* wrapped optional types. It is meant to be used with PODs.
*/
#define LTTNG_OPTIONAL_GET(optional) \
- ({ \
+ ({ \
assert((optional).is_set); \
(optional).value; \
})
/*
- * Initialize an optional field.
+ * This macro is available as a 'convenience' to allow sites that assume
+ * an optional value is set to assert() that it is set when fecthing the
+ * underlying value's address.
+ */
+#define LTTNG_OPTIONAL_GET_PTR(optional) \
+ ({ \
+ assert((optional).is_set); \
+ &(optional).value; \
+ })
+
+/*
+ * Initialize an optional field as unset.
*
* The wrapped field is set to the value it would gave if it had static storage
* duration.
*/
-#define LTTNG_OPTIONAL_INIT { .is_set = 0 }
+#define LTTNG_OPTIONAL_INIT_UNSET { .is_set = 0 }
+
+/*
+ * Initialize an optional field as 'set' with a given value.
+ */
+#define LTTNG_OPTIONAL_INIT_VALUE(val) { .value = val, .is_set = 1 }
/* Set the value of an optional field. */
#define LTTNG_OPTIONAL_SET(field_ptr, val) \