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# QCString Class Reference

The QCString class provides an abstraction of the classic C zero-terminated char array (char *). More...

`#include <qcstring.h>`

Inherits QByteArray.

List of all member functions.

## Public Members

- QCString ()
- QCString ( int size )
- QCString ( const QCString & s )
- QCString ( const char * str )
- QCString ( const char * str, uint maxsize )
- QCString & operator= ( const QCString & s )
- QCString & operator= ( const char * str )
- bool isNull () const
- bool isEmpty () const
- uint length () const
- bool resize ( uint len )
- bool truncate ( uint pos )
- bool fill ( char c, int len = -1 )
- QCString copy () const
- QCString & sprintf ( const char * format, ... )
- int find ( char c, int index = 0, bool cs = TRUE ) const
- int find ( const char * str, int index = 0, bool cs = TRUE ) const
- int find ( const QRegExp & rx, int index = 0 ) const
- int findRev ( char c, int index = -1, bool cs = TRUE ) const
- int findRev ( const char * str, int index = -1, bool cs = TRUE ) const
- int findRev ( const QRegExp & rx, int index = -1 ) const
- int contains ( char c, bool cs = TRUE ) const
- int contains ( const char * str, bool cs = TRUE ) const
- int contains ( const QRegExp & rx ) const
- QCString left ( uint len ) const
- QCString right ( uint len ) const
- QCString mid ( uint index, uint len = 0xffffffff ) const
- QCString leftJustify ( uint width, char fill = ' ', bool truncate = FALSE ) const
- QCString rightJustify ( uint width, char fill = ' ', bool truncate = FALSE ) const
- QCString lower () const
- QCString upper () const
- QCString stripWhiteSpace () const
- QCString simplifyWhiteSpace () const
- QCString & insert ( uint index, const char * s )
- QCString & insert ( uint index, char c )
- QCString & append ( const char * str )
- QCString & prepend ( const char * s )
- QCString & remove ( uint index, uint len )
- QCString & replace ( uint index, uint len, const char * str )
- QCString & replace ( const QRegExp & rx, const char * str )
- short toShort ( bool * ok = 0 ) const
- ushort toUShort ( bool * ok = 0 ) const
- int toInt ( bool * ok = 0 ) const
- uint toUInt ( bool * ok = 0 ) const
- long toLong ( bool * ok = 0 ) const
- ulong toULong ( bool * ok = 0 ) const
- float toFloat ( bool * ok = 0 ) const
- double toDouble ( bool * ok = 0 ) const
- QCString & setStr ( const char * str )
- QCString & setNum ( short n )
- QCString & setNum ( ushort n )
- QCString & setNum ( int n )
- QCString & setNum ( uint n )
- QCString & setNum ( long n )
- QCString & setNum ( ulong n )
- QCString & setNum ( float n, char f = 'g', int prec = 6 )
- QCString & setNum ( double n, char f = 'g', int prec = 6 )
- bool setExpand ( uint index, char c )
- operator const char * () const
- QCString & operator+= ( const char * str )
- QCString & operator+= ( char c )

## Related Functions

- void * qmemmove ( void * dst, const void * src, uint len )
- char * qstrdup ( const char * src )
- char * qstrcpy ( char * dst, const char * src )
- char * qstrncpy ( char * dst, const char * src, uint len )
- int qstrcmp ( const char * str1, const char * str2 )
- int qstrncmp ( const char * str1, const char * str2, uint len )
- int qstricmp ( const char * str1, const char * str2 )
- int qstrnicmp ( const char * str1, const char * str2, uint len )
- QDataStream & operator<< ( QDataStream & s, const QCString & str )
- QDataStream & operator>> ( QDataStream & s, QCString & str )
- bool operator== ( const QCString & s1, const QCString & s2 )
- bool operator== ( const QCString & s1, const char * s2 )
- bool operator== ( const char * s1, const QCString & s2 )
- bool operator!= ( const QCString & s1, const QCString & s2 )
- bool operator!= ( const QCString & s1, const char * s2 )
- bool operator!= ( const char * s1, const QCString & s2 )
- bool operator< ( const QCString & s1, const char * s2 )
- bool operator< ( const char * s1, const QCString & s2 )
- bool operator<= ( const QCString & s1, const char * s2 )
- bool operator<= ( const char * s1, const QCString & s2 )
- bool operator> ( const QCString & s1, const char * s2 )
- bool operator> ( const char * s1, const QCString & s2 )
- bool operator>= ( const QCString & s1, const char * s2 )
- bool operator>= ( const char * s1, const QCString & s2 )
- const QCString operator+ ( const QCString & s1, const QCString & s2 )
- const QCString operator+ ( const QCString & s1, const char * s2 )
- const QCString operator+ ( const char * s1, const QCString & s2 )
- const QCString operator+ ( const QCString & s, char c )
- const QCString operator+ ( char c, const QCString & s )

## Detailed Description

The QCString class provides an abstraction of the classic C zero-terminated char array (char *).

QCString inherits QByteArray, which is defined as QMemArray<char>.

Since QCString is a QMemArray, it uses explicit sharing with a reference count.

You might use QCString for text that is never exposed to the user. For text the user sees, you should use QString (which provides implicit sharing, Unicode and other internationalization support).

Note that QCString is one of the weaker classes in Qt; its design is flawed (it tries to behave like a more convenient const char *) and as a result, algorithms that use QCString heavily all too often perform badly. For example, append() is O(length()) since it scans for a null terminator, which makes many algorithms that use QCString scale badly.

Note that for the QCString methods that take a `const char *` parameter the results are undefined if the QCString is not zero-terminated. It is legal for the `const char *` parameter to be 0.

A QCString that has not been assigned to anything is null, i.e. both the length and the data pointer is 0. A QCString that references the empty string ("", a single '\0' char) is empty. Both null and empty QCStrings are legal parameters to the methods. Assigning `const char *` 0 to QCString gives a null QCString.

The length() function returns the length of the string; resize() resizes the string and truncate() truncates the string. A string can be filled with a character using fill(). Strings can be left or right padded with characters using leftJustify() and rightJustify(). Characters, strings and regular expressions can be searched for using find() and findRev(), and counted using contains().

Strings and characters can be inserted with insert() and appended with append(). A string can be prepended with prepend(). Characters can be removed from the string with remove() and replaced with replace().

Portions of a string can be extracted using left(), right() and mid(). Whitespace can be removed using stripWhiteSpace() and simplifyWhiteSpace(). Strings can be converted to uppercase or lowercase with upper() and lower() respectively.

Strings that contain numbers can be converted to numbers with toShort(), toInt(), toLong(), toULong(), toFloat() and toDouble(). Numbers can be converted to strings with setNum().

Many operators are overloaded to work with QCStrings. QCString also supports some more obscure functions, e.g. sprintf(), setStr() and setExpand().

> Note on Character Comparisons

> In QCString the notion of uppercase and lowercase and of which character is greater than or less than another character is locale dependent. This affects functions which support a case insensitive option or which compare or lowercase or uppercase their arguments. Case insensitive operations and comparisons will be accurate if both strings contain only ASCII characters. (If `$LC_CTYPE` is set, most Unix systems do "the right thing".) Functions that this affects include contains(), find(), findRev(), operator<(), operator<=(), operator>(), operator>=(), lower() and upper().

Performance note: The QCString methods for QRegExp searching are implemented by converting the QCString to a QString and performing the search on that. This implies a deep copy of the QCString data. If you are going to perform many QRegExp searches on a large QCString, you will get better performance by converting the QCString to a QString yourself, and then searching in the QString.

See also Collection Classes, Implicitly and Explicitly Shared Classes, Text Related Classes and Non-GUI Classes.

## Member Function Documentation

### QCString::QCString ()

Constructs a null string.

See also isNull().

### QCString::QCString ( int size )

Constructs a string with room for size characters, including the '\0'-terminator. Makes a null string if size == 0.

If size > 0, then the first and last characters in the string are initialized to '\0'. All other characters are uninitialized.

See also resize() and isNull().

### QCString::QCString ( const QCString & s )

Constructs a shallow copy s.

See also assign().

### QCString::QCString ( const char * str )

Constructs a string that is a deep copy of str.

If str is 0 a null string is created.

See also isNull().

### QCString::QCString ( const char * str, uint maxsize )

Constructs a string that is a deep copy of str, that is no more than maxsize bytes long including the '\0'-terminator.

Example:

        QCString str( "helloworld", 6 ); // assigns "hello" to str

If str contains a 0 byte within the first maxsize bytes, the resulting QCString will be terminated by this 0. If str is 0 a null string is created.

See also isNull().

### QCString & QCString::append ( const char * str )

Appends string str to the string and returns a reference to the string. Equivalent to operator+=().

### int QCString::contains ( char c, bool cs = TRUE ) const

Returns the number of times the character c occurs in the string.

The match is case sensitive if cs is TRUE, or case insensitive if cs if FALSE.

See also Note on character comparisons.

### int QCString::contains ( const char * str, bool cs = TRUE ) const

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Returns the number of times str occurs in the string.

The match is case sensitive if cs is TRUE, or case insensitive if cs if FALSE.

This function counts overlapping substrings, for example, "banana" contains two occurrences of "ana".

See also findRev() and Note on character comparisons.

### int QCString::contains ( const QRegExp & rx ) const

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Counts the number of overlapping occurrences of rx in the string.

Example:

        QString s = "banana and panama";
        QRegExp r = QRegExp( "a[nm]a", TRUE, FALSE );
        s.contains( r ); // 4 matches

See also find() and findRev().

### QCString QCString::copy () const

Returns a deep copy of this string.

See also detach().

### bool QCString::fill ( char c, int len = -1 )

Fills the string with len bytes of character c, followed by a '\0'-terminator.

If len is negative, then the current string length is used.

Returns FALSE is len is nonnegative and there is not enough memory to resize the string, otherwise TRUE is returned.

### int QCString::find ( char c, int index = 0, bool cs = TRUE ) const

Finds the first occurrence of the character c, starting at position index.

The search is case sensitive if cs is TRUE, or case insensitive if cs is FALSE.

Returns the position of c, or -1 if c could not be found.

See also Note on character comparisons.

Example: network/networkprotocol/nntp.cpp.

### int QCString::find ( const char * str, int index = 0, bool cs = TRUE ) const

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Finds the first occurrence of the string str, starting at position index.

The search is case sensitive if cs is TRUE, or case insensitive if cs is FALSE.

Returns the position of str, or -1 if str could not be found.

See also Note on character comparisons.

### int QCString::find ( const QRegExp & rx, int index = 0 ) const

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Finds the first occurrence of the regular expression rx, starting at position index.

Returns the position of the next match, or -1 if rx was not found.

### int QCString::findRev ( char c, int index = -1, bool cs = TRUE ) const

Finds the first occurrence of the character c, starting at position index and searching backwards.

The search is case sensitive if cs is TRUE, or case insensitive if cs is FALSE.

Returns the position of c, or -1 if c could not be found.

See also Note on character comparisons.

### int QCString::findRev ( const char * str, int index = -1, bool cs = TRUE ) const

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Finds the first occurrence of the string str, starting at position index and searching backwards.

The search is case sensitive if cs is TRUE, or case insensitive if cs is FALSE.

Returns the position of str, or -1 if str could not be found.

See also Note on character comparisons.

### int QCString::findRev ( const QRegExp & rx, int index = -1 ) const

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Finds the first occurrence of the regular expression rx, starting at position index and searching backwards.

Returns the position of the next match (backwards), or -1 if rx was not found.

### QCString & QCString::insert ( uint index, char c )

Inserts character c into the string at position index and returns a reference to the string.

If index is beyond the end of the string, the string is extended with spaces (ASCII 32) to length index and then c is appended.

Example:

        QCString s = "Yes";
        s.insert( 3, '!');                          // s == "Yes!"

See also remove() and replace().

### QCString & QCString::insert ( uint index, const char * s )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Inserts string s into the string at position index.

If index is beyond the end of the string, the string is extended with spaces (ASCII 32) to length index and then s is appended.

        QCString s = "I like fish";
        s.insert( 2, "don't "); // s == "I don't like fish"

        s = "x";                // index 01234
        s.insert( 3, "yz" );    // s == "x  yz"

### bool QCString::isEmpty () const

Returns TRUE if the string is empty, i.e. if length() == 0. An empty string is not always a null string.

See example in isNull().

See also isNull(), length() and size().

### bool QCString::isNull () const

Returns TRUE if the string is null, i.e. if data() == 0. A null string is also an empty string.

Example:

        QCString a;         // a.data() == 0,  a.size() == 0, a.length() == 0
        QCString b == "";   // b.data() == "", b.size() == 1, b.length() == 0
        a.isNull();         // TRUE, because a.data() == 0
        a.isEmpty();        // TRUE, because a.length() == 0
        b.isNull();         // FALSE, because b.data() == ""
        b.isEmpty();        // TRUE, because b.length() == 0

See also isEmpty(), length() and size().

### QCString QCString::left ( uint len ) const

Returns a substring that contains the len leftmost characters of the string.

The whole string is returned if len exceeds the length of the string.

Example:

        QCString s = "Pineapple";
        QCString t = s.left( 4 );                   // t == "Pine"

See also right() and mid().

Example: network/networkprotocol/nntp.cpp.

### QCString QCString::leftJustify ( uint width, char fill = ' ', bool truncate = FALSE ) const

Returns a string of length width (plus one for the terminating '\0') that contains this string and padded with the fill character.

If the length of the string exceeds width and truncate is FALSE, then the returned string is a copy of the string. If the length of the string exceeds width and truncate is TRUE, then the returned string is a left(width).

Example:

        QCString s("apple");
        QCString t = s.leftJustify(8, '.');         // t == "apple..."

See also rightJustify().

### uint QCString::length () const

Returns the length of the string, excluding the '\0'-terminator. Equivalent to calling `strlen(data())`.

Null strings and empty strings have zero length.

See also size(), isNull() and isEmpty().

Example: network/networkprotocol/nntp.cpp.

### QCString QCString::lower () const

Returns a new string that is a copy of this string converted to lower case.

Example:

        QCString s("Credit");
        QCString t = s.lower();                     // t == "credit"

See also upper() and Note on character comparisons.

### QCString QCString::mid ( uint index, uint len = 0xffffffff ) const

Returns a substring that contains len characters of this string, starting at position index.

Returns a null string if the string is empty or if index is out of range. Returns the whole string from index if index+len exceeds the length of the string.

Example:

        QCString s = "Two pineapples";
        QCString t = s.mid( 4, 3 );                 // t == "pin"

See also left() and right().

Example: network/networkprotocol/nntp.cpp.

### QCString::operator const char * () const

Returns the string data.

### QCString & QCString::operator+= ( const char * str )

Appends string str to the string and returns a reference to the string.

### QCString & QCString::operator+= ( char c )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Appends character c to the string and returns a reference to the string.

### QCString & QCString::operator= ( const QCString & s )

Assigns a shallow copy of s to this string and returns a reference to this string.

### QCString & QCString::operator= ( const char * str )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Assigns a deep copy of str to this string and returns a reference to this string.

If str is 0 a null string is created.

See also isNull().

### QCString & QCString::prepend ( const char * s )

Prepend s to the string. Equivalent to insert(0,s).

See also insert().

### QCString & QCString::remove ( uint index, uint len )

Removes len characters starting at position index from the string and returns a reference to the string.

If index is out of range, nothing happens. If index is valid, but index + len is larger than the length of the string, the string is truncated at position index.

        QCString s = "Montreal";
        s.remove( 1, 4 );
        // s == "Meal"

See also insert() and replace().

Example: network/networkprotocol/nntp.cpp.

### QCString & QCString::replace ( uint index, uint len, const char * str )

Replaces len characters starting at position index from the string with str, and returns a reference to the string.

If index is out of range, nothing is removed and str is appended at the end of the string. If index is valid, but index + len is larger than the length of the string, str replaces the rest of the string from position index.

        QCString s = "Say yes!";
        s.replace( 4, 3, "NO" );                    // s == "Say NO!"

See also insert() and remove().

### QCString & QCString::replace ( const QRegExp & rx, const char * str )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Replaces every occurrence of rx in the string with str. Returns a reference to the string.

Example:

        QString s = "banana";
        s.replace( QRegExp("a.*a"), "" );           // becomes "b"

        s = "banana";
        s.replace( QRegExp("^[bn]a"), " " );        // becomes " nana"

        s = "banana";
        s.replace( QRegExp("^[bn]a"), "" );         // NOTE! becomes ""

The last example may be surprising. The semantics are that the regex is applied to the string repeatedly, so first the leading "ba" is removed, then the "na", then the final "na" leaving an empty string.

### bool QCString::resize ( uint len )

Extends or shrinks the string to len bytes, including the '\0'-terminator.

A '\0'-terminator is set at position `len - 1` unless `len == 0`.

Example:

        QCString s = "resize this string";
        s.resize( 7 );                              // s == "resize"

See also truncate().

Example: network/networkprotocol/nntp.cpp.

### QCString QCString::right ( uint len ) const

Returns a substring that contains the len rightmost characters of the string.

The whole string is returned if len exceeds the length of the string.

Example:

        QCString s = "Pineapple";
        QCString t = s.right( 5 );                  // t == "apple"

See also left() and mid().

Example: network/networkprotocol/nntp.cpp.

### QCString QCString::rightJustify ( uint width, char fill = ' ', bool truncate = FALSE ) const

Returns a string of length width (plus one for the terminating '\0') that contains the fill character followed by this string.

If the length of the string exceeds width and truncate is FALSE, then the returned string is a copy of the string. If the length of the string exceeds width and truncate is TRUE, then the returned string is a left(width).

Example:

        QCString s("pie");
        QCString t = s.rightJustify(8, '.');                // t == ".....pie"

See also leftJustify().

### bool QCString::setExpand ( uint index, char c )

Sets the character at position index to c and expands the string if necessary, filling with spaces.

Returns FALSE if index was out of range and the string could not be expanded, otherwise TRUE.

### QCString & QCString::setNum ( double n, char f = 'g', int prec = 6 )

Sets the string to the string representation of the number n and returns a reference to the string.

The format of the string representation is specified by the format character f, and the precision (number of digits after the decimal point) is specified with prec.

The valid formats for f are 'e', 'E', 'f', 'g' and 'G'. The formats are the same as for sprintf(); they are explained in QString::arg().

### QCString & QCString::setNum ( short n )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Sets the string to the string representation of the number n and returns a reference to the string.

### QCString & QCString::setNum ( ushort n )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Sets the string to the string representation of the number n and returns a reference to the string.

### QCString & QCString::setNum ( int n )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Sets the string to the string representation of the number n and returns a reference to the string.

### QCString & QCString::setNum ( uint n )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Sets the string to the string representation of the number n and returns a reference to the string.

### QCString & QCString::setNum ( long n )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Sets the string to the string representation of the number n and returns a reference to the string.

### QCString & QCString::setNum ( ulong n )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Sets the string to the string representation of the number n and returns a reference to the string.

### QCString & QCString::setNum ( float n, char f = 'g', int prec = 6 )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

### QCString & QCString::setStr ( const char * str )

Makes a deep copy of str. Returns a reference to the string.

### QCString QCString::simplifyWhiteSpace () const

Returns a new string that has white space removed from the start and the end, plus any sequence of internal white space replaced with a single space (ASCII 32).

White space means the decimal ASCII codes 9, 10, 11, 12, 13 and 32.

        QCString s = "  lots\t of\nwhite    space ";
        QCString t = s.simplifyWhiteSpace(); // t == "lots of white space"

See also stripWhiteSpace().

### QCString & QCString::sprintf ( const char * format, ... )

Implemented as a call to the native vsprintf() (see the manual for your C library).

If the string is shorter than 256 characters, this sprintf() calls resize(256) to decrease the chance of memory corruption. The string is resized back to its actual length before sprintf() returns.

Example:

        QCString s;
        s.sprintf( "%d - %s", 1, "first" );         // result < 256 chars

        QCString big( 25000 );                      // very long string
        big.sprintf( "%d - %s", 2, longString );    // result < 25000 chars

Warning: All vsprintf() implementations will write past the end of the target string (*this) if the format specification and arguments happen to be longer than the target string, and some will also fail if the target string is longer than some arbitrary implementation limit.

Giving user-supplied arguments to sprintf() is asking for trouble. Sooner or later someone `will` paste a 3000-character line into your application.

### QCString QCString::stripWhiteSpace () const

Returns a new string that has white space removed from the start and the end.

White space means the decimal ASCII codes 9, 10, 11, 12, 13 and 32.

Example:

        QCString s = " space ";
        QCString t = s.stripWhiteSpace();           // t == "space"

See also simplifyWhiteSpace().

### double QCString::toDouble ( bool * ok = 0 ) const

Returns the string converted to a `double` value.

If ok is nonnull, *ok is set to FALSE if the string is not a number, or if it has trailing garbage; otherwise *ok is set to TRUE.

### float QCString::toFloat ( bool * ok = 0 ) const

Returns the string converted to a `float` value.

If ok is nonnull, *ok is set to FALSE if the string is not a number, or if it has trailing garbage; otherwise *ok is set to TRUE.

### int QCString::toInt ( bool * ok = 0 ) const

Returns the string converted to a `int` value.

If ok is nonnull, *ok is set to FALSE if the string is not a number, or if it has trailing garbage; otherwise *ok is set to TRUE.

### long QCString::toLong ( bool * ok = 0 ) const

Returns the string converted to a `long` value.

If ok is nonnull, *ok is set to FALSE if the string is not a number, or if it has trailing garbage; otherwise *ok is set to TRUE.

### short QCString::toShort ( bool * ok = 0 ) const

Returns the string converted to a `short` value.

If ok is nonnull, *ok is set to FALSE if the string is not a number, or if it has trailing garbage; otherwise *ok is set to TRUE.

### uint QCString::toUInt ( bool * ok = 0 ) const

Returns the string converted to an `unsigned int` value.

If ok is nonnull, *ok is set to FALSE if the string is not a number, or if it has trailing garbage; otherwise *ok is set to TRUE.

### ulong QCString::toULong ( bool * ok = 0 ) const

Returns the string converted to an `unsigned long` value.

If ok is nonnull, *ok is set to FALSE if the string is not a number, or if it has trailing garbage; otherwise *ok is set to TRUE.

### ushort QCString::toUShort ( bool * ok = 0 ) const

Returns the string converted to an `unsigned short` value.

If ok is nonnull, *ok is set to FALSE if the string is not a number, or if it has trailing garbage; otherwise *ok is set to TRUE.

### bool QCString::truncate ( uint pos )

Truncates the string at position pos.

Equivalent to calling `resize(pos+1)`.

Example:

        QCString s = "truncate this string";
        s.truncate( 5 );                            // s == "trunc"

See also resize().

### QCString QCString::upper () const

Returns a new string that is a copy of this string converted to upper case.

Example:

        QCString s( "Debit" );
        QCString t = s.upper();                     // t == "DEBIT"

See also lower() and Note on character comparisons.

## Related Functions

### bool operator!= ( const QCString & s1, const QCString & s2 )

Returns TRUE if s1 and s2 are different; otherwise returns FALSE.

Equivalent to qstrcmp(s1, s2) != 0.

### bool operator!= ( const QCString & s1, const char * s2 )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Returns TRUE if s1 and s2 are different; otherwise returns FALSE.

Equivalent to qstrcmp(s1, s2) != 0.

### bool operator!= ( const char * s1, const QCString & s2 )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Returns TRUE if s1 and s2 are different; otherwise returns FALSE.

Equivalent to qstrcmp(s1, s2) != 0.

### const QCString operator+ ( const QCString & s1, const QCString & s2 )

Returns a string which consists of the concatenation of s1 and s2.

### const QCString operator+ ( const QCString & s1, const char * s2 )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Returns a string which consists of the concatenation of s1 and s2.

### const QCString operator+ ( const char * s1, const QCString & s2 )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Returns a string which consists of the concatenation of s1 and s2.

### const QCString operator+ ( const QCString & s, char c )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Returns a string which consists of the concatenation of s and c.

### const QCString operator+ ( char c, const QCString & s )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Returns a string which consists of the concatenation of c and s.

### bool operator< ( const QCString & s1, const char * s2 )

Returns TRUE if s1 is less than s2; otherwise returns FALSE.

Equivalent to qstrcmp(s1, s2) < 0.

See also Note on character comparisons.

### bool operator< ( const char * s1, const QCString & s2 )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Returns TRUE if s1 is less than s2; otherwise returns FALSE.

Equivalent to qstrcmp(s1, s2) < 0.

See also Note on character comparisons.

### QDataStream & operator<< ( QDataStream & s, const QCString & str )

Writes string str to the stream s.

See also Format of the QDataStream operators.

### bool operator<= ( const QCString & s1, const char * s2 )

Returns TRUE if s1 is less than or equal to s2; otherwise returns FALSE.

Equivalent to qstrcmp(s1, s2) <= 0.

See also Note on character comparisons.

### bool operator<= ( const char * s1, const QCString & s2 )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Returns TRUE if s1 is less than or equal to s2; otherwise returns FALSE.

Equivalent to qstrcmp(s1, s2) <= 0.

See also Note on character comparisons.

### bool operator== ( const QCString & s1, const QCString & s2 )

Returns TRUE if s1 and s2 are equal; otherwise returns FALSE.

Equivalent to qstrcmp(s1, s2) == 0.

### bool operator== ( const QCString & s1, const char * s2 )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Returns TRUE if s1 and s2 are equal; otherwise returns FALSE.

Equivalent to qstrcmp(s1, s2) == 0.

### bool operator== ( const char * s1, const QCString & s2 )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Returns TRUE if s1 and s2 are equal; otherwise returns FALSE.

Equivalent to qstrcmp(s1, s2) == 0.

### bool operator> ( const QCString & s1, const char * s2 )

Returns TRUE if s1 is greater than s2; otherwise returns FALSE.

Equivalent to qstrcmp(s1, s2) > 0.

See also Note on character comparisons.

### bool operator> ( const char * s1, const QCString & s2 )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Returns TRUE if s1 is greater than s2; otherwise returns FALSE.

Equivalent to qstrcmp(s1, s2) > 0.

See also Note on character comparisons.

### bool operator>= ( const QCString & s1, const char * s2 )

Returns TRUE if s1 is greater than or equal to s2; otherwise returns FALSE.

Equivalent to qstrcmp(s1, s2) >= 0.

See also Note on character comparisons.

### bool operator>= ( const char * s1, const QCString & s2 )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Returns TRUE if s1 is greater than or equal to s2; otherwise returns FALSE.

Equivalent to qstrcmp(s1, s2) >= 0.

See also Note on character comparisons.

### QDataStream & operator>> ( QDataStream & s, QCString & str )

Reads a string into str from the stream s.

See also Format of the QDataStream operators.

### void * qmemmove ( void * dst, const void * src, uint len )

This function is normally part of the C library. Qt implements memmove() for platforms that do not provide it.

memmove() copies len bytes from src into dst. The data is copied correctly even if src and dst overlap.

### int qstrcmp ( const char * str1, const char * str2 )

A safe strcmp() function.

Compares str1 and str2. Returns a negative value if str1 is less than str2, 0 if str1 is equal to str2 or a positive value if str1 is greater than str2.

Special case I: Returns 0 if str1 and str2 are both null.

Special case II: Returns a random nonzero value if str1 is null or str2 is null (but not both).

See also qstrncmp(), qstricmp(), qstrnicmp() and Note on character comparisons.

### char * qstrcpy ( char * dst, const char * src )

A safe strcpy() function.

Copies all characters up to and including the '\0' from src into dst and returns a pointer to dst.

### char * qstrdup ( const char * src )

Returns a duplicate string.

Allocates space for a copy of src, copies it, and returns a pointer to the copy. If src is null, it immediately returns 0.

The returned string has to be deleted using `delete[]`.

### int qstricmp ( const char * str1, const char * str2 )

A safe stricmp() function.

Compares str1 and str2 ignoring the case.

Returns a negative value if str1 is less than str2, 0 if str1 is equal to str2 or a positive value if str1 is greater than str2.

Special case I: Returns 0 if str1 and str2 are both null.

Special case II: Returns a random nonzero value if str1 is null or str2 is null (but not both).

See also qstrcmp(), qstrncmp(), qstrnicmp() and Note on character comparisons.

### int qstrncmp ( const char * str1, const char * str2, uint len )

A safe strncmp() function.

Compares str1 and str2 up to len bytes.

Returns a negative value if str1 is less than str2, 0 if str1 is equal to str2 or a positive value if str1 is greater than str2.

Special case I: Returns 0 if str1 and str2 are both null.

Special case II: Returns a random nonzero value if str1 is null or str2 is null (but not both).

See also qstrcmp(), qstricmp(), qstrnicmp() and Note on character comparisons.

### char * qstrncpy ( char * dst, const char * src, uint len )

A safe strncpy() function.

Copies all characters up to len bytes from src (or less if src is shorter) into dst and returns a pointer to dst. Guarantees that dst is '\0'-terminated. If src or dst is null, returns 0 immediately.

See also qstrcpy().

### int qstrnicmp ( const char * str1, const char * str2, uint len )

A safe strnicmp() function.

Compares str1 and str2 up to len bytes ignoring the case.

Returns a negative value if str1 is less than str2, 0 if str1 is equal to str2 or a positive value if str1 is greater than str2.

Special case I: Returns 0 if str1 and str2 are both null.

Special case II: Returns a random nonzero value if str1 is null or str2 is null (but not both).

See also qstrcmp(), qstrncmp(), qstricmp() and Note on character comparisons.

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