Re: [boost] [regex] Clearing failures in regex_regress on Tru64/CXX

From: Markus Schöpflin (markus.schoepflin_at_[hidden])
Date: 2005-06-29 02:33:55

John Maddock wrote:

>>Attached patch clears the current failures in regex_regress on Tru64/CXX.
>>
>>Basically it adds an explicit instantiation of a template class needed
>>because otherwise CXX ends up with multiple instances of the static
>>variable used in the class, which is because of the template compilation
>>model chosen for the compiler. As it shouldn't hurt other compilers, I
>>didn't wrap it in #if ... #endif.

[snip]

> Not quite: the explicit instantiation are not legal C++ if applied in more 
> than one translation unit.  If you wrap them in the appropriate #ifdef's 
> then it's probably OK to commit.  (I say probably, because I'm not sure what 
> Tru64 cxx does in other template instantiation modes, I suspect the patch 
> may actually mess some of them up).

Umm, now I'm confused. Why is explicit instantiation in more than one 
translation unit illegal?

Markus