bson-helper.cpp

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/*
 * This file is part of KnowRob, please consult
 * https://github.com/knowrob/knowrob for license details.
 */
 
#include <clocale>
#include "knowrob/storage/mongo/bson-helper.h"
 
namespace knowrob::mongo {
    std::optional<double> bson_iterOptionalDouble(const bson_iter_t *iter) {
        auto iterType = bson_iter_type(iter);
        if (iterType == BSON_TYPE_DECIMAL128) {
            bson_decimal128_t decimal;
            bson_iter_decimal128(iter, &decimal);
            if (decimal.high == 0x7800000000000000 || decimal.high == 0xf800000000000000) {
                // infinity
                return std::nullopt;
            } else {
                char buffer[BSON_DECIMAL128_STRING];
                bson_decimal128_to_string(&decimal, buffer);
                setlocale(LC_NUMERIC, "C");
                auto val = atof(buffer);
                setlocale(LC_NUMERIC, "");
                return val;
            }
        } else if (iterType == BSON_TYPE_DOUBLE) {
            return bson_iter_double(iter);
        } else {
            return std::nullopt;
        }
    }
}