Question

I can compile the employee example code found on this page.

If I extend the structure with 8 more strings like so:

struct employee
{
    int age;
    std::string surname;
    std::string forename;
    std::string a1;
    std::string a2;
    std::string a3;
    std::string a4;
    std::string a5;
    std::string a6;
    std::string a7;
    std::string a8;
    double salary;
};

(And of course I extend the BOOST_FUSION_ADAPT_STRUCT and the grammar as well), then I get the following error, when I try to compile:

../include/boost/fusion/container/vector/convert.hpp:26:13: error: invalid use of incomplete type ‘struct boost::fusion::detail::as_vector<12>’
../include/boost/fusion/container/vector/detail/as_vector.hpp:26:12: error: declaration of ‘struct boost::fusion::detail::as_vector<12>’

I have found that this happens if my struct has > 10 items. Two questions:

1. Why this limitation?
2. How do I work around it?

Any input is welcome.

Answer 1

Define FUSION_MAX_VECTOR_SIZE to whatever cap you want, take a look in boost/fusion/container/vector/limits.hpp for the default define. boost/fusion/container/vector.hppthen conditionally includes pre processed source depending on the cap.