xpcom/string/nsTString.cpp

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 nsTAdoptingString_CharT&
   8 nsTAdoptingString_CharT::operator=(const self_type& str)
   9 {
  10   // This'll violate the constness of this argument, that's just
  11   // the nature of this class...
  12   self_type* mutable_str = const_cast<self_type*>(&str);
  13
  14   if (str.mFlags & F_OWNED) {
  15     // We want to do what Adopt() does, but without actually incrementing
  16     // the Adopt count.  Note that we can be a little more straightforward
  17     // about this than Adopt() is, because we know that str.mData is
  18     // non-null.  Should we be able to assert that str is not void here?
  19     NS_ASSERTION(str.mData, "String with null mData?");
  20     Finalize();
  21     mData = str.mData;
  22     mLength = str.mLength;
  23     SetDataFlags(F_TERMINATED | F_OWNED);
  24
  25     // Make str forget the buffer we just took ownership of.
  26     new (mutable_str) self_type();
  27   } else {
  28     Assign(str);
  29
  30     mutable_str->Truncate();
  31   }
  32
  33   return *this;
  34 }
  35
  36 void
  37 nsTString_CharT::Rebind(const char_type* data, size_type length)
  38 {
  39   // If we currently own a buffer, release it.
  40   Finalize();
  41
  42   mData = const_cast<char_type*>(data);
  43   mLength = length;
  44   SetDataFlags(F_TERMINATED);
  45   AssertValidDepedentString();
  46 }
  47