How can I write from_json for a complex datatype that is not default constructible?

[shikhartanwar]

Hi. This is more of a question rather than a issue.

I have a requirement where I need to create objects from serialized json (serialized using this library only) but those types are not default constructible. I went through the section regarding get() for non-default constructible/non-copyable types but wasn't sure as to how am I supposed to use it for a complex datatype.

Can you please help?

[theodelrieu]

Do you have a small piece of code? What did you try?

Basically you have to open up the namespace nlohmann in your own code, as shown in the section you linked:

namespace mylib
{
struct complex_type
{
  complex_type() = delete;
};
}

namespace nlohmann
{
template <>
struct adl_serializer<mylib::complex_type>
{
  // ... proceed as shown in the section
};
}

[shikhartanwar]

Thanks a lot. I was able to get it to work.