Hello Anthony,
I will raise once again the question about accepting null. According to
your POC, null is an acceptable value if it is also declared as a default
value. This is problematic for the scalar types, because they can very well
have a different default value.
An example: There is a check box with three states (check, unchecked and
mixed). This is usually translated to a three state boolean (true, false
and null). The default value of the check box is false.
function set_check_box_state( bool state = false ) { ... }
set_check_box_state( null ); // null will be converted to false here...
Therefore, this cannot work, unless the default value becomes null, which
is against the requirements. What I suggest is something like this:
function set_check_box_state( bool? state = false ) { ... }
set_check_box_state( null ); // works fine
In my opinion this is much clearer, as it separates the notions of the type
and that of the default value.
Lazare INEPOLOGLOU
Ingénieur Logiciel
