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113 lines
3.3 KiB
C++
Executable File
113 lines
3.3 KiB
C++
Executable File
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/*
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* The contents of this file are subject to the Netscape Public
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* License Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.mozilla.org/NPL/
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* rights and limitations under the License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All
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* Rights Reserved.
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*
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* Contributor(s):
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* Scott Collins <scc@mozilla.org> (original author)
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*
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*/
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#ifndef nsAlgorithm_h___
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#define nsAlgorithm_h___
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#ifndef nsCharTraits_h___
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#include "nsCharTraits.h"
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// for |nsCharSourceTraits|, |nsCharSinkTraits|
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#endif
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#ifndef prtypes_h___
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#include "prtypes.h"
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// for |PRUint32|...
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#endif
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template <class T>
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inline
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const T&
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NS_MIN( const T& a, const T& b )
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{
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return b < a ? b : a;
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}
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template <class T>
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inline
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const T&
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NS_MAX( const T& a, const T& b )
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{
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return a > b ? a : b;
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}
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template <class InputIterator, class T>
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inline
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PRUint32
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NS_COUNT( InputIterator& first, const InputIterator& last, const T& value )
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{
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PRUint32 result = 0;
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for ( ; first != last; ++first )
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if ( *first == value )
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++result;
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return result;
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}
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template <class InputIterator, class OutputIterator>
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inline
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OutputIterator&
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copy_string( InputIterator& first, const InputIterator& last, OutputIterator& result )
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{
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typedef nsCharSourceTraits<InputIterator> source_traits;
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typedef nsCharSinkTraits<OutputIterator> sink_traits;
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while ( first != last )
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{
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PRInt32 count_copied = PRInt32(sink_traits::write(result, source_traits::read(first), source_traits::readable_distance(first, last)));
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NS_ASSERTION(count_copied > 0, "|copy_string| will never terminate");
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source_traits::advance(first, count_copied);
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}
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return result;
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}
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template <class InputIterator, class OutputIterator>
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OutputIterator&
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copy_string_backward( const InputIterator& first, InputIterator& last, OutputIterator& result )
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{
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while ( first != last )
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{
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last.normalize_backward();
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result.normalize_backward();
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PRUint32 lengthToCopy = PRUint32( NS_MIN(last.size_backward(), result.size_backward()) );
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if ( first.fragment().mStart == last.fragment().mStart )
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lengthToCopy = NS_MIN(lengthToCopy, PRUint32(last.get() - first.get()));
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NS_ASSERTION(lengthToCopy, "|copy_string_backward| will never terminate");
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#ifdef _MSC_VER
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// XXX Visual C++ can't stomach 'typename' where it rightfully should
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nsCharTraits<OutputIterator::value_type>::move(result.get()-lengthToCopy, last.get()-lengthToCopy, lengthToCopy);
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#else
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nsCharTraits<typename OutputIterator::value_type>::move(result.get()-lengthToCopy, last.get()-lengthToCopy, lengthToCopy);
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#endif
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last.advance( -PRInt32(lengthToCopy) );
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result.advance( -PRInt32(lengthToCopy) );
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}
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return result;
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}
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#endif // !defined(nsAlgorithm_h___)
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