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pub trait IsOdd { fn is_odd(&self) -> bool; } impl IsOdd for i8 { fn is_odd(&self) -> bool { self&1 != 0 } } impl IsOdd for u8 { fn is_odd(&self) -> bool { self&1 != 0 } } impl IsOdd for i16 { fn is_odd(&self) -> bool { self&1 != 0 } } impl IsOdd for u16 { fn is_odd(&self) -> bool { self&1 != 0 } } impl IsOdd for i32 { fn is_odd(&self) -> bool { self&1 != 0 } } impl IsOdd for u32 { fn is_odd(&self) -> bool { self&1 != 0 } } impl IsOdd for i64 { fn is_odd(&self) -> bool { self&1 != 0 } } impl IsOdd for u64 { fn is_odd(&self) -> bool { self&1 != 0 } }