[ Note: A nodiscard call is a function call expression that calls a function previously declared nodiscard, or whose return type is a possibly cv-qualified class or enumeration type marked nodiscard. Appearance of a nodiscard call as a potentially-evaluated discarded-value expression (Clause [expr]) is discouraged unless explicitly cast to void. Implementations are encouraged to issue a warning in such cases. This is typically because discarding the return value of a nodiscard call has surprising consequences. — end note ]
[ Example:
struct [[nodiscard]] error_info { /* ... */ };
error_info enable_missile_safety_mode();
void launch_missiles();
void test_missiles() {
enable_missile_safety_mode(); launch_missiles();
}
error_info &foo();
void f() { foo(); }
— end example ]
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