Assigning parsers to auto variables

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Spirit Parsers are not designed to be used with auto in Spirit V2.

This is because the underlying Proto expression templates hold references to the temporaries.

You can use

  • qi::copy() (existing in the trunk after boost_1_55_0, not in any released version at this time)
  • boost::proto::deep_copy
  • or BOOST_SPIRIT_AUTO (first coined here)

I’ve written about these things more often on SO: https://stackoverflow.com/search?q=user%3A85371+deep_copy, specifically, this:

Boost Spirit X3 will not have this limitation.

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