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An Elixir DuckDB library

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duckdbex c_src map_iterator.h
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c_src/map_iterator.h 

#pragma once

#include <erl_nif.h>



/*

A map iterator is only useful during the lifetime of environment env that the map belongs to

*/

namespace nif {

  struct ErlangMapIterator {

    ErlangMapIterator(ErlNifEnv* map_env, ERL_NIF_TERM map):

      valid(false),

      env(map_env) {

      valid = enif_map_iterator_create(env, map, &iterator, ERL_NIF_MAP_ITERATOR_FIRST);

    }



    virtual ~ErlangMapIterator() {

      enif_map_iterator_destroy(env, &iterator);

      env = 0;

      valid = false;

    }



    bool next() {

      bool pair_valid = enif_map_iterator_get_pair(env, &iterator, &key, &value);

      enif_map_iterator_next(env, &iterator);

      return pair_valid;

    }



    ErlNifEnv* env;

    ErlNifMapIterator iterator;

    bool valid;

    ERL_NIF_TERM key;

    ERL_NIF_TERM value;

  };

}