NaN to json and back

[martukas]

double val = std::numeric_limits::quiet_NaN();
DBG << "val=" << val;
json j = val;
DBG << "j=" << j.dump();
val = j;
DBG << "val=" << val;

goes like this:

val=nan
j=null
terminate called after throwing an instance of 'std::domain_error'
what(): type must be number, but is null

Could this not be behave nicer?

[nlohmann]

With the code in the develop branch, this works:

int main()
{
    double val = std::numeric_limits<double>::quiet_NaN();
    std::cout << "val=" << val << std::endl;
    json j = val;
    std::cout << "j=" << j.dump() << std::endl;
    val = j;
    std::cout << "val=" << val << std::endl;
}

output:

val=nan
j=null
val=nan

Note the develop branch is unreleased and is subject to changes until version 3.0.0. This behavior of NaN was only introduced recently.

[nlohmann]

@martukas Did you try the develop branch? Could you comment on this?