PTLib
Version 2.10.10
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Class for ASN Null type. More...
#include <asner.h>
Public Member Functions | |
PASN_Null (unsigned tag=UniversalNull, TagClass tagClass=UniversalTagClass) | |
virtual Comparison | Compare (const PObject &obj) const |
Compare the two objects and return their relative rank. More... | |
virtual PObject * | Clone () const |
Create a copy of the class on the heap. More... | |
virtual void | PrintOn (ostream &strm) const |
Output the contents of the object to the stream. More... | |
virtual PString | GetTypeAsString () const |
Return a string giving the type of the object. More... | |
virtual PINDEX | GetDataLength () const |
virtual PBoolean | Decode (PASN_Stream &) |
virtual void | Encode (PASN_Stream &) const |
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PINDEX | GetObjectLength () const |
virtual PBoolean | IsPrimitive () const |
PBoolean | IsExtendable () const |
void | SetExtendable (PBoolean ext=true) |
TagClass | GetTagClass () const |
unsigned | GetTag () const |
virtual void | SetTag (unsigned newTag, TagClass tagClass=DefaultTagClass) |
void | SetConstraints (ConstraintType type, int value) |
void | SetConstraints (ConstraintType, int lower, MaximumValueTag) |
void | SetConstraints (ConstraintType, MinimumValueTag lower, unsigned upper) |
void | SetConstraints (ConstraintType, MinimumValueTag lower, MaximumValueTag upper) |
void | SetConstraints (ConstraintType type, int lower, unsigned upper) |
virtual void | SetConstraintBounds (ConstraintType type, int lower, unsigned upper) |
virtual void | SetCharacterSet (ConstraintType ctype, const char *charSet) |
virtual void | SetCharacterSet (ConstraintType ctype, unsigned firstChar, unsigned lastChar) |
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virtual | ~PObject () |
virtual PINDEX | HashFunction () const |
This function yields a hash value required by the PDictionary class. More... | |
virtual Comparison | CompareObjectMemoryDirect (const PObject &obj) const |
Determine the byte wise comparison of two objects. More... | |
bool | operator== (const PObject &obj) const |
Compare the two objects. More... | |
bool | operator!= (const PObject &obj) const |
Compare the two objects. More... | |
bool | operator< (const PObject &obj) const |
Compare the two objects. More... | |
bool | operator> (const PObject &obj) const |
Compare the two objects. More... | |
bool | operator<= (const PObject &obj) const |
Compare the two objects. More... | |
bool | operator>= (const PObject &obj) const |
Compare the two objects. More... | |
virtual const char * | GetClass (unsigned ancestor=0) const |
Get the current dynamic type of the object instance. More... | |
PBoolean | IsClass (const char *cls) const |
virtual PBoolean | InternalIsDescendant (const char *clsName) const |
Determine if the dynamic type of the current instance is a descendent of the specified class. More... | |
virtual void | ReadFrom (istream &strm) |
Input the contents of the object from the stream. More... | |
Class for ASN Null type.
PASN_Null::PASN_Null | ( | unsigned | tag = UniversalNull , |
TagClass | tagClass = UniversalTagClass |
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virtual |
Create a copy of the class on the heap.
The exact semantics of the descendent class determine what is required to make a duplicate of the instance. Not all classes can even do a clone operation.
The main user of the clone function is the PDictionary
class as it requires copies of the dictionary keys.
The default behaviour is for this function to assert.
Reimplemented from PObject.
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virtual |
Compare the two objects and return their relative rank.
This function is usually overridden by descendent classes to yield the ranking according to the semantics of the object.
The default function is to use the CompareObjectMemoryDirect()
function to do a byte wise memory comparison of the two objects.
LessThan
, EqualTo
or GreaterThan
according to the relative rank of the objects. Reimplemented from PObject.
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virtual |
Implements PASN_Object.
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virtual |
Implements PASN_Object.
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virtual |
Implements PASN_Object.
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virtual |
Return a string giving the type of the object.
Implements PASN_Object.
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virtual |
Output the contents of the object to the stream.
The exact output is dependent on the exact semantics of the descendent class. This is primarily used by the standard operator<<
function.
The default behaviour is to print the class name.
Reimplemented from PObject.