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From: David Abrahams (dave_at_[hidden])
Date: 2003-02-20 10:11:22

Gabriel Dos Reis <gdr_at_[hidden]> writes:

> David Abrahams <dave_at_[hidden]> writes:
> | Let me reiterate, just in case somebody missed it: this is a similar
> | problem to that of using a pointer/reference-to-data-member as a
> | template paramter. You can think of each thread-local global variable
> | as a data member in a big struct, of which there's a single instance
> | per thread. The address of this global variable is just as much a
> | constant as the address of a data member. There's no problem here,
> I see your analogy.
> However, my point is that
> * a class is closed: that is, by the time you put the closing brace,
> the "offset" of the data member is a compile-time constant.
> * the number of thread local variables is potentially unbounded,
> meaning that, using your analogy, the offset of the corresponding
> data-member is not known by the time the compiler finishes
> processing a given translation unit.

OK... is that a problem? The address of a static global is not known
when the compiler finishes processing a given translation unit either.

Dave Abrahams
Boost Consulting

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