lambda function with "capture by value"

[Stefan Koch via Digitalmars-d-learn]

On Saturday, 5 August 2017 at 18:19:05 UTC, Stefan Koch wrote:
> On Saturday, 5 August 2017 at 18:17:49 UTC, Simon Bürger wrote:
>> If a lambda function uses a local variable, that variable is 
>> captured using a hidden this-pointer. But this capturing is 
>> always by reference. Example:
>>
>>     int i = 1;
>>     auto dg = (){ writefln("%s", i); };
>>     i = 2;
>>     dg(); // prints '2'
>>
>> Is there a way to make the delegate "capture by value" so that 
>> the call prints '1'?
>>
>> Note that in C++, both variants are available using
>>   [&]() { printf("%d", i); }
>> and
>>    [=]() { printf("%d", i); }
>> respectively.
>
> No currently there is not.

and it'd be rather useless I guess.
You want i to be whatever the context i is a the point where you 
call the delegate.
Not at the point where you define the delegate.