gecko-dev/xpcom/glue/nsTPtrArray.h

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/* -*- 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 C++ pointer array template.
*
* The Initial Developer of the Original Code is Mozilla Foundation.
* Portions created by the Initial Developer are Copyright (C) 2006
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Jonas Sicking <jonas@sicking.cc>
*
* 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 ***** */
#ifndef nsTPtrArray_h__
#define nsTPtrArray_h__
#include "nsTArray.h"
//
// The templatized array class for storing pointers. The class is based on
// nsTArray and has all the features of that class, in addition to an
// implementation of SafeElementAt that returns null for out of bounds access
//
template<class E, class Alloc=nsTArrayDefaultAllocator>
class nsTPtrArray : public nsTArray<E*, Alloc> {
public:
typedef nsTPtrArray<E, Alloc> self_type;
typedef nsTArray<E*, Alloc> base_type;
typedef typename base_type::size_type size_type;
typedef typename base_type::elem_type elem_type;
typedef typename base_type::index_type index_type;
//
// Initialization methods
//
nsTPtrArray() {}
// Initialize this array and pre-allocate some number of elements.
explicit nsTPtrArray(size_type capacity) {
this->SetCapacity(capacity);
}
// The array's copy-constructor performs a 'deep' copy of the given array.
// @param other The array object to copy.
nsTPtrArray(const self_type& other) {
this->AppendElements(other);
}
//
// Accessor methods
//
// Forward SafeElementAt to avoid shadowing (and warnings thereof)
elem_type& SafeElementAt(index_type i, elem_type& def) {
return base_type::SafeElementAt(i, def);
}
const elem_type& SafeElementAt(index_type i, const elem_type& def) const {
return base_type::SafeElementAt(i, def);
}
// This method provides direct access to the i'th element of the array in
// a bounds safe manner. If the requested index is out of bounds null is
// returned.
// @param i The index of an element in the array.
elem_type SafeElementAt(index_type i) const {
return SafeElementAt(i, nsnull);
}
};
template<class E, PRUint32 N, class Alloc=nsTArrayDefaultAllocator>
class nsAutoTPtrArray : public nsTPtrArray<E, Alloc> {
public:
typedef nsTPtrArray<E, Alloc> base_type;
typedef typename base_type::Header Header;
typedef typename base_type::elem_type elem_type;
nsAutoTPtrArray() {
*base_type::PtrToHdr() = reinterpret_cast<Header*>(&mAutoBuf);
base_type::Hdr()->mLength = 0;
base_type::Hdr()->mCapacity = N;
base_type::Hdr()->mIsAutoArray = 1;
NS_ASSERTION(base_type::GetAutoArrayBuffer() ==
reinterpret_cast<Header*>(&mAutoBuf),
"GetAutoArrayBuffer needs to be fixed");
}
protected:
union {
char mAutoBuf[sizeof(Header) + N * sizeof(elem_type)];
PRUint64 dummy;
};
};
#endif // nsTPtrArray_h__