code><a class="el" href="group__group-Foldable.html#gaa0fde17f3b947a0678a1c0c01232f2cc" title="Equivalent to fold_left; provided for convenience.fold is equivalent to fold_left. However, it is not tag-dispatched on its own because it is just an alias to fold_left. Also note that fold can be called with or without an initial state, just like fold_left: ">boost::hana::fold</a></code>.  
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