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POConvert an mpl sequence of sequences into a trie
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2013-02-19T12:55:13.853
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The problem looks simple enough, basically I have a sequence of sequences, something like: <pre><code>typedef mpl::vector< mpl::vector<mpl::_1, mpl::_2>, mpl::vector<mpl::_1, mpl::_2, mpl::_3>, mpl::vector<mpl::_2, mpl::_1>, mpl::vector<mpl::_2, mpl::_2>, mpl::vector<mpl::_2, mpl::_2, mpl::_3> > seq; </code></pre> What I would like to do is to transform this to a trie, the end result being something like: <pre><code>mpl::map< mpl::pair<mpl::_1, mpl::map< mpl::pair<mpl::_2, mpl::map< mpl::pair<TERMINAL, T>, mpl::pair<mpl::_3, mpl::map< mpl::pair<TERMINAL, T> > > > > > > mpl::pair<mpl::_2, mpl::map< mpl::pair<mpl::_1, mpl::map< mpl::pair<TERMINAL, T> > >, mpl::pair<mpl::_2, mpl::map< mpl::pair<TERMINAL, T>, mpl::pair<mpl::_3, mpl::map< mpl::pair<TERMINAL, T> > > > > > > > </code></pre> So, the question is, is this possible (I'm thinking it's not)? If it is possible, which dark spells have I missed? EDIT: In case the above transformation from sequence of sequences to a trie is not clear, let me see if I can state it in plain English (often more difficult.) Basically each sequence within the main sequence is composed of some types (<code>_1</code>, <code>_2</code> etc.) The transformed version is trie where common prefixes are collapsed. May be the attached picture helps.. <img src="https://i.stack.imgur.com/avKb4.png" alt="resulting tree"> EDIT2: Thanks to @Yakk, hopefully now the question is clearer...
Tags
<c++><templates><boost><template-meta-programming><boost-mpl>
Title
Convert an mpl sequence of sequences into a trie
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