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Size of Derived class, upon virtual base class inheritance
Post 302866733 by Corona688 on Tuesday 22nd of October 2013 03:45:19 PM
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Why, here the size of class 'Derived' is 8 ?
class Base1
{
public:
virtual void f() { }
};
class Base2
{
public:
virtual void f() { }
};
class Derived : public Base1, Base2
{
public:
virtual void f() { }
}; (1 Reply)
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LEARN ABOUT DEBIAN
sosftrigger
SoSFTrigger(3) Coin SoSFTrigger(3) NAME
SoSFTrigger - The SoSFTrigger class is the 'void' class used for detecting field changes. Connect this field to a master field (or engine output) to detect when the master field changes its value. SYNOPSIS
#include <Inventor/fields/SoSFTrigger.h> Inherits SoSField. Public Member Functions virtual SoType getTypeId (void) const virtual void copyFrom (const SoField &field) const SoSFTrigger & operator= (const SoSFTrigger &field) virtual SbBool isSame (const SoField &field) const void setValue (void) void getValue (void) const int operator== (const SoSFTrigger &trigger) const int operator!= (const SoSFTrigger &trigger) const virtual void startNotify (void) virtual void notify (SoNotList *l) virtual void touch (void) Static Public Member Functions static void * createInstance (void) static SoType getClassTypeId (void) static void initClass (void) Additional Inherited Members Detailed Description The SoSFTrigger class is the 'void' class used for detecting field changes. Connect this field to a master field (or engine output) to detect when the master field changes its value. This is useful if you want to automatically trigger an update from the node or engine (or other field container) this field is part of whenever another field changes -- and you are not particularly interested in the actual value of the master field. See also: SoFieldSensor Member Function Documentation SoType SoSFTrigger::getClassTypeId (void) [static] Returns a unique type identifier for this field class. See also: getTypeId(), SoType Reimplemented from SoSField. SoType SoSFTrigger::getTypeId (void) const [virtual] Returns the type identification instance which uniquely identifies the Coin field class the object belongs to. See also: getClassTypeId(), SoType Implements SoField. void SoSFTrigger::copyFrom (const SoField &f) [virtual] Copy value(s) from f into this field. f must be of the same type as this field. Implements SoField. SbBool SoSFTrigger::isSame (const SoField &f) const [virtual] Check for equal type and value(s). Implements SoField. void SoSFTrigger::initClass (void) [static] Internal method called upon initialization of the library (from SoDB::init()) to set up the type system. Reimplemented from SoSField. void SoSFTrigger::setValue (void) This field class does not actually contain any value, so we just triggers an update by calling touch() within this method. void SoSFTrigger::getValue (void) const Field doesn't contain any value, so this method does nothing. int SoSFTrigger::operator== (const SoSFTrigger &trigger) const Since SoSFTrigger fields doesn't have any value, they are all equal. So this method always returns TRUE. int SoSFTrigger::operator!= (const SoSFTrigger &trigger) const Since SoSFTrigger fields doesn't have any value, they are all equal. So this method always returns FALSE. void SoSFTrigger::startNotify (void) [virtual] Trigger a notification sequence. At the end of a notification sequence, all 'immediate' sensors (i.e. sensors set up with a zero priority) are triggered. Reimplemented from SoField. void SoSFTrigger::notify (SoNotList *nlist) [virtual] Notify auditors that this field has changed. Reimplemented from SoField. void SoSFTrigger::touch (void) [virtual] Notify the field as well as the field's owner / container that it has been changed. Touching a field which is part of any component (engine or node) in a scene graph will lead to a forced redraw. This is useful if you have been doing several updates to the field wrapped in a pair of enableNotify() calls to notify the field's auditors that its value has changed. See also: setValue(), enableNotify() Reimplemented from SoField. Author Generated automatically by Doxygen for Coin from the source code. Version 3.1.3 Wed May 23 2012 SoSFTrigger(3)