#pragma once

#include <boost/variant/static_visitor.hpp>

#include "mstch/mstch.hpp"

namespace mstch
{

class is_node_empty : public boost::static_visitor<bool>
{
public:
  template <class T> bool operator()(const T &) const { return false; }

  bool operator()(const std::nullptr_t &) const { return true; }

  bool operator()(const int &value) const { return value == 0; }

  bool operator()(const double &value) const { return value == 0; }

  bool operator()(const bool &value) const { return !value; }

  bool operator()(const std::string &value) const { return value == ""; }

  bool operator()(const array &array) const { return array.size() == 0; }
};
}