Function vsprintf

extlibs/fmt/include/fmt/printf.h:604–610

template <typename S, typename Char = char_t<S>>
inline std::basic_string<Char> vsprintf(
    const S& format,
    basic_format_args<basic_printf_context_t<type_identity_t<Char>>> args) {
  basic_memory_buffer<Char> buffer;
  printf(buffer, to_string_view(format), args);
  return to_string(buffer);
}

/**
  \rst