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123 lines
4.3 KiB
C++
123 lines
4.3 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim:set ts=2 sw=2 sts=2 et cindent: */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is C++ pointer array template.
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*
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* The Initial Developer of the Original Code is Mozilla Foundation.
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* Portions created by the Initial Developer are Copyright (C) 2006
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Jonas Sicking <jonas@sicking.cc>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#ifndef nsTPtrArray_h__
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#define nsTPtrArray_h__
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#include "nsTArray.h"
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//
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// The templatized array class for storing pointers. The class is based on
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// nsTArray and has all the features of that class, in addition to an
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// implementation of SafeElementAt that returns null for out of bounds access
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//
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template<class E, class Alloc=nsTArrayDefaultAllocator>
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class nsTPtrArray : public nsTArray<E*, Alloc> {
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public:
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typedef nsTPtrArray<E, Alloc> self_type;
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typedef nsTArray<E*, Alloc> base_type;
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typedef typename base_type::size_type size_type;
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typedef typename base_type::elem_type elem_type;
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typedef typename base_type::index_type index_type;
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//
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// Initialization methods
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//
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nsTPtrArray() {}
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// Initialize this array and pre-allocate some number of elements.
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explicit nsTPtrArray(size_type capacity) {
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this->SetCapacity(capacity);
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}
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// The array's copy-constructor performs a 'deep' copy of the given array.
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// @param other The array object to copy.
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nsTPtrArray(const self_type& other) {
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this->AppendElements(other);
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}
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//
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// Accessor methods
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//
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// Forward SafeElementAt to avoid shadowing (and warnings thereof)
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elem_type& SafeElementAt(index_type i, elem_type& def) {
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return base_type::SafeElementAt(i, def);
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}
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const elem_type& SafeElementAt(index_type i, const elem_type& def) const {
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return base_type::SafeElementAt(i, def);
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}
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// This method provides direct access to the i'th element of the array in
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// a bounds safe manner. If the requested index is out of bounds null is
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// returned.
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// @param i The index of an element in the array.
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elem_type SafeElementAt(index_type i) const {
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return SafeElementAt(i, nsnull);
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}
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};
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template<class E, PRUint32 N, class Alloc=nsTArrayDefaultAllocator>
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class nsAutoTPtrArray : public nsTPtrArray<E, Alloc> {
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public:
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typedef nsTPtrArray<E, Alloc> base_type;
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typedef typename base_type::Header Header;
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typedef typename base_type::elem_type elem_type;
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nsAutoTPtrArray() {
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*base_type::PtrToHdr() = reinterpret_cast<Header*>(&mAutoBuf);
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base_type::Hdr()->mLength = 0;
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base_type::Hdr()->mCapacity = N;
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base_type::Hdr()->mIsAutoArray = 1;
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NS_ASSERTION(base_type::GetAutoArrayBuffer() ==
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reinterpret_cast<Header*>(&mAutoBuf),
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"GetAutoArrayBuffer needs to be fixed");
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}
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protected:
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union {
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char mAutoBuf[sizeof(Header) + N * sizeof(elem_type)];
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PRUint64 dummy;
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};
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};
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#endif // nsTPtrArray_h__
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