Mozilla/mozilla/xpcom/string/src/nsTString.cpp

72 lines
2.8 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim:set ts=2 sw=2 sts=2 et cindent: */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Mozilla.
*
* The Initial Developer of the Original Code is IBM Corporation.
* Portions created by IBM Corporation are Copyright (C) 2003
* IBM Corporation. All Rights Reserved.
*
* Contributor(s):
* Darin Fisher <darin@meer.net>
* Johnny Stenback <jst@mozilla.jstenback.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
NS_COM nsTAdoptingString_CharT&
nsTAdoptingString_CharT::operator=( const self_type& str )
{
// This'll violate the constness of this argument, that's just
// the nature of this class...
self_type* mutable_str = const_cast<self_type*>(&str);
if (str.mFlags & F_OWNED)
{
// We want to do what Adopt() does, but without actually incrementing
// the Adopt count. Note that we can be a little more straightforward
// about this than Adopt() is, because we know that str.mData is
// non-null. Should we be able to assert that str is not void here?
NS_ASSERTION(str.mData, "String with null mData?");
Finalize();
mData = str.mData;
mLength = str.mLength;
SetDataFlags(F_TERMINATED | F_OWNED);
// Make str forget the buffer we just took ownership of.
new (mutable_str) self_type();
}
else
{
Assign(str);
mutable_str->Truncate();
}
return *this;
}