RTTI Class Reference

#include <RTTI.h>

Classes
struct	BaseClass
	Base class information. More...

Public Types
using	pCreateObjectFunction = void *(*)()
	Function to create an object.
using	pDestructObjectFunction = void(*)(void *inObject)
	Function to destroy an object.
using	pCreateRTTIFunction = void(*)(RTTI &inRTTI)
	Function to initialize the runtime type info structure.

Public Member Functions
	RTTI (const char *inName, int inSize, pCreateObjectFunction inCreateObject, pDestructObjectFunction inDestructObject)
	Constructor.
	RTTI (const char *inName, int inSize, pCreateObjectFunction inCreateObject, pDestructObjectFunction inDestructObject, pCreateRTTIFunction inCreateRTTI)
const char *	GetName () const
void	SetName (const char *inName)
int	GetSize () const
bool	IsAbstract () const
int	GetBaseClassCount () const
const RTTI *	GetBaseClass (int inIdx) const
uint32	GetHash () const
void *	CreateObject () const
	Create an object of this type (returns nullptr if the object is abstract)
void	DestructObject (void *inObject) const
	Destruct object of this type (does nothing if the object is abstract)
void	AddBaseClass (const RTTI *inRTTI, int inOffset)
	Add base class.
bool	operator== (const RTTI &inRHS) const
	Equality operators.
bool	operator!= (const RTTI &inRHS) const
bool	IsKindOf (const RTTI *inRTTI) const
	Test if this class is derived from class of type inRTTI.
const void *	CastTo (const void *inObject, const RTTI *inRTTI) const
	Cast inObject of this type to object of type inRTTI, returns nullptr if the cast is unsuccessful.
void	AddAttribute (const SerializableAttribute &inAttribute)
	Attribute access.
int	GetAttributeCount () const
const SerializableAttribute &	GetAttribute (int inIdx) const

Protected Attributes
const char *	mName
	Class name.
int	mSize
	Class size.
StaticArray< BaseClass, 4 >	mBaseClasses
	Names of base classes.
pCreateObjectFunction	mCreate
	Pointer to a function that will create a new instance of this class.
pDestructObjectFunction	mDestruct
	Pointer to a function that will destruct an object of this class.
StaticArray< SerializableAttribute, 32 >	mAttributes
	All attributes of this class.

Detailed Description

Light weight runtime type information system. This way we don't need to turn on the default RTTI system of the compiler (introducing a possible overhead for every class)

Notes:

• An extra virtual member function is added. This adds 8 bytes to the size of an instance of the class (unless you are already using virtual functions).

To use RTTI on a specific class use:

Header file:

class Foo
{
    JPH_DECLARE_RTTI_VIRTUAL_BASE(Foo)
}

class Bar : public Foo
{
    JPH_DECLARE_RTTI_VIRTUAL(Bar)
};

Implementation file:

JPH_IMPLEMENT_RTTI_VIRTUAL_BASE(Foo)
{
}

JPH_IMPLEMENT_RTTI_VIRTUAL(Bar)
{
    JPH_ADD_BASE_CLASS(Bar, Foo) // Multiple inheritance is allowed, just do JPH_ADD_BASE_CLASS for every base class
}

For abstract classes use:

Header file:

class Foo
{
    JPH_DECLARE_RTTI_ABSTRACT_BASE(Foo)

public:
    virtual void AbstractFunction() = 0;
}

class Bar : public Foo
{
    JPH_DECLARE_RTTI_VIRTUAL(Bar)

public:
    virtual void AbstractFunction() { } // Function is now implemented so this class is no longer abstract
};

Implementation file:

JPH_IMPLEMENT_RTTI_ABSTRACT_BASE(Foo)
{
}

JPH_IMPLEMENT_RTTI_VIRTUAL(Bar)
{
    JPH_ADD_BASE_CLASS(Bar, Foo)
}

Example of usage in a program:

Foo *foo_ptr = new Foo;
Foo *bar_ptr = new Bar;

IsType(foo_ptr, RTTI(Bar)) returns false
IsType(bar_ptr, RTTI(Bar)) returns true

IsKindOf(foo_ptr, RTTI(Bar)) returns false
IsKindOf(bar_ptr, RTTI(Foo)) returns true
IsKindOf(bar_ptr, RTTI(Bar)) returns true

StaticCast<Bar>(foo_ptr) asserts and returns foo_ptr casted to Bar *
StaticCast<Bar>(bar_ptr) returns bar_ptr casted to Bar *

DynamicCast<Bar>(foo_ptr) returns nullptr
DynamicCast<Bar>(bar_ptr) returns bar_ptr casted to Bar *

Other feature of DynamicCast:

class A { int data[5]; };
class B { int data[7]; };
class C : public A, public B { int data[9]; };

C *c = new C;
A *a = c;

Note that:

B *b = (B *)a;

generates an invalid pointer,

B *b = StaticCast<B>(a);

doesn't compile, and

B *b = DynamicCast<B>(a);

does the correct cast

Member Typedef Documentation

pCreateObjectFunction

using RTTI::pCreateObjectFunction = void *(*)()

Function to create an object.

pCreateRTTIFunction

using RTTI::pCreateRTTIFunction = void (*)(RTTI &inRTTI)

Function to initialize the runtime type info structure.

pDestructObjectFunction

using RTTI::pDestructObjectFunction = void (*)(void *inObject)

Function to destroy an object.

Constructor & Destructor Documentation

RTTI() [1/2]

JPH_NAMESPACE_BEGIN RTTI::RTTI	(	const char *	inName,
		int	inSize,
		pCreateObjectFunction	inCreateObject,
		pDestructObjectFunction	inDestructObject
	)

Constructor.

RTTI() [2/2]

RTTI::RTTI	(	const char *	inName,
		int	inSize,
		pCreateObjectFunction	inCreateObject,
		pDestructObjectFunction	inDestructObject,
		pCreateRTTIFunction	inCreateRTTI
	)

Member Function Documentation

AddAttribute()

void RTTI::AddAttribute

(

const SerializableAttribute &

inAttribute

)

Attribute access.

AddBaseClass()

void RTTI::AddBaseClass	(	const RTTI *	inRTTI,
		int	inOffset
	)

Add base class.

CastTo()

const void * RTTI::CastTo	(	const void *	inObject,
		const RTTI *	inRTTI
	)		const

Cast inObject of this type to object of type inRTTI, returns nullptr if the cast is unsuccessful.

CreateObject()

void * RTTI::CreateObject

(

)

const

Create an object of this type (returns nullptr if the object is abstract)

DestructObject()

void RTTI::DestructObject

(

void *

inObject

)

const

Destruct object of this type (does nothing if the object is abstract)

GetAttribute()

const SerializableAttribute & RTTI::GetAttribute

(

int

inIdx

)

const

GetAttributeCount()

int RTTI::GetAttributeCount

(

)

const

GetBaseClass()

const RTTI * RTTI::GetBaseClass

(

int

inIdx

)

const

GetBaseClassCount()

int RTTI::GetBaseClassCount

(

)

const

GetHash()

uint32 RTTI::GetHash

(

)

const

GetName()

const char * RTTI::GetName ( ) const

inline

GetSize()

int RTTI::GetSize ( ) const

inline

IsAbstract()

bool RTTI::IsAbstract ( ) const

inline

IsKindOf()

bool RTTI::IsKindOf

(

const RTTI *

inRTTI

)

const

Test if this class is derived from class of type inRTTI.

operator!=()

bool RTTI::operator!= ( const RTTI &  inRHS ) const

inline

operator==()

bool RTTI::operator==

(

const RTTI &

inRHS

)

const

Equality operators.

SetName()

void RTTI::SetName ( const char *  inName )

inline

Member Data Documentation

mAttributes

StaticArray<SerializableAttribute, 32> RTTI::mAttributes

protected

All attributes of this class.

mBaseClasses

StaticArray<BaseClass, 4> RTTI::mBaseClasses

protected

Names of base classes.

mCreate

pCreateObjectFunction RTTI::mCreate

protected

Pointer to a function that will create a new instance of this class.

mDestruct

pDestructObjectFunction RTTI::mDestruct

protected

Pointer to a function that will destruct an object of this class.

mName

const char* RTTI::mName

protected

Class name.

mSize

int RTTI::mSize

protected

Class size.

---

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

• Jolt/Core/RTTI.h
• Jolt/Core/RTTI.cpp