Indicates that the fall through from the previous case label is intentional and should not be diagnosed by a compiler that warns on fallthrough.

[edit]Syntax

[edit]Explanation

May only be applied to anull statement to create afallthrough statement ([[fallthrough]];).

A fallthrough statement may only be used in aswitch statement, where the next statement to be executed is a statement with a case or default label for that switch statement. If the fallthrough statement is inside a loop, the next (labeled) statement must be part of the same iteration of that loop.

[edit]Example

void f(int n){void g(), h(), i(); switch(n){case1:case2:            g();[[fallthrough]];case3:// no warning on fallthrough            h();case4:// compiler may warn on fallthroughif(n<3){                i();[[fallthrough]];// OK}else{return;}case5:while(false){[[fallthrough]];// ill-formed: next statement is not//             part of the same iteration}case6:[[fallthrough]];// ill-formed, no subsequent case or default label}}

[edit]Defect reports

The following behavior-changing defect reports were applied retroactively to previously published C++ standards.

[edit]References

[edit]See also

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