RWUConstSubString

RWUConstSubString allows read-only access to a range of code units within a referenced RWUString. The range is defined by a starting position and an length within the referenced string. For example, the 7th through the 11th elements, inclusive, would have starting position of 7 and an length of 5.

There are no public constructors. RWUConstSubStrings are constructed by various functions of the RWUString class. Typically, substrings are created and used anonymously, then destroyed immediately.

RWUConstSubString performs bounds checking in all methods that accept an offset value. These methods throw RWBoundsErr if an offset exceeds the current bounds of the substring.

Example

#include <rw/i18n/RWUString.h>
#include <rw/i18n/RWUConstSubString.h>
#include <rw/i18n/RWUConversionContext.h>
#include <iostream>

using std::cout;
using std::endl;

int
main()
{
  // Indicate that source and target strings are
  // encoded as Latin-1.
  RWUConversionContext context("Latin-1");

  // Initialize a const Unicode string.
  const RWUString str("  Hello!  ");

  // Print the string and its length.
  cout << "\"" << str << "\" is " << str.length() <<
   " code units long." << endl;

  // Strip off whitespace.  When invoked on a const
  // RWUString, strip() returns an RWUConstSubString.  
  // The assignment operator creates a copy.
  RWUString copy = str.strip(RWUString::Both);

  // Print the result and its length.
  cout << "\"" << copy << "\" is " << copy.length() <<
   " code units long." << endl;

  return 0;
} // main

Results:
========

"  Hello  !" is 10 code units long.
"Hello!" is 6 code units long.

Public Constructors

RWUConstSubString(const RWUConstSubString& sp);

Copy constructor.

Global Operators

RW_SL_IO_STD(ostream&)
operator<<(RW_SL_IO_STD(ostream&) os, const 
           RWUConstSubString& ustr);

Writes the sequence of bytes to ostream that are produced when contents of ustr are converted into the character encoding scheme specified by the currently active target RWUFromUnicodeConversionContext.

If os.width() is greater than the number of code points contained in the source string, the output is padded using a single space fill character (U+0020). If os.width() is less than the number of code points contained the source string, the entire contents of the string are inserted into the output stream. Any padding is inserted after the string if the ios_base::left format flag is set, or before if ios_base::right is set or if neither flag is set.

Throws RWUException to report conversion errors. Throws std::ios_base::failure to report any errors detected while performing stream operations.

bool
operator<(const RWUChar16* lhs, const RWUConstSubString& rhs);

Returns true if lhs is lexigraphically less than rhs; otherwise, false. If the two strings are identical over the length of the shortest string, then the shorter string is considered less than the longer string.

The lhs string must be null-terminated. This method cannot be used to compare strings containing embedded nulls; use RWBasicUString::compareCodeUnits() in that case.

bool
operator<(const RWUConstSubString& lhs, const RWUChar16* rhs);

The rhs string must be null-terminated. This method cannot be used to compare strings containing embedded nulls; use RWBasicUString::compareCodeUnits() in that case.

bool
operator<(const RWUChar32* lhs, const RWUConstSubString& rhs);

The lhs string must be null-terminated. This method cannot be used to compare strings containing embedded nulls; use RWBasicUString::compareCodePoints() in that case.

bool
operator<(const RWUConstSubString& lhs, const RWUChar32* rhs);

The rhs string must be null-terminated. This method cannot be used to compare strings containing embedded nulls; use RWBasicUString::compareCodePoints() in that case.

bool
operator<(const RWUConstSubString& lhs,
          const RWUConstSubString& rhs);
bool
operator<(const RWBasicUString& lhs,
          const RWUConstSubString& rhs);
bool
operator<(const RWUConstSubString& lhs,
          const RWBasicUString& rhs);

bool
operator<=(const RWUChar16* lhs,
           const RWUConstSubString& rhs);

Returns true if lhs has the same length and is lexigraphically identical to rhs; otherwise, false. If the two strings are identical over the length of the shortest string, then the shorter string is considered less than the longer string.

The lhs string must be null-terminated. This method cannot be used to compare strings containing embedded nulls; use RWBasicUString::compareCodeUnits() in that case.

bool
operator<=(const RWUConstSubString& lhs,
           const RWUChar16* rhs);

The rhs string must be null-terminated. This method cannot be used to compare strings containing embedded nulls; use RWBasicUString::compareCodeUnits() in that case.

bool
operator<=(const RWUChar32* lhs,
           const RWUConstSubString& rhs);

The lhs string must be null-terminated. This method cannot be used to compare strings containing embedded nulls; use RWBasicUString::compareCodePoints() in that case.

bool
operator<=(const RWUConstSubString& lhs,
           const RWUChar32* rhs);

The rhs string must be null-terminated. This method cannot be used to compare strings containing embedded nulls; use RWBasicUString::compareCodePoints() in that case.

bool
operator<=(const RWUConstSubString& lhs,
           const RWUConstSubString& rhs);

Returns true if lhs has the same length and is lexigraphically identical to rhs; otherwise, false. Returns true if both substrings are null. If the two strings are identical over the length of the shortest string, then the shorter string is considered less than the longer string.

bool
operator<=(const RWBasicUString& lhs,
           const RWUConstSubString& rhs);
bool
operator<=(const RWUConstSubString& lhs,
           const RWBasicUString& rhs);

bool
operator==(const RWUChar16* lhs,
           const RWUConstSubString& rhs);

Returns true if lhs has the same length and is lexigraphically identical to rhs; otherwise, false.

The lhs string must be null-terminated. This method cannot be used to compare strings containing embedded nulls; use RWBasicUString::compareCodeUnits() in that case.

bool
operator==(const RWUConstSubString& lhs,
           const RWUChar16* rhs);

Returns true if lhs has the same length and is lexigraphically identical to rhs; otherwise, false.

The rhs string must be null-terminated. This method cannot be used to compare strings containing embedded nulls; use RWBasicUString::compareCodeUnits() in that case.

bool
operator==(const RWUChar32* lhs,
           const RWUConstSubString& rhs);

Returns true if lhs has the same length and is lexigraphically identical to rhs; otherwise, false.

The lhs string must be null-terminated. This method cannot be used to compare strings containing embedded nulls; use RWBasicUString::compareCodePoints() in that case.

bool
operator==(const RWUConstSubString& lhs,
           const RWUChar32* rhs);

Returns true if lhs has the same length and is lexigraphically identical to rhs; otherwise, false.

The rhs string must be null-terminated. This method cannot be used to compare strings containing embedded nulls; use RWBasicUString::compareCodePoints() in that case.

bool
operator==(const RWUConstSubString& lhs,
           const RWUConstSubString& rhs);
bool
operator==(const RWBasicUString& lhs,
           const RWUConstSubString& rhs);
bool
operator==(const RWUConstSubString& lhs,
           const RWBasicUString& rhs);

Returns true if lhs has the same length and is lexigraphically identical to rhs; otherwise, false.

bool
operator!=(const RWUChar16* lhs,
           const RWUConstSubString& rhs);

Returns true if lhs does not have the same length as, or lexigraphically differs from, rhs; otherwise, false. This operator represents the logical negation of operator==.

The lhs string must be null-terminated. This method cannot be used to compare strings containing embedded nulls; use RWBasicUString::compareCodeUnits() in that case.

bool
operator!=(const RWUConstSubString& lhs,
           const RWUChar16* rhs);

Returns true if lhs does not have the same length as, or lexigraphically differs from, rhs; otherwise, false. This operator represents the logical negation of operator==.

The rhs string must be null-terminated. This method cannot be used to compare strings containing embedded nulls; use RWBasicUString::compareCodeUnits() in that case.

bool
operator!=(const RWUChar32* lhs,
           const RWUConstSubString& rhs);

Returns true if lhs does not have the same length as, or lexigraphically differs from, rhs; otherwise, false. This operator represents the logical negation of operator==.

The lhs string must be null-terminated. This method cannot be used to compare strings containing embedded nulls; use RWBasicUString::compareCodePoints() in that case.

bool
operator!=(const RWUConstSubString& lhs,
           const RWUChar32* rhs);

Returns true if lhs does not have the same length as, or lexigraphically differs from, rhs; otherwise, false. This operator represents the logical negation of operator==.

The rhs string must be null-terminated. This method cannot be used to compare strings containing embedded nulls; use RWBasicUString::compareCodePoints() in that case.

bool
operator!=(const RWUConstSubString& lhs,
           const RWUConstSubString& rhs);

Returns true if lhs does not have the same length as, or lexigraphically differs from, rhs; otherwise, false. Also returns false if both substrings are invalid. This operator represents the logical negation of operator==.

bool
operator!=(const RWBasicUString& lhs,
           const RWUConstSubString& rhs);
bool
operator!=(const RWUConstSubString& lhs,
           const RWBasicUString& rhs);

Returns true if lhs does not have the same length as, or lexigraphically differs from, rhs; otherwise, false. This operator represents the logical negation of operator==.

bool
operator>=(const RWUConstSubString& lhs,
           const RWUChar16* rhs);

Returns true if lhs is lexigraphically greater than or equal to rhs; otherwise, false. If the two strings are identical over the length of the shortest string, then the longer string is considered greater than the shorter string.

The rhs string must be null-terminated. This method cannot be used to compare strings containing embedded nulls; use RWBasicUString::compareCodeUnits() in that case.

bool
operator>=(const RWUChar16* lhs,
           const RWUConstSubString& rhs);

The lhs string must be null-terminated. This method cannot be used to compare strings containing embedded nulls; use RWBasicUString::compareCodeUnits() in that case.

bool
operator>=(const RWUConstSubString& lhs,
           const RWUChar32* rhs);

The rhs string must be null-terminated. This method cannot be used to compare strings containing embedded nulls; use RWBasicUString::compareCodePoints() in that case.

bool
operator>=(const RWUChar32* lhs,
           const RWUConstSubString& rhs);

The lhs string must be null-terminated. This method cannot be used to compare strings containing embedded nulls; use RWBasicUString::compareCodePoints() in that case.

bool
operator>=(const RWUConstSubString& lhs,
           const RWUConstSubString& rhs);
bool
operator>=(const RWBasicUString& lhs,
           const RWUConstSubString& rhs);
bool
operator>=(const RWUConstSubString& lhs,
           const RWBasicUString& rhs);

bool
operator>(const RWUChar16* lhs, const RWUConstSubString& rhs);

Returns true if lhs is lexigraphically greater than rhs; otherwise, false. If the two strings are identical over the length of the shortest string, then the longer string is considered greater than the shorter string.

The lhs string must be null-terminated. This method cannot be used to compare strings containing embedded nulls; use RWBasicUString::compareCodeUnits() in that case.

bool
operator>(const RWUConstSubString& lhs, const RWUChar16* rhs);

The rhs string must be null-terminated. This method cannot be used to compare strings containing embedded nulls; use RWBasicUString::compareCodeUnits() in that case.

bool
operator>(const RWUChar32* lhs, const RWUConstSubString& rhs);

The lhs string must be null-terminated. This method cannot be used to compare strings containing embedded nulls; use RWBasicUString::compareCodePoints() in that case.

bool
operator>(const RWUConstSubString& lhs, const RWUChar32* rhs);

The rhs string must be null-terminated. This method cannot be used to compare strings containing embedded nulls; use RWBasicUString::compareCodePoints() in that case.

bool
operator>(const RWUConstSubString& lhs,
          const RWUConstSubString& rhs);
bool
operator>(const RWBasicUString& lhs,
          const RWUConstSubString& rhs);
bool
operator>(const RWUConstSubString& lhs,
          const RWBasicUString& rhs);

Public Member Operators

RWUChar16
operator[](size_t offset) const;

Returns the code unit located at index offset within self. The value of offset must be less than length().

Throws RWBoundsErr if self is a null substring, or if offset is greater than or equal to length().

RWUChar16
operator()(size_t offset) const;

Returns the code unit located at index offset within self. The value of offset must be less than length().

Throws RWBoundsErr if self is a null substring, or if offset is greater than or equal to length().

Public Member Functions

size_t
boundsCheckIndex(size_t offset) const;

Throws RWBoundsErr if self is a null substring, or if offset is greater than or equal to length(); otherwise, simply returns offset.

const RWUChar16*
data() const;

Returns a pointer to the string contents referenced by self. The storage referenced by this pointer is owned by the RWUString associated with self. This storage may not be deleted or modified. The pointer becomes invalid if the RWUString is modified or destroyed.

Throws RWBoundsErr if self is a null substring.

bool
isNull() const;

Returns true if the substring defined by self is null or empty; otherwise, false.

size_t
length() const;

Returns the number of code units in the substring defined by self.

size_t
start() const;

Returns the start position of the substring defined by self within the RWUString referenced by self. A return value of RW_NPOS indicates that self is null substring.

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