RWClassicWSubString

Module:  Essential Tools Module   Group:  String Processing Classes

Does not inherit

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• Assignment Operators
• Indexing Operators
• Public Member Functions
• Global Logical Operators

Members

isNull() length() operator!()

operator()() operator=() operator[]()

start() toLower() toUpper()

Non-Members

operator!=()

operator==()

#include <rw/wstring.h>
RWWString s(L"test string");
s(6,3);   // "tri"

---

NOTE -- Use this class instead of RWWSubString only if Technical Support has advised you to do so.

---

The class RWClassicWSubString allows some subsection of an RWClassicWString to be addressed by defining a starting position and an extent.

For more information, see RWWSubString.

None

#include <rw/rstream.h>
#include <rw/wstring.h>

main(){
 RWClassicWString s(L"What I tell you is true.");
 // Create a substring and use it as an lvalue:
 s(16,0) = RWClassicWString(L"three times ");
 cout << s << endl;
 return 0;
}

Program output:

What I tell you three times is true.

void
operator=(const RWClassicWString&);
operator=(const RWClassicWSubString&);

Assignment from an RWClassicWString. The statements:

RWClassicWString a;
RWClassicWString b;
...
b(2, 3) = a;

copy a's data into the substring b(2,3). The number of elements need not match: if they differ, b is resized appropriately. If self is the null substring, then the statement has no effect.

void
operator=(const wchar_t*);

Assignment from a wide character string. Example:

RWClassicWString wstr(L"Mary had a little lamb");
wchar_t dat[] = L"Perrier";
wstr(11,4) = dat;   // "Mary had a Perrier"

Note that the number of characters selected need not match: if they differ, wstr will be resized appropriately. If self is the null substring, then the statement has no effect.

wchar_t
operator[](size_t i); 
wchar_t&
operator[](size_t i) const;

Returns the ith character of the substring. The first variant can be used as an lvalue, the second cannot. The index i must be between zero and the length of the substring less one. Bounds checking is performed: if the index is out of range, then an exception of type RWBoundsErr is thrown.

wchar_t
operator()(size_t i); 
wchar_t&
operator()(size_t i) const;

Returns the ith character of the substring. The first variant can be used as an lvalue, the second cannot. The index i must be between zero and the length of the substring less one. Bounds checking is enabled by defining the pre-processor macro RWBOUNDS_CHECK before including <rw/wstring.h>. In that case, if the index is out of range, then an exception of type RWBoundsErr is thrown.

bool
isNull() const; 

Returns true if this is a null substring.

size_t
length() const; 

Returns the extent (length) of the RWClassicWSubString.

bool
operator!() const; 

Returns true if this is a null substring.

size_t
start() const; 

Returns the starting element of the RWClassicWSubString.

void
toLower();

Changes all upper-case letters in self to lower-case. Uses the C library function towlower().

void
toUpper();

Changes all lower-case letters in self to upper-case. Uses the C library function towupper().

bool
operator==(const RWClassicWSubString&, 
            const RWClassicWSubString&);
bool
operator==(const RWClassicWString&,    
            const RWClassicWSubString&);
bool
operator==(const RWClassicWSubString&, 
            const RWClassicWString&   );
bool
operator==(const wchar_t*,      const RWClassicWSubString&);
bool
operator==(const RWClassicWSubString&, const wchar_t*     );

Returns true if the substring is lexicographically equal to the wide character string or RWClassicWString argument. Case sensitivity is exact.

bool
operator!=(const RWClassicWString&,    
            const RWClassicWString&   ); 
bool
operator!=(const RWClassicWString&,    
            const RWClassicWSubString&);
bool
operator!=(const RWClassicWSubString&,  
            const RWClassicWString&   );
bool
operator!=(const wchar_t*,        
            const RWClassicWString&   );
bool
operator!=(const RWClassicWString&,    
            const wchar_t*            );

Returns the negation of the respective operator==()

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