Weird interaction of design choices: Duration + sum

[Steven Schveighoffer]

On 10/13/17 3:24 PM, Steven Schveighoffer wrote:
> On 10/13/17 3:11 PM, jmh530 wrote:
>> On Friday, 13 October 2017 at 18:36:58 UTC, Luís Marques wrote:
>>> [snip]
>>
>> What if it were package instead of private?
> 
> This wouldn't help, sum is in phobos, Duration in druntime.
> 
> The answer is that sum shouldn't be too clever. IMO, initializing to 0 
> should be only done if the type's .init value doesn't match 0. Since 
> only floating points and char/wchar/dchar do this, just do the Seed(0) 
> for those, else use Seed.init.

I take the last part back a bit. Some custom types may default to 
NaN-like values, so Seed(0) is necessary.

What should happen is that sum should test if Seed(0) is viable, and if 
not, use Seed.init.

-Steve