value_descriptions.h

// SPDX-License-Identifier: MIT
#ifndef VALUE_DESCRIPTIONS_H
#define VALUE_DESCRIPTIONS_H
 
#include <cstdint>
#include <map>
#include <string>
#include <variant>
 
using RawSignalValue = std::variant<std::int64_t, std::uint64_t>;
 
inline RawSignalValue NormalizeValueKey(const RawSignalValue &value) {
    if (const std::int64_t *number = std::get_if<std::int64_t>(&value)) {
        if (*number >= 0)
            return static_cast<std::uint64_t>(*number);
    }
    return value;
}
 
using ValueDescriptions = std::map<RawSignalValue, std::string>;
 
inline const std::string *FindValueDescription(const ValueDescriptions &descriptions,
                                               const RawSignalValue &rawValue) {
    const ValueDescriptions::const_iterator found = descriptions.find(NormalizeValueKey(rawValue));
    return found == descriptions.end() ? nullptr : &found->second;
}
 
#endif