optional fields

[qwertynat]

Nice library!

Is this able to deal with JSON which has optional fields?

[bk192077]

Thanks )

It's not entirely clear what optional means. If this is the case when there is a field in the c++ structure, but there is no field in json, then this field will be initialized with the default value or the value set by the Default option.

[sven-plastwich]

Hey,
yes, great library that helped me getting forward. I have a rest-endpoint (c#) that spits out e.g. the following responses:

1. { "NullableBool":false, "NullableInt":null }
2. { "NullableBool":true, NullableInt:1 }
3. { "NullableBool":null, NullableInt:1 }

So I setup a structure like this:

struct MyStruct {
    std::optional<bool> NullableBool;
    std::optional<int> NullableInt;
};

... and made some assumptions in the StructMappingExceptions (complex-type vs. bool) of the set_bool + set_integral methods and set the value e.g. like this:
set<std::optional<bool>>(o, value, it->second);

I did not dig any deeper yet to check if we could have a type optional<bool> and I do not like my poc - even if it works in all my testcases.