[boost] [fusion] useful as_variant in spirit2

Subject: [boost] [fusion] useful as_variant in spirit2
From: Christian Holmquist (c.holmquist_at_[hidden])
Date: 2009-09-25 15:52:08

Good day everyone,

The function in boost\spirit\home\support\detail\as_variant.hpp seems to
have no dep. on spirit, and it's a useful utility that would fit into
fusion/support/as_variant.hpp>
IIUC it's a meta function that computes a variant<T0, ..., TN> from a fusion
sequence<T0, ..., TN>. I think there's no reason for a runtime counterpart,
i.e. as_variant<Seq>::type is a valid expression but as_variant(Seq) and
result_of::as_variant<Seq>::type is not. Thus, the function is already
complete.

Does it seem reasonable to you to include in fusion? The work of moving it
would be to only update the docs, as spirit2 probably does excessive testing
of this function anyway.
I could collect the docs from other parts of fusion, and put together a
separate test file if needed. All real work is already done, just
presentation and formality that is lacking.

Have a nice weekend,
Christian