Since you are using boost::variant
, what is wrong about using its recursive wrappers ?
You can see a short example in the tutorial:
typedef boost::make_recursive_variant<
int
, std::vector< boost::recursive_variant_ >
>::type int_tree_t;
std::vector< int_tree_t > subresult;
subresult.push_back(3);
subresult.push_back(5);
std::vector< int_tree_t > result;
result.push_back(1);
result.push_back(subresult);
result.push_back(7);
int_tree_t var(result);
And it works as expected.