post/pre-increment/decrement and property

[Timon Gehr]

On 02/07/2012 11:54 PM, Robert Clipsham wrote:
> On 07/02/2012 22:37, Vidar Wahlberg wrote:
>> Take the following code:
>> int _foo;
>> @property auto foo() {
>> return _foo;
>> }
>> @property auto foo(int foo) {
>> return _foo = foo;
>> }
>> void main() {
>> ++foo;
>> }
>>
>>
>> This won't compile, and it sort of makes sense (at least to me), but is
>> it (or will it in the future be) possible to achieve this in some way?
>>
>> I like to encapsulate class/struct members this way so I can easily add
>> validation of the value in the setter at a later time (granted, I can
>> add getter/setter properties when it turns out that I do need to
>> validate the values, but that's beside the point).
>
> Try this:
> ----
> int _foo;
> @property ref foo() {
> return _foo;
> }
> @property ref foo(int foo) {
> return _foo = foo;
> }
> void main() {
> ++foo;
> }
> ----
>
> Using 'ref' instead of auto returns a reference to _foo, allowing it to
> be modified.
>

Yes, but then he cannot verify the new value.