alloc_bignum alloc_bytevector alloc_string assign_complex_num assign_double bignum_value bn_cmp_type boolean boolean_desc boolean_f boolean_t bytevector c_opaque closure closure0 closure1 closureN complex_num_value cond_var cvar Cyc_EOF CYC_IO_BUF_LEN defprimitive defsymbol double_value forward function_type function_type_va inline_function_type integer_value list maclosure0 macro make_boolean make_c_opaque make_cell make_complex_num make_cvar make_double make_empty_bytevector make_empty_vector make_input_port make_list_1 make_list_2 make_list_3 make_list_4 make_pair make_port make_string make_string_noalloc make_string_with_len make_utf8_string make_utf8_string_noalloc make_utf8_string_with_len mclosure0 mclosure1 mmacro mutex object object_tag opaque_ptr pair prim prim_name primitive quote_void return_copy set_pair string_len string_num_cp string_str symbol symbol_desc tag_type type_of vector

#define type_of (   obj )    (((pair_type *) obj)->tag) Access an object's tag.