Method write_padded

include/fmt/format.h:4131–4141

  template <typename FormatContext, typename F>
  auto write_padded(FormatContext& ctx, F write) const -> decltype(ctx.out()) {
    if (width_ == 0) return write(ctx.out());
    auto buf = basic_memory_buffer<Char>();
    write(basic_appender<Char>(buf));
    auto specs = format_specs();
    specs.width = width_;
    specs.copy_fill_from(specs_);
    specs.set_align(specs_.align());
    return detail::write<Char>(
        ctx.out(), basic_string_view<Char>(buf.data(), buf.size()), specs);
  }

  auto nested(const T& value) const -> nested_view<T, Char> {
    return nested_view<T, Char>{&formatter_, &value};