Re: [boost] [mpl][fold.html] apply<op, _1, deref<_2> > correction needed.

AMDG Larry Evans wrote:

The vault file:

http://preview.tinyurl.com/cbr9k3

demonstrates the bug. What's the correct value for the ForwardOp arg to iter_fold in http://www.boost.org/doc/libs/1_38_0/libs/mpl/doc/refmanual/fold.html?

I'm very confused. First of all, in the assertions, you probably want boost::mpl::equal_to instead of boost::mpl::equal. Second, I don't see fold or iter_fold at all. Finally, when you use a lambda expression inside another lambda expression, you need to wrap it in protect. mpl::apply<mpl::apply<op_meta_fun_elem<_1, _2>, _1, mpl::deref<_2> >, state0, iter0>::type is guaranteed to behave strangely, because all the placeholders will be substituted by the outermost apply. In Christ, Steven Watanabe