const PIMap< PIString, PIVariant > & | properties () const
| Returns properties of the object.
int | propertiesCount () const
| Returns properties count of the object.
PIVariant | property (const PIString &name) const
| Returns property with name "name".
void | setProperty (const PIString &name, const PIVariant &value)
| Set property with name "name" to "value". If there is no such property in object it will be added.
bool | isPropertyExists (const PIString &name) const
| Returns if property with name "name" exists.

## Static Public Member Functions

static void | piDisconnect (PIObject *src, const PIString &sig)
| Disconnect object "src" from all connections with event name "sig".
static void | piDisconnect (PIObject *src)
| Disconnect object "src" from all connections, i.e. all connections where object "src" is emitter.
static PIObject * | findByName (const PIString &name)
| Returns PIObject* with name "name" or 0, if there is no object found.

## Protected Member Functions

PIObject * | emitter () const
| Returns PIObject* which has raised an event. This value is correct only in definition of some event handler.
virtual void | propertyChanged (const PIString &name)
| Virtual function executes after property with name "name" has been changed.

## Related Functions

(Note that these are not member functions.)
#define | piCoutObj
| Macro used for conditional (piDebug and PIObject::debug()) output to PICout for subclasses of PIObject.
#define | PIOBJECT(name)
| you should use this macro after class declaration to use EVENT and EVENT_HANDLER and correct piCoutObj output
#define | PIOBJECT_SUBCLASS(name, parent)
| you should use this macro after class declaration to use EVENT and EVENT_HANDLER of parent class
#define | EVENT_HANDLER0(ret, name) ret name()
| declare event handler "event" with name "name" and return type "ret", ret name()
#define | EVENT_HANDLER1(ret, name, type0, var0) ret name(type0 var0)
| declare event handler "event" with name "name" and return type "ret", ret name(type0 var0)
#define | EVENT_HANDLER2(ret, name, type0, var0, type1, var1) ret name(type0 var0, type1 var1)
| declare event handler "event" with name "name" and return type "ret", ret name(type0 var0, type1 var1)
#define | EVENT_HANDLER3(ret, name, type0, var0, type1, var1, type2, var2) ret name(type0 var0, type1 var1, type2 var2)
| declare event handler "event" with name "name" and return type "ret", ret name(type0 var0, type1 var1, type2 var2)
#define | EVENT_HANDLER4(ret, name, type0, var0, type1, var1, type2, var2, type3, var3) ret name(type0 var0, type1 var1, type2 var2, type3 var3)
| declare event handler "event" with name "name" and return type "ret", ret name(type0 var0, type1 var1, type2 var2, type3 var3)
#define | EVENT_HANDLER EVENT_HANDLER0
| EVENT_HANDLER is synonym of EVENT_HANDLER0.
#define | EVENT_VHANDLER0(ret, name) virtual ret name()
| declare virtual event handler "event" with name "name" and return type "ret", virtual ret name()
#define | EVENT_VHANDLER1(ret, name, type0, var0) virtual ret name(type0 var0)
| declare virtual event handler "event" with name "name" and return type "ret", virtual ret name(type0 var0)
#define | EVENT_VHANDLER2(ret, name, type0, var0, type1, var1) virtual ret name(type0 var0, type1 var1)
| declare virtual event handler "event" with name "name" and return type "ret", virtual ret name(type0 var0, type1 var1)
#define | EVENT_VHANDLER3(ret, name, type0, var0, type1, var1, type2, var2) virtual ret name(type0 var0, type1 var1, type2 var2)
| declare virtual event handler "event" with name "name" and return type "ret", virtual ret name(type0 var0, type1 var1, type2 var2)
#define | EVENT_VHANDLER4(ret, name, type0, var0, type1, var1, type2, var2, type3, var3) virtual ret name(type0 var0, type1 var1, type2 var2, type3 var3)
| declare virtual event handler "event" with name "name" and return type "ret", virtual ret name(type0 var0, type1 var1, type2 var2, type3 var3)
#define | EVENT_VHANDLER EVENT_VHANDLER0
| EVENT_VHANDLER is synonym of EVENT_VHANDLER0.
#define | EVENT0(name) void name();
| declare event "event" with name "name", void name();
#define | EVENT1(name, type0, var0) void name(type0 var0);
| declare event "event" with name "name", void name(type0 var0);
#define | EVENT2(name, type0, var0, type1, var1) void name(type0 var0, type1 var1);
| declare event "event" with name "name", void name(type0 var0, type1 var1);
#define | EVENT3(name, type0, var0, type1, var1, type2, var2) void name(type0 var0, type1 var1, type2 var2);
| declare event "event" with name "name", void name(type0 var0, type1 var1, type2 var2);
#define | EVENT4(name, type0, var0, type1, var1, type2, var2, type3, var3) void name(type0 var0, type1 var1, type2 var2, type3 var3);
| declare event "event" with name "name", void name(type0 var0, type1 var1, type2 var2, type3 var3);
#define | EVENT EVENT0
| EVENT is synonym of EVENT0.
#define | CONNECTU(src, event, dest, handler)
| connect event "event" from object "src" to event handler "handler". "Event" and "handler" must has equal argument lists.
#define | CONNECT0(ret, src, event, dest, handler)
| connect event "event" from object "src" to event handler "handler" with return type "ret" from object "dest" with check of event and handler exists
#define | CONNECT1(ret, type0, src, event, dest, handler)
| connect event "event" from object "src" to event handler "handler" with return type "ret" from object "dest" with check of event and handler exists
#define | CONNECT2(ret, type0, type1, src, event, dest, handler)
| connect event "event" from object "src" to event handler "handler" with return type "ret" from object "dest" with check of event and handler exists
#define | CONNECT3(ret, type0, type1, type2, src, event, dest, handler)
| connect event "event" from object "src" to event handler "handler" with return type "ret" from object "dest" with check of event and handler exists
#define | CONNECT4(ret, type0, type1, type2, type3, src, event, dest, handler)
| connect event "event" from object "src" to event handler "handler" with return type "ret" from object "dest" with check of event and handler exists
#define | CONNECT CONNECT0
| CONNECT is synonym of CONNECT0.
#define | WEAK_CONNECT0(ret, src, event, dest, handler)
| connect event "event" from object "src" to event handler "handler" with return type "ret" from object "dest" without check of event exists
#define | WEAK_CONNECT1(ret, type0, src, event, dest, handler)
| connect event "event" from object "src" to event handler "handler" with return type "ret" from object "dest" without check of event exists
#define | WEAK_CONNECT2(ret, type0, type1, src, event, dest, handler)
| connect event "event" from object "src" to event handler "handler" with return type "ret" from object "dest" without check of event exists
#define | WEAK_CONNECT3(ret, type0, type1, type2, src, event, dest, handler)
| connect event "event" from object "src" to event handler "handler" with return type "ret" from object "dest" without check of event exists
#define | WEAK_CONNECT4(ret, type0, type1, type2, type3, src, event, dest, handler)
| connect event "event" from object "src" to event handler "handler" with return type "ret" from object "dest" without check of event exists
#define | WEAK_CONNECT WEAK_CONNECT0
| WEAK_CONNECT is synonym of WEAK_CONNECT0.
#define | DISCONNECT0(ret, src, event, dest, handler)
| piDisconnect event "event" from object "src" from event handler "handler" with return type "ret" from object "dest"
#define | DISCONNECT1(ret, type0, src, event, dest, handler)
| piDisconnect event "event" from object "src" from event handler "handler" with return type "ret" from object "dest"
#define | DISCONNECT2(ret, type0, type1, src, event, dest, handler)
| piDisconnect event "event" from object "src" from event handler "handler" with return type "ret" from object "dest"
#define | DISCONNECT3(ret, type0, type1, type2, src, event, dest, handler)
| piDisconnect event "event" from object "src" from event handler "handler" with return type "ret" from object "dest"
#define | DISCONNECT4(ret, type0, type1, type2, type3, src, event, dest, handler)
| piDisconnect event "event" from object "src" from event handler "handler" with return type "ret" from object "dest"
#define | DISCONNECT DISCONNECT0
| DISCONNECT is synonym of DISCONNECT0.
#define | HANDLER(handler)
| Returns pointer to events handler "handler".

## Events

void | deleted ()
| Raise before object delete. More...

## Detailed Description

This is base class for any classes which use events -> handlers mechanism.

# Events and Event handlers

PIObject provide notification mechanism similar Qt but implemented on language capabilities without any special preprocessors or compilers. Any class inherits PIObject should use macro PIOBJECT() immediate after declaration to proper compile.

Event is a some abstract event that can be raised at any time. Event is a function but declared with special macro EVENT(). To raise event simply execute event function.

Event handler is a function but declared with special macro EVENT_HANDLER(). You can use event handlers as ordinary functions.

Main goal of this mechanism is perform abstract connections between various objects. This functionality provide macro CONNECT() which connect some event of first object to some event handler or event of second object. Each event can be connected any times to any event handlers.

Example:

class ObjectA: public PIObject {
PIOBJECT(ObjectA)
public:
EVENT_HANDLER1(void, handlerA, const PIString & , str) {piCoutObj << "handler A:" << str;}
EVENT2(eventA2, int, i, float, f);
EVENT1(eventA1, const PIString & , str);
};
class ObjectB: public PIObject {
PIOBJECT(ObjectB)
public:
EVENT_HANDLER2(void, handlerB, int, i, float, f) {piCoutObj << "handler B:" << i << "," << f;}
EVENT1(eventB, PIString, str);
};
int main(int argc, char * argv[]) {
ObjectA obj_a;
ObjectB obj_b;
CONNECT2(void, int, float, &obj_a, eventA2, &obj_b, handlerB);
obj_a.eventA2(2, 0.5);
CONNECT1(void, PIString, &obj_b, eventB, &obj_a, handlerA);
obj_b.eventB("event to handler");
CONNECT1(void, PIString, &obj_a, eventA1, &obj_b, eventB);
obj_a.eventA1("event to event");
};

Result:

handler B: 2 , 0.5
handler A: event to handler
handler A: event to event

## Member Function Documentation

void PIObject::deleted | ( |  | ) |

protected

Raise before object delete.

Note
  This event raised from destructor, so use only emitter() value, don`t try to cast deleted object to some subclass!