Hello, I welcome the change to enum classes. I have made this transition recently in my project and want to share my experience:
A conversion to bool from enum class is possible via
bool operator!(ResponseType i) { return (i != ResponesType::NONE); }
ResponseType i = f();
if (!i) ;
if (!!i) ; // it is not possible to use 'if (i)'
A comparison is also possible:
bool operator<(BuiltinIconSize lhs, BuiltinIconSize rhs);
For numbers, which are |ed (like CalendarDisplayOptions) your second suggestion
looks promising. But it will be a hack to get
void Calendar::set_display_options(Calendar::DisplayOptions flags);
to accept
calendar.set_display_options(Calendar::DisplayOptions::SHOW_HEADING |
Calendar::DisplayOptions::SHOW_DAY_NAMES);
And it would be good to further disallow
Calendar::DisplayOptions::SHOW_HEADING | UIManager::ItemType::POPUP
Diether
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