#ifndef SUB_H_
#define SUB_H_

#include "config.h"

#include <stddef.h>

struct expr;
struct sub;

struct sub *sub_new(const struct expr *);
struct sub *sub_incr(struct sub *);
void sub_decr(struct sub *);
ATTR_PURE
struct expr *sub_expr(const struct sub *);
size_t sub_id(const struct sub *);

#endif /* SUB_H_ */