#ifndef ENV_H
#define ENV_H

// #include "value.h"
typedef struct value * _value_t;

typedef struct env * env_t;
#define ENV_EMPTY NULL

typedef void (*env_destroy_func)(char *key, _value_t value);

env_t env_create(env_t parent, env_destroy_func destroy_func);
void env_destroy(env_t env);

int env_insert(env_t env, char *key, _value_t data,
                     char **prevkey, _value_t *prevdata);
int env_query(env_t env, char *key, _value_t *data);

env_t env_copy(env_t env);
env_t env_parent(env_t env);

#endif