There is a custom iterator derived from boost::iterator_facade
.
#include <boost/iterator/iterator_facade.hpp>
class JsonIter : public boost::iterator_facade
<JsonIter, Json::ValueIterator, boost::forward_traversal_tag, Json::Value &>
{
public:
JsonIter() {}
explicit JsonIter(Json::ValueIterator iter) : m_iter(iter) {}
private:
friend class boost::iterator_core_access;
void increment() { ++m_iter; }
bool equal(const JsonIter &other) const {return this->m_iter == other.m_iter;}
Json::Value &dereference() const { return *m_iter; }
Json::ValueIterator m_iter;
};
And client code is following:
std::copy(JsonIter(root.begin()), JsonIter(root.end()), std::back_inserter(vec));