[Issue 11874] New: __traits(isPOD) does not check base elem of static arrays

d-bugmail at puremagic.com d-bugmail at puremagic.com
Mon Jan 6 02:33:54 PST 2014


https://d.puremagic.com/issues/show_bug.cgi?id=11874

           Summary: __traits(isPOD) does not check base elem of static
                    arrays
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: nobody at puremagic.com
        ReportedBy: ibuclaw at ubuntu.com


--- Comment #0 from Iain Buclaw <ibuclaw at ubuntu.com> 2014-01-06 02:33:52 PST ---
Consider the following:

---
struct CpCtor { this(this) {} }

struct NonPod { CpCtor[4] cpctor; }

/* CpCtor defines a copy construct -> is not POD.  */
static assert(!__traits(isPOD, CpCtor));

/* NonPod has a static array of CpCtor in it field list,
   so user-defined copy semantics apply -> is not POD.  */
static assert(!__traits(isPOD, NonPod));

/* However, a static array of a non-POD type does not trigger __traits(isPOD).
   This seems contrary to the behaviour of above.  */
static assert(!__traits(isPOD, CpCtor[4]));  // fails
static assert(!__traits(isPOD, NonPod[4]));  // fails

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