@@ -574,7 +574,7 @@ class Option
574574 }
575575
576576 /* *
577- * @brief Returns true iff this is the first element of the linked list.
577+ * @brief Returns true if this is the first element of the linked list.
578578 *
579579 * The first element in the linked list is the first option on the command line
580580 * that has the respective Descriptor::index value.
@@ -587,7 +587,7 @@ class Option
587587 }
588588
589589 /* *
590- * @brief Returns true iff this is the last element of the linked list.
590+ * @brief Returns true if this is the last element of the linked list.
591591 *
592592 * The last element in the linked list is the last option on the command line
593593 * that has the respective Descriptor::index value.
@@ -1453,7 +1453,7 @@ class Parser
14531453 /* *
14541454 * @internal
14551455 * @brief This is the core function that does all the parsing.
1456- * @retval false iff an unrecoverable error occurred.
1456+ * @retval false if an unrecoverable error occurred.
14571457 */
14581458 static bool workhorse (
14591459 bool gnu,
@@ -1467,7 +1467,7 @@ class Parser
14671467
14681468 /* *
14691469 * @internal
1470- * @brief Returns true iff @c st1 is a prefix of @c st2 and
1470+ * @brief Returns true if @c st1 is a prefix of @c st2 and
14711471 * in case @c st2 is longer than @c st1, then
14721472 * the first additional character is '='.
14731473 *
@@ -1497,7 +1497,7 @@ class Parser
14971497 * @internal
14981498 * @brief Like streq() but handles abbreviations.
14991499 *
1500- * Returns true iff @c st1 and @c st2 have a common
1500+ * Returns true if @c st1 and @c st2 have a common
15011501 * prefix with the following properties:
15021502 * @li (if min > 0) its length is at least @c min characters or the same length as @c st1 (whichever is smaller).
15031503 * @li (if min <= 0) its length is the same as that of @c st1
@@ -1534,7 +1534,7 @@ class Parser
15341534
15351535 /* *
15361536 * @internal
1537- * @brief Returns true iff character @c ch is contained in the string @c st.
1537+ * @brief Returns true if character @c ch is contained in the string @c st.
15381538 *
15391539 * Returns @c true for @c ch==0 .
15401540 */
@@ -1581,7 +1581,7 @@ struct Parser::Action
15811581 * options if they have a Descriptor whose Descriptor::check_arg does not return
15821582 * @ref ARG_ILLEGAL.
15831583 *
1584- * Returns @c false iff a fatal error has occured and the parse should be aborted.
1584+ * Returns @c false if a fatal error has occured and the parse should be aborted.
15851585 */
15861586 virtual bool perform (
15871587 Option&)
@@ -1595,7 +1595,7 @@ struct Parser::Action
15951595 * @param args pointer to the first remaining non-option argument (if numargs > 0).
15961596 *
15971597 * @return
1598- * @c false iff a fatal error has occurred.
1598+ * @c false if a fatal error has occurred.
15991599 */
16001600 virtual bool finished (
16011601 int numargs,
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