Boost Fusion/Phoenix を使用して C で構造体メンバーを反復するにはどうすればよいですか?

<code class="cpp">#include <boost/fusion/adapted/struct.hpp>
#include <boost/fusion/include/for_each.hpp>
#include <boost/phoenix/phoenix.hpp>
using boost::phoenix::arg_names::arg1;

struct A {
    int a;
    int b;
    std::string c;
};

BOOST_FUSION_ADAPT_STRUCT(A, (int, a)(int, b)(std::string, c));

void print_struct_value(A* a) {
    boost::fusion::for_each(
        *a,
        std::cout << arg1 << "\n");
}</code>

<code class="cpp">BOOST_FUSION_ADAPT_STRUCT(A, a, b, c);</code>

<code class="cpp">A my_struct = { 1, 42, "Sample String" };
print_struct_value(&my_struct);</code>

1
42
Sample String