Delayed const variable initialization

[ketmar via Digitalmars-d-learn]

On Mon, 13 Jul 2015 08:56:05 +0000, Yuxuan Shui wrote:

> On Monday, 13 July 2015 at 07:43:16 UTC, Marc Schütz wrote:
>> On Monday, 13 July 2015 at 07:11:33 UTC, Yuxuan Shui wrote:
>>> How can I do something like this?
>>>
>>> const(A) x;
>>> if (condition) {
>>>   x = func1();
>>> } else {
>>>   x = func2();
>>> }
>>>
>>> This is a valid use case, and to make this work I'll have to use
>>> Rebindable, which is really inconvenient.
>>
>> const(A) = condition ? func1() : func2();
> 
> Well I should have used a more complex example:
> 
> const(A) x;
> if (condition) {
>    //Do some really complicated stuff here x = func1(results);
> } else {
>    //Here too x = func2(results);
> }

as i wrote, what you really want is the ability to assign to `const`, 
which is forbidden in D. initialization of `x` happens at the declaration 
site: `const(A) x = A.init;`

so, no, the design of `const` will not allow you to assign to consts. 
remember, it's not c++ const. chances are, you don't need that `const` at 
all -- as you clearly wants to modify a variable.
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