Proposal for custom time string formatting in std.datetime

Walter Bright newshound2 at digitalmars.com
Fri Dec 23 01:41:43 PST 2011


On 12/22/2011 11:12 PM, Jonathan M Davis wrote:
> On Thursday, December 22, 2011 21:30:46 Walter Bright wrote:
>> On 12/22/2011 7:13 PM, Jonathan M Davis wrote:
>>> Okay. Assuming that I'm going to try and make TimeZone opaque within
>>> SysTime, does that require a pointer rather than a reference? And I
>>> assume then that the time zone stuff would need to be in a separate
>>> module than SysTime. That being the case, how would SysTime be able to
>>> use the time zone without importing that module? Does the C++ solution
>>> of forward declaring it like
>>>
>>> class TimeZone;
>>>
>>> work in D?
>>
>> It'll still put a reference to TimeZone in the ModuleInfo.
>
> Will that still happen if the TimeZone is used in templated functions? SysTime
> has several functions that use TimeZone explicitly - e.g. the timezone
> property. It needs to be able to take and return a TimeZone. However, it
> _could_ be templatized with an empty template parameter list. Would that avoid
> pulling in the information on TimeZone if those functions aren't instantiated?
> Or would it still pull it in?
>
> - Jonathan M Davis

Templates, after instantiation, are exactly like their non-templated 
equivalents. Before instantiation, they are not even semantically analyzed.


More information about the Digitalmars-d mailing list