string_map.h

// string_map.h

/*    Copyright 2012 10gen Inc.
 *
 *    Licensed 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
 *
 *    Unless required by applicable law or agreed to in writing, software
 *    distributed under the License is distributed on an "AS IS" BASIS,
 *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *    See the License for the specific language governing permissions and
 *    limitations under the License.
 */

#pragma once

#include "mongo/base/string_data.h"
#include "mongo/util/unordered_fast_key_table.h"

namespace mongo {

typedef StringData::Hasher StringMapDefaultHash;

struct StringMapDefaultEqual {
    bool operator()(const StringData& a, const StringData& b) const {
        return a == b;
    }
};

struct StringMapDefaultConvertor {
    StringData operator()(const std::string& s) const {
        return StringData(s);
    }
};

struct StringMapDefaultConvertorOther {
    std::string operator()(const StringData& s) const {
        return s.toString();
    }
};

template <typename V>
class StringMap : public UnorderedFastKeyTable<StringData,   // K_L
                                               std::string,  // K_S
                                               V,            // V
                                               StringMapDefaultHash,
                                               StringMapDefaultEqual,
                                               StringMapDefaultConvertor,
                                               StringMapDefaultConvertorOther> {};
}