The attribute may be applied to the declaration of a class, a typedef-name, a variable, a non-static data member, a function, an enumeration, or an enumerator.
[ Note: For an entity marked maybe_unused, implementations are encouraged not to emit a warning that the entity is unused, or that the entity is used despite the presence of the attribute. — end note ]
A name or entity declared without the maybe_unused attribute can later be redeclared with the attribute and vice versa. An entity is considered marked after the first declaration that marks it.
[ Example:
[[maybe_unused]] void f([[maybe_unused]] bool thing1,
[[maybe_unused]] bool thing2) {
[[maybe_unused]] bool b = thing1 && thing2;
assert(b);
}
Implementations are encouraged not to warn that b is unused, whether or not NDEBUG is defined. — end example ]
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