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use std::convert::From; use std::ops::Deref; #[derive(Debug, Copy, Clone, Eq, PartialEq, Ord, PartialOrd)] pub struct U5(u8); #[derive(Debug, Copy, Clone, Eq, PartialEq, Ord, PartialOrd)] pub struct U7(u8); #[derive(Debug, Copy, Clone, Eq, PartialEq, Ord, PartialOrd)] pub struct U14(u16); #[derive(Debug, Copy, Clone, Eq, PartialEq, Ord, PartialOrd)] pub struct Channel(u8); impl From<u8> for U7 { fn from(i: u8) -> U7 { debug_assert!(i & 0x80 == 0); U7(i & 0x7f) } } impl Deref for U7 { type Target = u8; #[inline] fn deref(&self) -> &u8 { &self.0 } } impl From<u8> for U5 { fn from(i: u8) -> U5 { debug_assert!(i & 0xe0 == 0); U5(i & 0x1f) } } impl Deref for U5 { type Target = u8; #[inline] fn deref(&self) -> &u8 { &self.0 } } impl From<u16> for U14 { fn from(i: u16) -> U14 { debug_assert!(i & 0xc000 == 0); U14(i & 0x3fff) } } impl From<(U7, U7)> for U14 { fn from(i: (U7, U7)) -> U14 { U14(*i.0 as u16 + ((*i.1 as u16) << 7)) } } impl From<U14> for (U7, U7) { fn from(i: U14) -> (U7, U7) { (i.lsb(), i.msb()) } } impl U14 { #[inline] pub fn lsb(&self) -> U7 { U7((self.0 & 0x7f) as u8) } #[inline] pub fn msb(&self) -> U7 { U7((self.0 >> 7) as u8) } } impl Deref for U14 { type Target = u16; #[inline] fn deref(&self) -> &u16 { &self.0 } } impl From<u8> for Channel { fn from(i: u8) -> Channel { debug_assert!(i & 0xf0 == 0); Channel(i & 0x0f) } } impl Deref for Channel { type Target = u8; #[inline] fn deref(&self) -> &u8 { &self.0 } } #[test] #[should_panic] fn out_of_range() { let _: U7 = 129.into(); } #[test] fn test_u14() { let a = U7(0x40); let b = U7(0x30); let c: U14 = (b, a).into(); assert_eq!(c.msb(), a); assert_eq!(c.lsb(), b); assert_eq!(*c, 0x2030); }