Pop Quiz what is wrong with this code?

[Steven Schveighoffer]

On 6/20/20 7:36 PM, Avrina wrote:
> On Saturday, 20 June 2020 at 18:15:27 UTC, Steven Schveighoffer wrote:
>> On 6/20/20 12:00 PM, Danni Coy wrote:
>>
>>> I tried explicitly making x and y ints and I got a depreciation warning.
>>
>> foreach(ptrdiff_t y, ref row; offsetMap)
>>
>> is that what you wanted?
>>
>> ptrdiff_t is the signed version of size_t. The complaint is not that 
>> you are converting from unsigned to signed, but that you are 
>> converting from 64-bit to 32-bit.
>>
> 
> Why isn't that deprecated as well? implicitly converting from ulong to 
> long is an error as much as ulong to uint.

It's not an error as you don't lose information.

In this case, you are losing nothing, as there are no systems with 
exabytes of RAM (i.e. an array size will never be big enough to overflow 
a long).

-Steve