gecko/xpcom/string/public/nsTDependentSubstring.h

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 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
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 * IBM Corporation. All Rights Reserved.
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 * Contributor(s):
 *   Scott Collins <scc@mozilla.org> (original author)
 *   Darin Fisher <darin@meer.net>
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  /**
   * nsTDependentSubstring_CharT
   *
   * A string class which wraps an external array of string characters. It
   * is the client code's responsibility to ensure that the external buffer
   * remains valid for a long as the string is alive.
   *
   * NAMES:
   *   nsDependentSubstring for wide characters
   *   nsDependentCSubstring for narrow characters
   */
class nsTDependentSubstring_CharT : public nsTSubstring_CharT
  {
    public:

      typedef nsTDependentSubstring_CharT    self_type;

    public:

      NS_COM void Rebind( const substring_type&, PRUint32 startPos, PRUint32 length = size_type(-1) );

      NS_COM void Rebind( const char_type* start, const char_type* end );

      nsTDependentSubstring_CharT( const substring_type& str, PRUint32 startPos, PRUint32 length = size_type(-1) )
        : substring_type()
        {
          Rebind(str, startPos, length);
        }

      nsTDependentSubstring_CharT( const char_type* start, const char_type* end )
        : substring_type(const_cast<char_type*>(start), PRUint32(end - start), F_NONE) {}

      nsTDependentSubstring_CharT( const const_iterator& start, const const_iterator& end )
        : substring_type(const_cast<char_type*>(start.get()), PRUint32(end.get() - start.get()), F_NONE) {}

      // Create a nsTDependentSubstring to be bound later
      nsTDependentSubstring_CharT()
        : substring_type() {}

      // auto-generated copy-constructor OK (XXX really?? what about base class copy-ctor?)

    private:
        // NOT USED
      void operator=( const self_type& );        // we're immutable, you can't assign into a substring
  };

inline
const nsTDependentSubstring_CharT
Substring( const nsTSubstring_CharT& str, PRUint32 startPos, PRUint32 length = PRUint32(-1) )
  {
    return nsTDependentSubstring_CharT(str, startPos, length);
  }

inline
const nsTDependentSubstring_CharT
Substring( const nsReadingIterator<CharT>& start, const nsReadingIterator<CharT>& end )
  {
    return nsTDependentSubstring_CharT(start.get(), end.get());
  }

inline
const nsTDependentSubstring_CharT
Substring( const CharT* start, const CharT* end )
  {
    return nsTDependentSubstring_CharT(start, end);
  }

inline
const nsTDependentSubstring_CharT
StringHead( const nsTSubstring_CharT& str, PRUint32 count )
  {
    return nsTDependentSubstring_CharT(str, 0, count);
  }

inline
const nsTDependentSubstring_CharT
StringTail( const nsTSubstring_CharT& str, PRUint32 count )
  {
    return nsTDependentSubstring_CharT(str, str.Length() - count, count);
  }