First, let me say that this looks like a good library. Secondly, let me say
that I have not looked at the implementation... Now, on to the comments :)
1) I'd like to see a short high-level document that compares Boost.Variant
with Boost.Any, showing the advantages and disadvantages of each. This is
so that new Boost users could decide quickly which library to use for a
given problem. This document could then be referenced by the documentation
of both libraries.
2) The Visitor concept brings a couple questions to mind:
a) Why allow modification (termed "persistency" in the docs)? No other
FunctionObject abstraction does, and modern C++ users are well-acquainted
with and used to the associated restrictions on FunctionObjects.
b) Do Boost.Lambda expressions qualify as Visitors? I am not familiar
enough with the implementation of either library to be able to tell...
-Steve
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