oo.md

Object oriented programming

ANYSXP is used internal in S4 class definitions to flag that any SEXP is ok.

Rboolean (Rf_isObject)(SEXP s);

S3

Rboolean Rf_inherits(SEXP, const char *);
SEXP Rf_S3Class(SEXP);
int Rf_isBasicClass(const char *);
SEXP Rf_classgets(SEXP, SEXP);

S4 (S4SXP)

Rboolean Rf_isS4(SEXP);
SEXP Rf_asS4(SEXP, Rboolean, int);
SEXP Rf_allocS4Object(void);

/* S3-S4 class (inheritance), attrib.c */
SEXP R_S4_extends(SEXP klass, SEXP useTable);

/* class definition, new objects (objects.c) */
SEXP R_do_MAKE_CLASS(const char *what);
SEXP R_getClassDef  (const char *what);
SEXP R_getClassDef_R(SEXP what);
Rboolean R_has_methods_attached(void);
Rboolean R_isVirtualClass(SEXP class_def, SEXP env);
Rboolean R_extends  (SEXP class1, SEXP class2, SEXP env);
SEXP R_do_new_object(SEXP class_def);
/* supporting  a C-level version of  is(., .) : */
int R_check_class_and_super(SEXP x, const char **valid, SEXP rho);
int R_check_class_etc      (SEXP x, const char **valid);

Internals

int (IS_S4_OBJECT)(SEXP x);
void (SET_S4_OBJECT)(SEXP x);
void (UNSET_S4_OBJECT)(SEXP x);

Slots

SEXP R_do_slot(SEXP obj, SEXP name);
SEXP R_do_slot_assign(SEXP obj, SEXP name, SEXP value);
int R_has_slot(SEXP obj, SEXP name);