I think there is something that I don't understand about concept
of *properties*. I thing that property is sort of object
attribute that belongs to it. Currently property considered as
two functions: *get* and/or *set*. So we can do two sort of
operations on concept that called *property*: *assign to it* and
*read it*. If property doesn't return reference value all other
manipulations are forbidden. A will illustrate it with example:
import std.datetime, std.stdio;
void main()
{
auto date = Date(1991, 5, 7);
//date.day += 5; //Not working
//date.day++; //Not working
date.day = date.day + 1;
}
Because day property is of ubyte (not reference) type, we can
only read it into some other variable or assign to it, but other
other operations couldn't be done.
It is a common case when I want to increment, decrement or using
some other 'op=' - operation, but it is not working and I get
compile-time error. I always was thinking that
date.day++;
date.day -= 5;
Should be treated as:
date.day = date.day + 1;
date.day = date.day - 5;
if the were not oveloaded. So if we have get and set property
methods I see that it could be calculated and this should working.
Of course I can define return value of get property as *ref* but
in this case I don't understand how I should use it with *setter*
method.
It's interesting to see any thinkings about it.
