Hi there,

Looking at the source code of boost::json this behavior doesn't seem customizable because it calls - detail::format_double in serializer::write_number and the former further calls ryu::d2s_buffered_n. I could be missing something here, though. So it's probably better to wait for more opinions on the subject.

On the other hand, you can always serialize the json::value manually in a way similar to the one shown in this example - https://www.boost.org/doc/libs/1_81_0/libs/json/doc/html/json/examples.html#json.examples.pretty.

This way you'll have control how exactly you want to display the float values.

HTH,

Pavel.

On Fri, Feb 24, 2023 at 11:25 AM Markus Pieper via Boost-users <boost-users@lists.boost.org> wrote:

Hi there,

I convert a std::vector<std::vector<float>> to a JSON string. Basically it works, but the format is scientific:
"[[1.017E3,1.017E3,1.017E3 ... ]]"

My method looks now like this:

std::string Class::convertFieldAsJSON(std::vector<std::vector<float>> field) {
  return boost::json::serialize(boost::json::value_from(field));
}

It works, but my colleagues want to see a 1017 and not 1.017E3 in the output.
Is there a way to format the string?

Thanks in advance,
Markus

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