The attribute-token fallthrough may be applied to a null statement; such a statement is a fallthrough statement. The attribute-token fallthrough shall appear at most once in each attribute-list and no attribute-argument-clause shall be present. A fallthrough statement may only appear within an enclosing switch statement. The next statement that would be executed after a fallthrough statement shall be a labeled statement whose label is a case label or default label for the same switch statement. The program is ill-formed if there is no such statement.
[ Note: The use of a fallthrough statement is intended to suppress a warning that an implementation might otherwise issue for a case or default label that is reachable from another case or default label along some path of execution. Implementations are encouraged to issue a warning if a fallthrough statement is not dynamically reachable. — end note ]
[ Example:
void f(int n) {
void g(), h(), i();
switch (n) {
case 1:
case 2:
g();
[[fallthrough]];
case 3: h();
case 4: i();
[[fallthrough]]; }
}
— end example ]
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