Return the value of the option having the specified name. The behavior is undefined unless this handle object has a name option (i.e., 0 <= index(name)), the option has type bool (i.e., OptionType::e_BOOL == type(name)), and the option has a value (i.e., false == value(name).isNull()).
Declared in <balcl_commandline.h>
bool
theBool(std::string_view const& name) const;