08bb8fca41
Failing to instantiatie incomplete types like the Map::iterator in binaryurp Cache's Entry members is allowed by the C++ standard. The rewrite makes it more compliant with other C++ compilers/STLs. And interesting alternative would be to use boost's multi_index_container. git-svn-id: http://svn.apache.org/repos/asf/openoffice/branches/rejuvenate01@1480367 13f79535-47bb-0310-9956-ffa450edef68
98 lines
2.9 KiB
C++
98 lines
2.9 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
|
|
/*
|
|
* This file is part of the LibreOffice project.
|
|
*
|
|
* This Source Code Form is subject to the terms of the Mozilla Public
|
|
* License, v. 2.0. If a copy of the MPL was not distributed with this
|
|
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
|
|
*
|
|
* This file incorporates work covered by the following license notice:
|
|
*
|
|
* Licensed to the Apache Software Foundation (ASF) under one or more
|
|
* contributor license agreements. See the NOTICE file distributed
|
|
* with this work for additional information regarding copyright
|
|
* ownership. The ASF licenses this file to you under the Apache
|
|
* License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0 .
|
|
*/
|
|
|
|
#ifndef INCLUDED_BINARYURP_SOURCE_CACHE_HXX
|
|
#define INCLUDED_BINARYURP_SOURCE_CACHE_HXX
|
|
|
|
#include "sal/config.h"
|
|
|
|
#include <cassert>
|
|
#include <cstddef>
|
|
#include <map>
|
|
#include <list>
|
|
|
|
#include "boost/noncopyable.hpp"
|
|
#include "sal/types.h"
|
|
|
|
namespace binaryurp {
|
|
|
|
namespace cache {
|
|
|
|
enum { size = 256, ignore = 0xFFFF };
|
|
|
|
}
|
|
|
|
template< typename T > class Cache : private boost::noncopyable {
|
|
public:
|
|
typedef sal_uInt16 IdxType;
|
|
|
|
explicit Cache(std::size_t size):
|
|
size_(size)
|
|
{
|
|
assert(size < cache::ignore);
|
|
}
|
|
|
|
IdxType add( const T& rContent, bool* pbFound) {
|
|
assert( pbFound != NULL);
|
|
if( !size_) {
|
|
*pbFound = false;
|
|
return cache::ignore;
|
|
}
|
|
// try to insert into the map
|
|
list_.push_front( rContent); // create a temp entry
|
|
typedef std::pair<typename LruList::iterator, IdxType> MappedType;
|
|
typedef std::pair<typename LruItMap::iterator,bool> MapPair;
|
|
MapPair aMP = map_.insert( MappedType( list_.begin(), 0));
|
|
*pbFound = !aMP.second;
|
|
|
|
if( !aMP.second) { // insertion not needed => found the entry
|
|
list_.pop_front(); // remove the temp entry
|
|
list_.splice( list_.begin(), list_, aMP.first->first); // the found entry is moved to front
|
|
return aMP.first->second;
|
|
}
|
|
|
|
// test insertion successful => it was new so we keep it
|
|
IdxType n = static_cast<IdxType>( map_.size() - 1);
|
|
if( n >= size_) { // cache full => replace the LRU entry
|
|
// find the least recently used element in the map
|
|
typename LruItMap::iterator it = map_.find( --list_.end());
|
|
n = it->second;
|
|
map_.erase( it); // remove it from the map
|
|
list_.pop_back(); // remove from the list
|
|
}
|
|
aMP.first->second = n;
|
|
return n;
|
|
}
|
|
|
|
private:
|
|
typedef std::list<T> LruList; // last recently used list
|
|
typedef typename LruList::iterator LruListIt;
|
|
struct CmpT{ bool operator()( const LruListIt& rA, const LruListIt& rB) const { return (*rA<*rB);}};
|
|
typedef ::std::map< LruListIt, IdxType, CmpT > LruItMap; // a map into a LruList
|
|
|
|
std::size_t size_;
|
|
LruItMap map_;
|
|
LruList list_;
|
|
};
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
|