Indicates that the fall through from the previous case label is intentional and should not be diagnosed by a compiler that warns on fallthrough.
[[fallthrough]] |
May only be applied to a null statement to create a fallthrough statement ([[fallthrough]];
). A fallthrough statement may only be used in a switch statement, where the next statement to be executed is a statement with a case or default label for that switch statement. Indicates that the fall through from the previous case label is intentional and should not be diagnosed by a compiler that warns on fallthrough.
void f(int n) { void g(), h(), i(); switch (n) { case 1: case 2: g(); [[fallthrough]]; case 3: // no warning on fallthrough h(); case 4: // compiler may warn on fallthrough if(n < 3) { i(); [[fallthrough]]; // OK } else { return; } case 5: [[fallthrough]]; // ill-formed, no subsequent case or default label } }
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