storagecommon.hpp

/*
 * LMDB Abstraction Layer.
 * Copyright (C) 2023  Yury Gubich <blue@macaw.me>
 *
 * 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/>.
 */
 
#pragma once
 
#include "storagecommon.h"

template<class K, class V>
inline int LMDBAL::StorageCommon::makeStorage(MDB_txn* transaction, bool duplicates) {
    unsigned int flags = MDB_CREATE;
    if constexpr (std::is_integral<K>::value)
        flags |= MDB_INTEGERKEY;
 
    if (duplicates) {
        flags |= MDB_DUPSORT;
 
        if constexpr (std::is_scalar<V>::value)
            flags |= MDB_DUPFIXED;
 
        if constexpr (
            std::is_same<V, uint32_t>::value ||
            std::is_same<V, int32_t>::value ||
            std::is_same<V, uint64_t>::value ||
            std::is_same<V, int64_t>::value
        )                                   //for some reason lmdb breaks if it's not one of these types in MDB_DUPFIXED mode
            flags |= MDB_INTEGERDUP;
    }
 
    return _mdbOpen(transaction, flags);
}

template<class T>
inline std::string LMDBAL::StorageCommon::toString(const T& value) {
    return std::to_string(value);
}

template<>
inline std::string LMDBAL::StorageCommon::toString(const QString& value) {
    return value.toStdString();
}

template<>
inline std::string LMDBAL::StorageCommon::toString(const std::string& value) {
    return value;
}