</code> is a left-associative fold using a binary operation. Given a structure containing <code>x1, ..., xn</code>, a function <code>f</code> and an optional initial state, <code>fold_left</code> applies <code>f</code> as follows.  <a href="group__group-Foldable.html#ga38c6b3f6b1cbadb9b8432a05ff16b7d2">More...</a><br /></td></tr>
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