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/* $Id: BetterMap.hh 2641 2007-09-02 21:31:02Z flaterco $
BetterMap: std::map plus a const operator[].
Copyright (C) 2006 David Flater.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
// Putting the bodies of the methods in a separate file did not work
// with g++ 3.4.6 / GNU ld version 2.15.92.0.2 20040927.
#include <map>
template <typename KeyT, typename ElmT> class BetterMap:
public std::map<KeyT,ElmT> {
public:
// Allow regular non-const operator[] to continue working.
using std::map<KeyT,ElmT>::operator[];
const ElmT &operator[] (const KeyT &k) const {
typename std::map<KeyT,ElmT>::const_iterator it (find(k));
assert (it != this->end());
return it->second;
}
// The STL included with g++ 4.1.0 provides an at() method in both
// const and non-const versions that throws std::out_of_range if the
// key is not matched. However, at() is not in ISO/IEC 14882:2003
// and it's not in the STL provided with g++ 3.4.6.
};
// Cleanup2006 Done
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