Change log

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## Change log

This section summarizes significant changes to the Fusion library.

- Sep 27, 2006: Added `boost::tuple` support. (Joel de Guzman)
- Nov 17, 2006: Added `boost::variant` support. (Joel de Guzman)
- Feb 15, 2007: Added functional module. (Tobias Schwinger)
- April 2, 2007: Added struct adapter. (Joel de Guzman)
- May 8, 2007: Added associative struct adapter. (Dan Marsden)
- Dec 20, 2007: Removed `boost::variant` support. After thorough investigation, I think now that the move to make variant a fusion sequence is rather quirky. A variant will always have a size==1 regardless of the number of types it can contain and there's no way to know at compile time what it contains. Iterating over its types is simply wrong. All these imply that the variant is not a fusion sequence. (Joel de Guzman)
- Oct 12, 2009: The accumulator is the first argument to the functor of `fold` and `accumulate`. (Christopher Schmidt)
- Oct 30, 2009: Added support for associative iterators and views. (Christopher Schmidt)