NAME
SbName -
The SbName class stores strings by reference.
The class is used by Coin for storing keywords, names and other
strings. They are stored in a manner where identical strings are
guaranteed to map to the same memory address (as returned by the
SbName::getString() method).
SYNOPSIS
#include <Inventor/SbName.h>
Public Member Functions
SbName (void)
SbName (const char *namestring)
SbName (const SbString &str)
SbName (const SbName &name)
~SbName ()
const char * getString (void) const
int getLength (void) const
int operator! (void) const
operator const char * (void) const
Static Public Member Functions
static SbBool isIdentStartChar (const char c)
static SbBool isIdentChar (const char c)
static SbBool isBaseNameStartChar (const char c)
static SbBool isBaseNameChar (const char c)
static const SbName & empty (void)
Friends
int operator== (const SbName &lhs, const char *rhs)
int operator== (const char *lhs, const SbName &rhs)
int operator== (const SbName &lhs, const SbName &rhs)
int operator!= (const SbName &lhs, const char *rhs)
int operator!= (const char *lhs, const SbName &rhs)
int operator!= (const SbName &lhs, const SbName &rhs)
Detailed Description
The SbName class stores strings by reference.
The class is used by Coin for storing keywords, names and other
strings. They are stored in a manner where identical strings are
guaranteed to map to the same memory address (as returned by the
SbName::getString() method).
The main advantage of storing identical strings to the same memory
address is that it simplifies comparison operations, and particularly
when working with string data as keys in other data structures, like
e.g. in hash (dictionary) tables.
Apart from that, mapping identical strings to the same memory address
can also save on memory resources, and provide run-time optimizations.
String comparisons for SbName objects are very efficient, for instance.
There is an aspect of using SbName instances that it is important to be
aware of: since strings are stored permanently, using SbName instances
in code where there is continually changing strings or the continual
addition of new unique strings will in the end swamp memory resources.
So where possible, use SbString instances instead.
See also:
SbString
Constructor & Destructor Documentation
SbName::SbName (void) This is the default constructor.
SbName::SbName (const char * namestring) Constructor. Adds the namestring
string to the name table.
SbName::SbName (const SbString & str) Constructor. Adds str to the name
table.
SbName::SbName (const SbName & name) Copy constructor.
SbName::~SbName () The destructor.
Member Function Documentation
const char * SbName::getString (void) const This method returns pointer to
character array for the name.
The returned memory pointer for the character string is guaranteed to
be valid for the remaining life time of the process, even after all
SbName instances referencing the string has been destructed.
int SbName::getLength (void) const This method returns the number of
characters in the name.
int SbName::operator! (void) const This unary operator results in FALSE if
the SbName object is non-empty and TRUE if the SbName object is empty.
An empty name contains a null-length string.
SbName::operator const char * (void) const This operator returns a pointer
to the character array for the name string. It is intended for implicit
use. Use SbName::getString() explicitly instead of this operator - it
might be removed later.
See also:
const char * SbName::getString(void)
SbBool SbName::isIdentStartChar (const char c) [static] This method checks
if the c character is a valid identifier start character for a name.
See also:
SbBool SbName::isIdentChar(const char c)
SbBool SbName::isIdentChar (const char c) [static] This method checks if
the c character is a valid character for a name.
See also:
SbBool SbName::isIdentStartChar(const char c)
SbBool SbName::isBaseNameStartChar (const char c) [static] Returns TRUE if
the given character is valid for use as the first character of a name
for an object derived from a class inheriting SoBase.
SoBase derived objects needs to be named in a manner which will not
clash with the special characters reserved as tokens in the syntax
rules of Open Inventor and VRML files.
Legal characters for the first character of an SoBase object name is
underscore (’_’) and any uppercase and lowercase alphabetic character
from the ASCII character set (i.e. A-Z and a-z).
This method is not part of the original Open Inventor API.
See also:
isBaseNameChar()
SbBool SbName::isBaseNameChar (const char c) [static] Returns TRUE if the
given character is valid for use in naming object instances of classes
derived from SoBase.
SoBase derived objects needs to be named in a manner which will not
clash with the special characters reserved as tokens in the syntax
rules of Open Inventor and VRML files.
Legal characters to use for an SoBase object name is any character from
the ASCII character set from and including character 33 (hex 0x21) to
and including 126 (hex 0x7e), except single and double apostrophes, the
plus sign and punctuation, backslash and the curly braces.
This method is not part of the original Open Inventor API.
See also:
isBaseNameStartChar()
const SbName & SbName::empty (void) [static] Returns an empty-string SbName
instance.
Since:
Coin 3.0
Friends And Related Function Documentation
int operator== (const SbName & lhs, const char * rhs) [friend] This
operator checks for equality and returns TRUE if so, and FALSE
otherwise.
int operator== (const char * lhs, const SbName & rhs) [friend] This
operator checks for equality and returns TRUE if so, and FALSE
otherwise.
int operator== (const SbName & lhs, const SbName & rhs) [friend] This
operator checks for equality and returns TRUE if so, and FALSE
otherwise.
int operator!= (const SbName & lhs, const char * rhs) [friend] This
operator checks for inequality and returns TRUE if so, and FALSE if the
names are equal.
int operator!= (const char * lhs, const SbName & rhs) [friend] This
operator checks for inequality and returns TRUE if so, and FALSE if the
names are equal.
int operator!= (const SbName & lhs, const SbName & rhs) [friend] This
operator checks for inequality and returns TRUE if so, and FALSE if the
names are equal.
Author
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