---
name: "SoQtObject"
section: "3"
platform: "linux"
package: "libsoqt-dev-common"
version: "1.6.0~e8310f-3"
release: "Debian 9 (Stretch)"
platforms: ["linux"]
url: "https://new.carta.tech/SoQtObject"
---

# SoQtObject(3)

The SoQtObject class is the common superclass for all SoQt component classes. The purpose of making this class the superclass of all SoQt device, component and viewer classes is to be able to do run-time type checking of the SoQt objects.

## NAME

SoQtObject - The **SoQtObject** class is the common superclass for all **SoQt** component classes.

The purpose of making this class the superclass of all **SoQt** device, component and viewer classes is to be able to do run-time type checking of the **SoQt** objects.

## SYNOPSIS

`#include <Inventor/Qt/SoQtObject.h>`

Inherited by **SoQtComponent**, and **SoQtDevice**.

### Public Member Functions

virtual SoType **getTypeId** (void) const =0\
 SbBool **isOfType** (SoType type) const \

### Static Public Member Functions

static void **initClass** (void)\
 static SoType **getClassTypeId** (void)\
 static void **init** (void)\

## Detailed Description

The **SoQtObject** class is the common superclass for all **SoQt** component classes.

The purpose of making this class the superclass of all **SoQt** device, component and viewer classes is to be able to do run-time type checking of the **SoQt** objects.

You can place the macro SOQT\_OBJECT\_HEADER(classname,parentname) within a class definition header for **SoQt** extension components to automatically make the necessary definitions for setting up a run-time type system for your extension classes:

```
#ifndef MYSPECIALVIEWER_H
#define MYSPECIALVIEWER_H
class MySpecialViewer : public SoQtExaminerViewer {
  SOQT_OBJECT_HEADER(MySpecialViewer, SoQtExaminerViewer);
  // [rest of class definition follows]
};
#endif // !MYSPECIALVIEWER_H
```

Then put the SOQT\_OBJECT\_SOURCE(classname) macro within the actual implementation sourcecode file to include the necessary code for the run-time type system:

```
#include <MySpecialViewer.h>
SOQT_OBJECT_SOURCE(MySpecialViewer);
// [rest of class implementation]
```

See also the documentation of the SoType class in Coin or Inventor.

## Member Function Documentation

### void SoQtObject::initClass (void)` [static]`

Sets up initialization for data common to all instances of this class, submitting necessary information to the internal **SoQt** type system.

Referenced by init(), SoQtDevice::initClasses(), and SoQtComponent::initClasses().

### SoType SoQtObject::getClassTypeId (void)` [static]`

This static method returns the SoType object associated with objects of this class.

Referenced by SoQtRenderArea::sizeChanged().

### SoType SoQtObject::getTypeId (void) const` [pure virtual]`

Returns the type identification of an object derived from a class inheriting **SoQtObject**. This is used for run-time type checking and 'downward' casting.

Usage example:

```
void foo(SoQtViewer * comp)
{
  if (comp->getTypeId() == SoQtExaminerViewer::getClassTypeId()) {
    // safe downward cast, knows the type
    SoQtExaminerViewer * exviewer = (SoQtExaminerViewer *)comp;
  }
  else if (comp->getTypeId().isOfType(SoQtFlyViewer::getClassTypeId())) {
    // safe downward cast, knows the type
    SoQtFlyViewer * flyviewer = (SoQtFlyViewer *)comp;
    // then something else
  }
}
```

Referenced by isOfType(), and SoQtRenderArea::sizeChanged().

### SbBool SoQtObject::isOfType (SoType type) const

Returns `TRUE` if the type of this object is either of the same type or inherited from *type*.

References getTypeId().

### void SoQtObject::init (void)` [static]`

Initialize the type system of **SoQtObject**, all **SoQt** device classes and all **SoQt** components (including viewers).

References initClass(), SoQtDevice::initClasses(), and SoQtComponent::initClasses().

## Author

Generated automatically by Doxygen for SoQt from the source code.