add typeOf() and instanceOf()

src/meson.build

@@ -2,6 +2,7 @@ pkg = import('pkgconfig')
 
 librtti_c_srcs=[
   'create.c',
+  'typeinfo.c',
   'lock.c',
   'iter.c',
   'ref.c',

src/typeinfo.c

@@ -0,0 +1,27 @@
+#include <errno.h>
+#include <stdlib.h>
+
+#include "rtti.h"
+
+typeinfo_t *typeOf(var v) {
+    meta_obj_t *obj = NULL;
+
+    obj = RTTI_DATA_TO_OBJ(v);
+    if (RTTI_OBJ_INVALID(obj)) {
+        return NULL;
+    }
+
+    return obj->type;
+}
+
+int instanceOf(var v, typeinfo_t *t) {
+    if ((v == NULL) || (t == NULL)) {
+        return -EINVAL;
+    }
+
+    if (typeOf(v) == t) {
+        return 1;
+    }
+
+    return 0;
+}