fx: implement updated interfaces in builtin classes

fx/test/unicode-strings.c

@@ -17,8 +17,10 @@ int main(void)
 	size_t nr_delims = sizeof delims / sizeof delims[0];
 
 	fx_iterator *it = fx_string_tokenise(str, delims, nr_delims, 0);
-	fx_foreach(const char *, tok, it)
+	fx_foreach(val, it)
 	{
+		const char *tok = NULL;
+		fx_value_get_cstr(&val, &tok);
 		printf("%s\n", tok);
 	}
 	fx_iterator_unref(it);

fx/test/values.c

@@ -1,10 +1,27 @@
 #include <fx/value-type.h>
 #include <fx/value.h>
+#include <inttypes.h>
 #include <stdio.h>
 
 int main(void)
 {
-	fx_value v = FX_I32(1024);
-	printf("%u\n", __fx_type_get_value_type(FX_TYPE_I64));
+	fx_value x = FX_I32(1024);
+	fx_value y = FX_I16(512);
+	fx_value z = FX_VALUE_EMPTY;
+
+	fx_type_id common_type = fx_value_get_common_type(&x, &y);
+	fx_value_change_type(&x, &x, common_type);
+	fx_value_change_type(&y, &y, common_type);
+
+	fx_status status = fx_value_add(&x, &y, &z);
+	if (!FX_OK(status)) {
+		printf("add failed\n");
+		return -1;
+	}
+
+	u64 result = 0;
+	fx_value_get_u64(&z, &result);
+	printf("result: %" PRIu64 "\n", result);
+
 	return 0;
 }