symaction

    struct print_action
    {
        template <typename Context>
        void operator()(Context const& ctx) const
        {
            cout << _attr(ctx) << endl;
        }
    };

    auto description = *(char_ - eol) >> eol;
    auto numbers = int_ >> int_ >> int_;
    auto point = double_ >> double_ >> double_;
    auto element = int_ >> *(char_) >> int_ >> int_ >> int_;

    auto points = skip(blank) [
        *(point >> eol)
    ];

    auto elements = skip(blank) [
        *(element >> eol)
    ];

    auto pr = [&] (auto& ctx) {
        cout << "desc = " << _attr(ctx) << endl;
    };

    auto pr2 = [] (auto& ctx) {
        cout << _attr(ctx) << endl;;
    };

    auto input = description[pr]
        >> numbers[pr]
        >> points
        >> elements;

/*
The above works unless I add a symantic action to numbers. '>> numbers' works, 'numbers[pr]' doesn't. Anyone know why?
*/