ICU 59.1  59.1
Data Structures | Namespaces | Macros | Typedefs
uobject.h File Reference

C++ API: Common ICU base class UObject. More...

#include "unicode/utypes.h"

Go to the source code of this file.

Data Structures

class  icu::UMemory
 UMemory is the common ICU base class. More...
 
class  icu::UObject
 UObject is the common ICU "boilerplate" class. More...
 

Namespaces

 icu
 File coll.h.
 

Macros

#define UOBJECT_DEFINE_RTTI_IMPLEMENTATION(myClass)
 This is a simple macro to add ICU RTTI to an ICU object implementation. More...
 
#define UOBJECT_DEFINE_ABSTRACT_RTTI_IMPLEMENTATION(myClass)
 This macro adds ICU RTTI to an ICU abstract class implementation. More...
 

Typedefs

typedef void * UClassID
 UClassID is used to identify classes without using the compiler's RTTI. More...
 

Detailed Description

C++ API: Common ICU base class UObject.

Definition in file uobject.h.

Macro Definition Documentation

§ UOBJECT_DEFINE_ABSTRACT_RTTI_IMPLEMENTATION

#define UOBJECT_DEFINE_ABSTRACT_RTTI_IMPLEMENTATION (   myClass)
Value:
UClassID U_EXPORT2 myClass::getStaticClassID() { \
static char classID = 0; \
return (UClassID)&classID; \
}
void * UClassID
UClassID is used to identify classes without using the compiler's RTTI.
Definition: uobject.h:93

This macro adds ICU RTTI to an ICU abstract class implementation.

This macro should be invoked in *.cpp files. The corresponding header should declare getStaticClassID.

Parameters
myClassThe name of the class that needs RTTI defined.
Internal:
Do not use. This API is for internal use only.

Definition at line 312 of file uobject.h.

§ UOBJECT_DEFINE_RTTI_IMPLEMENTATION

#define UOBJECT_DEFINE_RTTI_IMPLEMENTATION (   myClass)
Value:
UClassID U_EXPORT2 myClass::getStaticClassID() { \
static char classID = 0; \
return (UClassID)&classID; \
} \
UClassID myClass::getDynamicClassID() const \
{ return myClass::getStaticClassID(); }
void * UClassID
UClassID is used to identify classes without using the compiler's RTTI.
Definition: uobject.h:93

This is a simple macro to add ICU RTTI to an ICU object implementation.

This does not go into the header. This should only be used in *.cpp files.

Parameters
myClassThe name of the class that needs RTTI defined.
Internal:
Do not use. This API is for internal use only.

Definition at line 295 of file uobject.h.

Typedef Documentation

§ UClassID

typedef void* UClassID

UClassID is used to identify classes without using the compiler's RTTI.

This was used before C++ compilers consistently supported RTTI. ICU 4.6 requires compiler RTTI to be turned on.

Each class hierarchy which needs to implement polymorphic clone() or operator==() defines two methods, described in detail below. UClassID values can be compared using operator==(). Nothing else should be done with them.

In class hierarchies that implement "poor man's RTTI", each concrete subclass implements getDynamicClassID() in the same way:
class Derived {
public:
virtual UClassID getDynamicClassID() const
{ return Derived::getStaticClassID(); }
}

Each concrete class implements getStaticClassID() as well, which allows clients to test for a specific type.

class Derived {
public:
static UClassID U_EXPORT2 getStaticClassID();
private:
static char fgClassID;
}
// In Derived.cpp:
UClassID Derived::getStaticClassID()
{ return (UClassID)&Derived::fgClassID; }
char Derived::fgClassID = 0; // Value is irrelevant
Stable:
ICU 2.0

Definition at line 93 of file uobject.h.