Allows some subsection of an RWWString to be addressed by defining a starting position and an extent. More...

#include <rw/wstring.h>

Public Member Functions
	RWWConstSubString (const RWWSubString &str)

	RWWConstSubString (const RWWConstSubString &str)

bool	isNull () const

size_t	length () const

int	operator! () const

wchar_t	operator() (size_t i) const

wchar_t	operator[] (short i) const

wchar_t	operator[] (int i) const

wchar_t	operator[] (long i) const

wchar_t	operator[] (unsigned short i) const

wchar_t	operator[] (unsigned int i) const

wchar_t	operator[] (unsigned long i) const

wchar_t	operator[] (long long i) const

wchar_t	operator[] (unsigned long long i) const

size_t	start () const

Related Functions
(Note that these are not member functions.)
bool	operator!= (const RWWConstSubString &lhs, const wchar_t *rhs)

bool	operator!= (const wchar_t *lhs, const RWWConstSubString &rhs)

bool	operator!= (const RWWConstSubString &lhs, const RWWConstSubString &rhs)

bool	operator== (const RWWConstSubString &lhs, const wchar_t *rhs)

bool	operator== (const wchar_t *lhs, const RWWConstSubString &rhs)

bool	operator== (const RWWConstSubString &lhs, const RWWConstSubString &rhs)

Detailed Description

The class RWWConstSubString allows some subsection of an RWWString to be addressed by defining a starting position and an extent. For example, the 7th through the 11th elements, inclusive, would have a starting position of 7 and an extent of 5. The specification of a starting position and extent can also be done on your behalf by such functions as RWWString::strip(). There are no public constructors other than two that allow you to create an RWWConstSubString from an existing RWWSubString or RWWConstSubString. In general, RWWConstSubString objects are constructed by various functions of the RWWString class and then destroyed immediately.

A zero length substring is one with a defined starting position and an extent of zero. It can be thought of as starting just before the indicated character, but not including it. It can be used as an lvalue. A null substring is also legal and is frequently used to indicate that a requested substring, perhaps through a search, does not exist. A null substring can be detected with member function isNull(). However, it cannot be used as an lvalue.

Synopsis: #include <rw/wstring.h>

RWWString s("test string");

s(6,3); // "tri"

Persistence: None

Example: #include <iostream>

#include <rw/wstring.h>

int main()

{

const RWWString s (L"What I tell you is true.");

std::cout << "Take the string: [" << s << "]\n";

// Create a string from substrings:

const RWWString s2 (s(0, 16) + L"three times " + s(16, 8));

std::cout << "After creating a string from substrings, you have: ["

<< s2 << "]" << std::endl;

return 0;

}

Program output (assuming your platform displays wide characters as US-ASCII if they are in the US-ASCII character set):

Take the string: [What I tell you is true.]

After creating a string from substrings, you have: [What I tell you three times is true.]

Constructor & Destructor Documentation

RWWConstSubString::RWWConstSubString ( const RWWSubString & str )

inline

Constructs an RWWConstSubString from an existing RWWSubString. The resulting substring references the same start and extent of the RWWString associated with str.

Note: The resulting substring instance should not be used if the RWWString associated with str is modified after the substring is instantiated.

RWWConstSubString::RWWConstSubString ( const RWWConstSubString & str )

inline

Copy constructor. The resulting substring references the same start and extent of the RWWString associated with str.

Note: The resulting substring instance should not be used if the RWWString associated with str is modified after the substring is instantiated.

Member Function Documentation

bool RWWConstSubString::isNull ( void ) const

inline

Returns true if this is a null substring.

size_t RWWConstSubString::length ( ) const

inline

Returns the extent (i.e., length) of the substring.

int RWWConstSubString::operator! ( ) const

inline

Returns true if this is a null substring.

wchar_t RWWConstSubString::operator() ( size_t i ) const

inline

Returns the i ^th character of the substring. The index i must be between zero and the length of the substring less one. Bounds checking is enabled by defining the preprocessor macro RWBOUNDS_CHECK before including <rw/wstring.h>.

Exceptions

RWBoundsErr if RWBOUNDS_CHECK is defined and the index is out of range.

wchar_t RWWConstSubString::operator[] ( short i ) const

inline

Returns the i ^th character of the substring. The index i must be between zero and the length of the substring less one. i is converted to a size_t and bounds checking is performed.

Exceptions