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#ifndef GFCC_TREE_H
#define GFCC_TREE_H
typedef enum {
ATOM_STRING,
ATOM_INTEGER,
ATOM_DOUBLE,
ATOM_META,
ATOM_FIRST_FUN
} atom_type;
struct Tree_{
atom_type type;
union {
const char *string_value;
int integer_value;
double double_value;
int size;
} value;
struct Tree_ *args[0];
};
typedef struct Tree_ Tree;
static inline Tree *tree_get_child(Tree *t, int n) {
return t->args[n];
}
static inline void tree_set_child(Tree *t, int n, Tree *a) {
t->args[n] = a;
}
extern int arity(Tree *t);
extern Tree *tree_string(const char *s);
extern Tree *tree_integer(int i);
extern Tree *tree_double(double d);
extern Tree *tree_meta();
extern Tree *tree_fun(atom_type f, int n);
extern void tree_free(Tree *t);
#endif
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