Tao Klerks <tao@xxxxxxxxxx> writes: > 1. Why add an OPT_CALLBACK_F arg handler, rather than keeping a simple > OPT_BOOL arg type? > Because OPT_BOOL always overwrites with either true or false, so in > order to have use_gui_tool retain its "_BY_CONFIG" value in the > absence of an arg, the explicit arg handler function is required. That is exactly why you want to initialize the variable to something other than 0 or 1 (say "-1") and use that as "not explicitly specified from the command line" aka _BY_CONFIG value, isn't it? And once you do so, you do not need callback and you do not need enum. The original "int" can take tri-state, (unspecified = -1, false = 0, true = 1). Am I missing something?
