Question about changing std::map serialization format

[eprincen2]

I would like to adjust the way this map is written in json. It seems like this kind of format change is not supported. I tried a bunch of things and unfortunately it doesn't appear straightforward due to the enum serialization. Any suggestions?

enum class InterfaceSlot: uint8_t
{
    CARD1,
    CARD2,
};

enum class InterfaceType: uint8_t
{
    TYPE1,
    TYPE2,
};

NLOHMANN_JSON_SERIALIZE_ENUM( InterfaceSlot, 
{
    {InterfaceSlot::CARD1, "card 1"},
    {InterfaceSlot::CARD2, "card 2"},
})

NLOHMANN_JSON_SERIALIZE_ENUM( InterfaceType, 
{
    {InterfaceType::TYPE1, "type 1"},
    {InterfaceType::TYPE2, "type 2"},
})

struct HardwareData
{
    std::map<InterfaceSlot, InterfaceType> hardwareMap;
};

void to_json(ordered_json& j, const HardwareData& data)
{
    j = data.hardwareMap;
}

void from_json(const ordered_json& j, HardwareData& data)
{
    data.hardwareMap = j.get<std::map<InterfaceSlot, InterfaceType>>();
}


```------------------------------------------------------------

example:

HardwareData data;
data.hardwareMap.emplace(InterfaceSlot::CARD1, InterfaceType::TYPE1);
data.hardwareMap.emplace(InterfaceSlot::CARD2, InterfaceType::TYPE2);

json j;
j["hardware] = data;

Running this and saving to a file yields:

"hardware": [
[
"card 1",
"type 1"
],
[
"card 2",
"type 2"
]
]

What would be preferred for clarity:

"hardware": {
"card 1": "type 1",
"card 2": "type 2"
}

Is there any easy way to do this? I just want to check if there is something simple I am missing.

[eprincen2]

Solved with this:

void to_json(ordered_json& j, const HardwareData& data)
{
    for(auto [slot, type]: data.hardwareMap)
    {
        json slotJson = slot;
        j[slotJson] = type;
    }
}

void from_json(const ordered_json& j, HardwareData& data)
{
    for(auto [slotStr, typeStr] : j.items())
    {
        auto slot = json(slotStr).get<InterfaceSlot>();
        auto type = json(typeStr).get<InterfaceType>();
        data.hardwareMap.emplace(slot, type);
    }
}