Non-throwing version of basic_fixed_buffer

[oktal]

I would like to use fmt::basic_fixed_buffer<CharT> in combination with fmt::writer to format content in a fixed-size buffer.

However, I would like to keep formatting until I reach the capacity of the buffer and be notified when it happens. Currently, I'm relying on the fact that basic_fixed_buffer::grow() throws a std::runtime_error to know whether my buffer is full or not but I think it's not ideal.

I propose non-throwing version of grow() and write functions. For example, I'd like to write:

char buffer[MAX_BODY_SIZE];
fmt::basic_fixed_buffer<char> buf(buffer);
fmt::writer writer(buf);

if (!writer.try_write(sequence_number))
{
    // Do something
}

Thanks.

[vitaut]

basic_fixed_buffer was an artefact of a legacy API and was removed in #902. Please use the format API instead, e.g.

fmt::format_to_n(buffer, MAX_BODY_SIZE, "{}", sequence_number);