NAME
ost::String -
This is a generic and portable string class.
SYNOPSIS
#include <string.h>
Inherited by ost::SString.
Public Types
typedef size_t size_type
Public Member Functions
String ()
Construct an empty string.
String (const String &original)
Copy constructor.
String (const char *str)
Create a string from a cstring.
String (std::string string)
Create a String from std::string.
String (const String &str, size_t offset, size_t len=npos)
Create a new string from a subset of another string.
String (size_t size, const char *format,...)
Create a string from formatted text input.
String (size_t count, const char fill= ’ ’)
Fill a new string with character data.
virtual ~String ()
Destroy the string.
const char * getIndex (size_t index) const
Get a string pointer to string content based on an indexed offset.
char * getText (void) const
Get the text of a string.
long getValue (long defvalue=0l) const
Get the value of a string.
bool getBool (bool defbool=false) const
Get the bool flag of a string.
const size_t getLength (void) const
Get the assigned length of string.
const size_t getSize (void) const
Get the allocation size of the string variable.
bool isEmpty (void) const
Return true if string is empty.
void resize (size_t size)
Re-allocate buffer space for string.
void clear (void)
Clear the contents of the entire string.
char at (ssize_t offset) const
Return a character at a known offset.
unsigned count (const String &s, size_t offset=0) const
Count the number of occurences of a specific string within our
string.
unsigned count (const char *s, size_t offset=0, size_t len=0) const
Count the number of occurrences of a specific text pattern within
our string.
String token (const char *delim=’ 0r’, size_t offset=0)
Extract a new string as a token from the current string.
size_t find (const String &s, size_t offset=0, unsigned instance=1)
const
Find the index to the nth instance of a substring in our string.
size_t rfind (const String &s, size_t offset=0) const
Find last occurence of a substring in our string.
size_t find (const char *s, size_t offset=0, size_t len=0, unsigned
count=1) const
Find the index to the nth instance of text in our string.
size_t rfind (const char *s, size_t offset=0, size_t len=0) const
Find last occurence of a text in our string.
void trim (const char *cs)
Trim trailing characters from a string.
void chop (const char *cs)
Chop leading characters from a string.
void strip (const char *cs)
Strip lead and trailing characters from a string.
void chop (size_t chars)
Chop n leading characters from a string.
void trim (size_t count)
Trim n trailing characters from a string.
void erase (size_t start, size_t len=npos)
Erase a portion of string.
void insert (size_t start, const char *text, size_t len=0)
Insert text into a string.
void insert (size_t start, const String &str)
Insert other string into our string.
void replace (size_t start, size_t len, const char *text, size_t
count=0)
Replace text at a specific position in the string with new text.
void replace (size_t start, size_t len, const String &string)
Replace text at a specific position in the string with new string,.
size_t find (unsigned instance, const char *text, size_t offset=0,
size_t len=0) const
A more convenient version of find for nth occurences, by putting
the instance first.
size_t find (unsigned instance, const String &string, size_t offset=0)
const
A more convenient version of find for nth occurences, by putting
the instance first.
String substr (size_t start, size_t len) const
Return a new string that contains a specific substring of the
current string.
const char *() index (size_t ind) const
Return an indexed string based on the index, such as from a find.
void compact (void)
Reduce the size of the string allocation to the minimum needed
based on the current effective length.
char * c_str (void) const
Old ANSI C++ compatible string pointer extraction.
operator char * () const
Get our string data through dereference operator.
bool operator! (void) const
Logical test for string empty.
char * text (void) const
Alternate get text method.
char * data (void) const
Alternate get text method.
size_t length (void) const
Get length as if null terminated string.
size_t size (void) const
Get actual length of string data.
size_t capacity (void) const
Get space allocated to hold current string.
bool empty (void) const
Return true if string is empty.
void append (const char *str, size_t count=0)
Append text to the end of the current string.
void append (size_t size, const char *format,...)
Append formatted text to the end of the current string.
void append (const char *str, size_t offset, size_t count)
Append text into the current string.
void add (char c)
Add a character to the end of a string.
void append (const String &str)
Append string to the end of the current string.
const char operator[] (unsigned ind) const
Extract a character by array indexing.
const char * operator= (const char *str)
Assign our string for c string.
String & operator+= (const String &str)
Append operator.
String & operator+= (char c)
Append operator.
String & operator+= (const char *str)
Append operator.
String & operator+= (const std::string &str)
Append operator.
bool operator< (const String &str) const
bool operator< (const char *str) const
bool operator> (const String &str) const
bool operator> (const char *str) const
bool operator<= (const String &str) const
bool operator<= (const char *str) const
bool operator>= (const String &str) const
bool operator>= (const char *str) const
bool operator== (const String &str) const
bool operator== (const char *str) const
bool operator!= (const String &str) const
bool operator!= (const char *str) const
String & operator+= (int i)
Append operator.
String & operator+= (unsigned int i)
String & operator+= (long l)
String & operator+= (unsigned long l)
String & operator+= (float f)
String & operator+= (double d)
String & operator+= (short s)
String & operator+= (unsigned short s)
String & operator= (int i)
Assignment operator.
String & operator= (unsigned int i)
String & operator= (long l)
String & operator= (unsigned long l)
String & operator= (float f)
String & operator= (double d)
String & operator= (short s)
String & operator= (unsigned short s)
String & operator= (const String &original)
bool operator*= (const String &str) const
Test if string is contained in our string.
bool operator*= (const char *str) const
Test if text is contained in our string.
Static Public Attributes
static const size_t npos
Protected Member Functions
bool isBig (void) const
Determine if string is allocated in local variable or an external
reference.
const char * set (const char *str, size_t len=0)
Set the content of the string variable to the specified string
value, and use smart re-allocation strategies if appropriate to
shrink the size of the variable.
void set (const String &str)
Set the content of the string variable to that of another variable.
const char * set (size_t size, const char *format,...)
Set the content of the string variable to that of a formatted
printf style string.
void copy (const String &str)
Impliment the copy constructor, used internally.
void init (void)
Used to initialize a string object.
size_t setSize (size_t size)
Set the size of allocated space in the string variable (capacity)
to a known value.
void setLength (size_t len)
Set the length value of the string content.
virtual int compare (const char *text, size_t len=0, size_t index=0)
const
A derivable low level comparison operator.
size_t search (const char *text, size_t clen=0, size_t offset=0) const
An internal method used to search for a substring starting at a
known offset.
Static Protected Member Functions
static char * getSpace (size_t size)
Used to fetch memory, if needed, based on the size, from the pager,
or the system heap.
Static Protected Attributes
static const unsigned minsize
static const unsigned slotsize
static const unsigned pagesize
static const unsigned slotlimit
static const unsigned slotcount
Friends
class StringObject
class MemPager
String operator+ (const String &s1, const String &s2)
Add two strings and return a temporary object.
String operator+ (const String &s1, const char *s2)
String operator+ (const char *s1, const String &s2)
String operator+ (const String &s1, const char c2)
String operator+ (const char c1, const String &s2)
std::istream & getline (std::istream &is, String &str, char delim= ’0,
size_t size=0)
Fetch input from a std::istream into the current string variable
until either the string variable is filled (based on current
length) or the deliminator is read.
std::ostream & operator<< (std::ostream &os, const String &str)
Stream the content of our string variable directly to a C++
streaming source.
std::istream & operator>> (std::istream &is, String &str)
Stream input into our variable.
int strprintf (String &str, size_t size, const char *format,...)
Print values directly into a string variable.
Detailed Description
This is a generic and portable string class.
It uses optimized memory allocation strategies to efficiently handle
smaller string content by grouping strings into 32 byte aligned slots
that can be re-allocated from a free list directly.
While meant to cover the basic functionality of the ANSI C++ string
class in form and function, this class offers some important
enhancements, including the ability to derive class type specific
versions of itself. The latter might be used to derive a unicode
string, a string for data and time data types, or to add case
insensitive comparisons, for example.
Author:
David Sugar <dyfet@ostel.com> Generic string class.
Member Typedef Documentation
typedef size_t ost::String::size_type
Constructor & Destructor Documentation
ost::String::String ()
Construct an empty string.
ost::String::String (const String & original)
Copy constructor. Parameters:
original string to copy from.
ost::String::String (const char * str)
Create a string from a cstring. Parameters:
str text to set with.
ost::String::String (std::string string)
Create a String from std::string. Parameters:
string from std::string to copy from.
ost::String::String (const String & str, size_t offset, size_t len = npos)
Create a new string from a subset of another string. Parameters:
str reference of source string.
offset offset to start of data in prior string.
len length of our substring.
ost::String::String (size_t size, const char * format, ...)
Create a string from formatted text input. Parameters:
size to allocate for our new string.
format of data to input.
ost::String::String (size_t count, const char fill = ’ ’)
Fill a new string with character data. Parameters:
count size of new string.
fill char to fill string with.
virtual ost::String::~String () [virtual]
Destroy the string. ..
Member Function Documentation
void ost::String::add (char c)
Add a character to the end of a string. Parameters:
c char to add.
void ost::String::append (const String & str)
Append string to the end of the current string. Parameters:
str string to append.
void ost::String::append (const char * str, size_t offset, size_t count)
Append text into the current string. Parameters:
str text to append.
offset offset to overlay.
count size of text to append.
void ost::String::append (size_t size, const char * format, ...)
Append formatted text to the end of the current string. Parameters:
size size of text to append.
format of data to append.
void ost::String::append (const char * str, size_t count = 0)
Append text to the end of the current string. Parameters:
str text to append.
count size of text to append.
char ost::String::at (ssize_t offset) const
Return a character at a known offset. Returns:
character at offset.
char* ost::String::c_str (void) const [inline]
Old ANSI C++ compatible string pointer extraction. Returns:
string data.
size_t ost::String::capacity (void) const [inline]
Get space allocated to hold current string. Returns:
space of memory buffer from heap or local.
void ost::String::chop (size_t chars) [inline]
Chop n leading characters from a string. Parameters:
chars count to chop.
void ost::String::chop (const char * cs) [inline]
Chop leading characters from a string. Parameters:
cs list of chars to chop.
References ost::strchop().
void ost::String::clear (void)
Clear the contents of the entire string.
void ost::String::compact (void) [inline]
Reduce the size of the string allocation to the minimum needed based on
the current effective length.
virtual int ost::String::compare (const char * text, size_t len = 0, size_t
index = 0) const [protected, virtual]
A derivable low level comparison operator. This can be used to create
custom comparison data types in derived string classes.
Returns:
0 if match, or value for ordering.
Parameters:
text text to compare.
len length of text to compare.
index offset from start of string, used in searchs.
void ost::String::copy (const String & str) [protected]
Impliment the copy constructor, used internally. Will always create a
minimum sized string allocation.
Parameters:
str string to copy from.
unsigned ost::String::count (const char * s, size_t offset = 0, size_t len
= 0) const
Count the number of occurrences of a specific text pattern within our
string. Returns:
count of instances.
Parameters:
s text pattern to find
offset offset to start from.
len length of text pattern if specified.
unsigned ost::String::count (const String & s, size_t offset = 0) const
Count the number of occurences of a specific string within our string.
Returns:
count of instances.
Parameters:
s string to test.
offset offset to start from.
char* ost::String::data (void) const [inline]
Alternate get text method. Returns:
string data.
bool ost::String::empty (void) const [inline]
Return true if string is empty.
void ost::String::erase (size_t start, size_t len = npos)
Erase a portion of string. Parameters:
start starting index to erase from.
len number of characters to erase.
size_t ost::String::find (unsigned instance, const String & string, size_t
offset = 0) const [inline]
A more convenient version of find for nth occurences, by putting the
instance first. Parameters:
instance nth instance to look for.
string reference to look for.
offset offset to start at.
References find().
Referenced by find().
size_t ost::String::find (unsigned instance, const char * text, size_t
offset = 0, size_t len = 0) const [inline]
A more convenient version of find for nth occurences, by putting the
instance first. Parameters:
instance nth instance to look for.
text text to look for.
offset offset to start at.
len length of text.
References find().
Referenced by find().
size_t ost::String::find (const char * s, size_t offset = 0, size_t len =
0, unsigned count = 1) const
Find the index to the nth instance of text in our string. Returns:
index of found substring.
Parameters:
s string to search for.
offset offset to start at.
len size of string text.
count instance to look for.
size_t ost::String::find (const String & s, size_t offset = 0, unsigned
instance = 1) const
Find the index to the nth instance of a substring in our string.
Returns:
index of found substring.
Parameters:
s string to search for.
offset offset to start at.
instance instance to look for.
bool ost::String::getBool (bool defbool = false) const
Get the bool flag of a string. Returns:
boolean value.
const char* ost::String::getIndex (size_t index) const
Get a string pointer to string content based on an indexed offset. A
NULL is returned if the index is outsize of range.
Returns:
string content or NULL if invalid index.
Parameters:
index
const size_t ost::String::getLength (void) const
Get the assigned length of string. Returns:
string length.
const size_t ost::String::getSize (void) const
Get the allocation size of the string variable. Returns:
allocation size.
static char* ost::String::getSpace (size_t size) [static, protected]
Used to fetch memory, if needed, based on the size, from the pager, or
the system heap. Returns:
string pointer to space.
Parameters:
size of space needed.
char* ost::String::getText (void) const
Get the text of a string. Returns:
string content.
long ost::String::getValue (long defvalue = 0l) const
Get the value of a string. Returns:
string value as number.
const char*() ost::String::index (size_t ind) const [inline]
Return an indexed string based on the index, such as from a find. If
out of range, a NULL string is returned.
Returns:
pointer to string data from our string,
Parameters:
ind index or offset to use.
void ost::String::init (void) [protected]
Used to initialize a string object.
void ost::String::insert (size_t start, const String & str)
Insert other string into our string. Parameters:
start string offset to insert at.
str string to insert.
void ost::String::insert (size_t start, const char * text, size_t len = 0)
Insert text into a string. Parameters:
start starting offset to insert at.
text text to insert.
len size of text to insert.
bool ost::String::isBig (void) const [inline, protected]
Determine if string is allocated in local variable or an external
reference. Returns:
true if external heap is used.
bool ost::String::isEmpty (void) const
Return true if string is empty. Returns:
true if string is empty string.
size_t ost::String::length (void) const [inline]
Get length as if null terminated string. Returns:
cstring length.
ost::String::operator char * () const [inline]
Get our string data through dereference operator. Returns:
string data.
bool ost::String::operator! (void) const [inline]
Logical test for string empty. Returns:
true if is empty.
bool ost::String::operator!= (const char * str) const
bool ost::String::operator!= (const String & str) const
bool ost::String::operator*= (const char * str) const
Test if text is contained in our string.
bool ost::String::operator*= (const String & str) const
Test if string is contained in our string.
String& ost::String::operator+= (unsigned short s) [inline]
String& ost::String::operator+= (short s) [inline]
String& ost::String::operator+= (double d) [inline]
String& ost::String::operator+= (float f) [inline]
String& ost::String::operator+= (unsigned long l) [inline]
String& ost::String::operator+= (long l) [inline]
String& ost::String::operator+= (unsigned int i) [inline]
String& ost::String::operator+= (int i) [inline]
Append operator.
String& ost::String::operator+= (const std::string & str) [inline]
Append operator.
String& ost::String::operator+= (const char * str) [inline]
Append operator.
String& ost::String::operator+= (char c) [inline]
Append operator.
String& ost::String::operator+= (const String & str) [inline]
Append operator.
bool ost::String::operator< (const char * str) const
bool ost::String::operator< (const String & str) const
bool ost::String::operator<= (const char * str) const
bool ost::String::operator<= (const String & str) const
String& ost::String::operator= (const String & original) [inline]
String& ost::String::operator= (unsigned short s) [inline]
String& ost::String::operator= (short s) [inline]
String& ost::String::operator= (double d) [inline]
String& ost::String::operator= (float f) [inline]
String& ost::String::operator= (unsigned long l) [inline]
String& ost::String::operator= (long l) [inline]
String& ost::String::operator= (unsigned int i) [inline]
String& ost::String::operator= (int i) [inline]
Assignment operator.
const char* ost::String::operator= (const char * str) [inline]
Assign our string for c string.
bool ost::String::operator== (const char * str) const
bool ost::String::operator== (const String & str) const
bool ost::String::operator> (const char * str) const
bool ost::String::operator> (const String & str) const
bool ost::String::operator>= (const char * str) const
bool ost::String::operator>= (const String & str) const
const char ost::String::operator[] (unsigned ind) const [inline]
Extract a character by array indexing. Returns:
character code.
void ost::String::replace (size_t start, size_t len, const String & string)
Replace text at a specific position in the string with new string,.
Parameters:
start starting offset to replace at.
len length of text to remove.
string reference to replace with.
void ost::String::replace (size_t start, size_t len, const char * text,
size_t count = 0)
Replace text at a specific position in the string with new text.
Parameters:
start starting offset to replace at.
len length of text to remove.
text text to replace with.
count size of replacement text.
void ost::String::resize (size_t size)
Re-allocate buffer space for string. Parameters:
size new size to use.
size_t ost::String::rfind (const char * s, size_t offset = 0, size_t len =
0) const
Find last occurence of a text in our string. Returns:
index of last instance found,
Parameters:
s string to search for.
offset offset to start from.
len size of string to look for.
size_t ost::String::rfind (const String & s, size_t offset = 0) const
Find last occurence of a substring in our string. Returns:
index of last instance found,
Parameters:
s string to search for.
offset offset to start from.
size_t ost::String::search (const char * text, size_t clen = 0, size_t
offset = 0) const [protected]
An internal method used to search for a substring starting at a known
offset. Used by find and count methods.
Returns:
npos if fails, or offset to text found.
Parameters:
text text to search for.
clen length of search text.
offset offset to start from.
const char* ost::String::set (size_t size, const char * format, ...)
[protected]
Set the content of the string variable to that of a formatted printf
style string. Parameters:
size of string data to set.
format of string to write into object.
void ost::String::set (const String & str) [protected]
Set the content of the string variable to that of another variable.
Uses the string set method.
Parameters:
str string to copy from.
const char* ost::String::set (const char * str, size_t len = 0) [protected]
Set the content of the string variable to the specified string value,
and use smart re-allocation strategies if appropriate to shrink the
size of the variable. Parameters:
str string to set.
len length of string if passed.
void ost::String::setLength (size_t len) [protected]
Set the length value of the string content. Parameters:
len size in bytes.
size_t ost::String::setSize (size_t size) [protected]
Set the size of allocated space in the string variable (capacity) to a
known value. The value is recomputed and adjusted based on allocation
method.
Parameters:
size in bytes.
size_t ost::String::size (void) const [inline]
Get actual length of string data. Returns:
actual size of string.
void ost::String::strip (const char * cs)
Strip lead and trailing characters from a string. Parameters:
cs list of chars to strip.
String ost::String::substr (size_t start, size_t len) const [inline]
Return a new string that contains a specific substring of the current
string. Returns:
new string.
Parameters:
start starting offset for extracted substring.
len length of substring.
char* ost::String::text (void) const [inline]
Alternate get text method. Returns:
string data.
String ost::String::token (const char * delim = ’ 0r’, size_t offset = 0)
Extract a new string as a token from the current string. Returns:
string containing token.
Parameters:
delim deliminator characters.
offset offset to start from.
void ost::String::trim (size_t count)
Trim n trailing characters from a string. Parameters:
count number of bytes to trim.
void ost::String::trim (const char * cs) [inline]
Trim trailing characters from a string. Parameters:
cs list of chars to trim.
References ost::strtrim().
Friends And Related Function Documentation
std::istream& getline (std::istream & is, String & str, char delim = ’0,
size_t size = 0) [friend]
Fetch input from a std::istream into the current string variable until
either the string variable is filled (based on current length) or the
deliminator is read. Parameters:
is stream to read.
str string to save into.
delim deliminator to use.
size optional size limitor.
friend class MemPager [friend]
String operator+ (const char c1, const String & s2) [friend]
String operator+ (const String & s1, const char c2) [friend]
String operator+ (const char * s1, const String & s2) [friend]
String operator+ (const String & s1, const char * s2) [friend]
String operator+ (const String & s1, const String & s2) [friend]
Add two strings and return a temporary object.
std::ostream& operator<< (std::ostream & os, const String & str) [friend]
Stream the content of our string variable directly to a C++ streaming
source.
std::istream& operator>> (std::istream & is, String & str) [friend]
Stream input into our variable.
friend class StringObject [friend]
int strprintf (String & str, size_t size, const char * format, ...)
[friend]
Print values directly into a string variable. Returns:
character count.
Parameters:
str object reference to use.
size of string required.
format of data.
Member Data Documentation
bool ost::String::big
struct { ... } ost::String::bigstring
char ost::String::length
size_t ost::String::length
struct { ... } ost::String::ministring
const unsigned ost::String::minsize [static, protected]
const size_t ost::String::npos [static]
const unsigned ost::String::pagesize [static, protected]
size_t ost::String::size
const unsigned ost::String::slotcount [static, protected]
const unsigned ost::String::slotlimit [static, protected]
const unsigned ost::String::slotsize [static, protected]
char ost::String::text[(sizeof(char *)+(sizeof(size_t)*2)+1)]
char* ost::String::text
Author
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