How do casts work under the hood?  I'm mostly interested in what needs to be done in order to cast a class to a subclass.  I'd like to know what is being done to determine whether the object is a valid instance of the cast type.  If the code is implemented in the druntime, a pointer to where it lives would suffice.  Thanks in advance for any help.

On Friday, 1 July 2016 at 15:45:35 UTC, Jonathan Marler wrote:
> How do casts work under the hood?  I'm mostly interested in what needs to be done in order to cast a class to a subclass.  I'd like to know what is being done to determine whether the object is a valid instance of the cast type.  If the code is implemented in the druntime, a pointer to where it lives would suffice.  Thanks in advance for any help.

https://github.com/dlang/druntime/blob/master/src/rt/cast_.d#L62

niptick: on github search then rather look at the results in the issues because in the code you'll get a lot of noise due to the unittests or like in this case because if the keywords.

https://github.com/dlang/druntime/search?q=cast&type=Issues&utf8=%E2%9C%93

On Friday, 1 July 2016 at 17:32:26 UTC, Basile B. wrote:
> On Friday, 1 July 2016 at 15:45:35 UTC, Jonathan Marler wrote:
>> How do casts work under the hood?  I'm mostly interested in what needs to be done in order to cast a class to a subclass.  I'd like to know what is being done to determine whether the object is a valid instance of the cast type.  If the code is implemented in the druntime, a pointer to where it lives would suffice.  Thanks in advance for any help.
>
> https://github.com/dlang/druntime/blob/master/src/rt/cast_.d#L62
>
> niptick

damn, where is the "edit" button ^^

On Friday, 1 July 2016 at 17:34:25 UTC, Basile B. wrote:
> On Friday, 1 July 2016 at 17:32:26 UTC, Basile B. wrote:
>> On Friday, 1 July 2016 at 15:45:35 UTC, Jonathan Marler wrote:
>>> How do casts work under the hood?  I'm mostly interested in what needs to be done in order to cast a class to a subclass.
>>>  I'd like to know what is being done to determine whether the object is a valid instance of the cast type.  If the code is implemented in the druntime, a pointer to where it lives would suffice.  Thanks in advance for any help.
>>
>> https://github.com/dlang/druntime/blob/master/src/rt/cast_.d#L62
>>
>> niptick
>
> damn, where is the "edit" button ^^

You pointed me right to it! Thanks this is exactly what I was looking for.  I figured it was doing something like this but now I have confirmation.