Re: Format a JSON string

From: Richard Hodges (hodges.r_at_[hidden])
Date: 2023-02-24 10:38:52

For the quickest response from the maintainers, consider using the slack
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I have also raised this issue.

On Fri, 24 Feb 2023 at 10:48, Pavel Vazharov via Boost-users <
boost-users_at_[hidden]> wrote:

> 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_at_[hidden]> 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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>> Boost-users_at_[hidden]
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>>
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