成员的完整列表，这些成员属于 neforce::format_options,包括所有继承而来的类成员

align	neforce::format_options
alternate	neforce::format_options
fill	neforce::format_options
loc	neforce::format_options
precision	neforce::format_options
show_sign	neforce::format_options
space_sign	neforce::format_options
type	neforce::format_options
uppercase	neforce::format_options
width	neforce::format_options
zero_pad	neforce::format_options