| use core::convert::TryFrom; |
| use core::num::{ |
| IntErrorKind, NonZeroI128, NonZeroI16, NonZeroI32, NonZeroI64, NonZeroI8, NonZeroIsize, |
| NonZeroU128, NonZeroU16, NonZeroU32, NonZeroU64, NonZeroU8, NonZeroUsize, |
| }; |
| use core::option::Option::{self, None, Some}; |
| use std::mem::size_of; |
| |
| #[test] |
| fn test_create_nonzero_instance() { |
| let _a = unsafe { NonZeroU32::new_unchecked(21) }; |
| } |
| |
| #[test] |
| fn test_size_nonzero_in_option() { |
| assert_eq!(size_of::<NonZeroU32>(), size_of::<Option<NonZeroU32>>()); |
| assert_eq!(size_of::<NonZeroI32>(), size_of::<Option<NonZeroI32>>()); |
| } |
| |
| #[test] |
| fn test_match_on_nonzero_option() { |
| let a = Some(unsafe { NonZeroU32::new_unchecked(42) }); |
| match a { |
| Some(val) => assert_eq!(val.get(), 42), |
| None => panic!("unexpected None while matching on Some(NonZeroU32(_))"), |
| } |
| |
| match unsafe { Some(NonZeroU32::new_unchecked(43)) } { |
| Some(val) => assert_eq!(val.get(), 43), |
| None => panic!("unexpected None while matching on Some(NonZeroU32(_))"), |
| } |
| } |
| |
| #[test] |
| fn test_match_option_empty_vec() { |
| let a: Option<Vec<isize>> = Some(vec![]); |
| match a { |
| None => panic!("unexpected None while matching on Some(vec![])"), |
| _ => {} |
| } |
| } |
| |
| #[test] |
| fn test_match_option_vec() { |
| let a = Some(vec![1, 2, 3, 4]); |
| match a { |
| Some(v) => assert_eq!(v, [1, 2, 3, 4]), |
| None => panic!("unexpected None while matching on Some(vec![1, 2, 3, 4])"), |
| } |
| } |
| |
| #[test] |
| fn test_match_option_rc() { |
| use std::rc::Rc; |
| |
| let five = Rc::new(5); |
| match Some(five) { |
| Some(r) => assert_eq!(*r, 5), |
| None => panic!("unexpected None while matching on Some(Rc::new(5))"), |
| } |
| } |
| |
| #[test] |
| fn test_match_option_arc() { |
| use std::sync::Arc; |
| |
| let five = Arc::new(5); |
| match Some(five) { |
| Some(a) => assert_eq!(*a, 5), |
| None => panic!("unexpected None while matching on Some(Arc::new(5))"), |
| } |
| } |
| |
| #[test] |
| fn test_match_option_empty_string() { |
| let a = Some(String::new()); |
| match a { |
| None => panic!("unexpected None while matching on Some(String::new())"), |
| _ => {} |
| } |
| } |
| |
| #[test] |
| fn test_match_option_string() { |
| let five = "Five".to_string(); |
| match Some(five) { |
| Some(s) => assert_eq!(s, "Five"), |
| None => panic!("{}", "unexpected None while matching on Some(String { ... })"), |
| } |
| } |
| |
| mod atom { |
| use core::num::NonZeroU32; |
| |
| #[derive(PartialEq, Eq)] |
| pub struct Atom { |
| index: NonZeroU32, // private |
| } |
| pub const FOO_ATOM: Atom = Atom { index: unsafe { NonZeroU32::new_unchecked(7) } }; |
| } |
| |
| macro_rules! atom { |
| ("foo") => { |
| atom::FOO_ATOM |
| }; |
| } |
| |
| #[test] |
| fn test_match_nonzero_const_pattern() { |
| match atom!("foo") { |
| // Using as a pattern is supported by the compiler: |
| atom!("foo") => {} |
| _ => panic!("Expected the const item as a pattern to match."), |
| } |
| } |
| |
| #[test] |
| fn test_from_nonzero() { |
| let nz = NonZeroU32::new(1).unwrap(); |
| let num: u32 = nz.into(); |
| assert_eq!(num, 1u32); |
| } |
| |
| #[test] |
| fn test_from_signed_nonzero() { |
| let nz = NonZeroI32::new(1).unwrap(); |
| let num: i32 = nz.into(); |
| assert_eq!(num, 1i32); |
| } |
| |
| #[test] |
| fn test_from_str() { |
| assert_eq!("123".parse::<NonZeroU8>(), Ok(NonZeroU8::new(123).unwrap())); |
| assert_eq!("0".parse::<NonZeroU8>().err().map(|e| e.kind().clone()), Some(IntErrorKind::Zero)); |
| assert_eq!( |
| "-1".parse::<NonZeroU8>().err().map(|e| e.kind().clone()), |
| Some(IntErrorKind::InvalidDigit) |
| ); |
| assert_eq!( |
| "-129".parse::<NonZeroI8>().err().map(|e| e.kind().clone()), |
| Some(IntErrorKind::NegOverflow) |
| ); |
| assert_eq!( |
| "257".parse::<NonZeroU8>().err().map(|e| e.kind().clone()), |
| Some(IntErrorKind::PosOverflow) |
| ); |
| } |
| |
| #[test] |
| fn test_nonzero_bitor() { |
| let nz_alt = NonZeroU8::new(0b1010_1010).unwrap(); |
| let nz_low = NonZeroU8::new(0b0000_1111).unwrap(); |
| |
| let both_nz: NonZeroU8 = nz_alt | nz_low; |
| assert_eq!(both_nz.get(), 0b1010_1111); |
| |
| let rhs_int: NonZeroU8 = nz_low | 0b1100_0000u8; |
| assert_eq!(rhs_int.get(), 0b1100_1111); |
| |
| let rhs_zero: NonZeroU8 = nz_alt | 0u8; |
| assert_eq!(rhs_zero.get(), 0b1010_1010); |
| |
| let lhs_int: NonZeroU8 = 0b0110_0110u8 | nz_alt; |
| assert_eq!(lhs_int.get(), 0b1110_1110); |
| |
| let lhs_zero: NonZeroU8 = 0u8 | nz_low; |
| assert_eq!(lhs_zero.get(), 0b0000_1111); |
| } |
| |
| #[test] |
| fn test_nonzero_bitor_assign() { |
| let mut target = NonZeroU8::new(0b1010_1010).unwrap(); |
| |
| target |= NonZeroU8::new(0b0000_1111).unwrap(); |
| assert_eq!(target.get(), 0b1010_1111); |
| |
| target |= 0b0001_0000; |
| assert_eq!(target.get(), 0b1011_1111); |
| |
| target |= 0; |
| assert_eq!(target.get(), 0b1011_1111); |
| } |
| |
| #[test] |
| fn test_nonzero_from_int_on_success() { |
| assert_eq!(NonZeroU8::try_from(5), Ok(NonZeroU8::new(5).unwrap())); |
| assert_eq!(NonZeroU32::try_from(5), Ok(NonZeroU32::new(5).unwrap())); |
| |
| assert_eq!(NonZeroI8::try_from(-5), Ok(NonZeroI8::new(-5).unwrap())); |
| assert_eq!(NonZeroI32::try_from(-5), Ok(NonZeroI32::new(-5).unwrap())); |
| } |
| |
| #[test] |
| fn test_nonzero_from_int_on_err() { |
| assert!(NonZeroU8::try_from(0).is_err()); |
| assert!(NonZeroU32::try_from(0).is_err()); |
| |
| assert!(NonZeroI8::try_from(0).is_err()); |
| assert!(NonZeroI32::try_from(0).is_err()); |
| } |
| |
| #[test] |
| fn nonzero_const() { |
| // test that the methods of `NonZeroX>` are usable in a const context |
| // Note: only tests NonZero8 |
| |
| const NONZERO_U8: NonZeroU8 = unsafe { NonZeroU8::new_unchecked(5) }; |
| |
| const GET: u8 = NONZERO_U8.get(); |
| assert_eq!(GET, 5); |
| |
| const ZERO: Option<NonZeroU8> = NonZeroU8::new(0); |
| assert!(ZERO.is_none()); |
| |
| const ONE: Option<NonZeroU8> = NonZeroU8::new(1); |
| assert!(ONE.is_some()); |
| |
| const FROM_NONZERO_U8: u8 = u8::from(NONZERO_U8); |
| assert_eq!(FROM_NONZERO_U8, 5); |
| |
| const NONZERO_CONVERT: NonZeroU32 = NonZeroU32::from(NONZERO_U8); |
| assert_eq!(NONZERO_CONVERT.get(), 5); |
| } |
| |
| #[test] |
| fn nonzero_leading_zeros() { |
| assert_eq!(NonZeroU8::new(1).unwrap().leading_zeros(), 7); |
| assert_eq!(NonZeroI8::new(1).unwrap().leading_zeros(), 7); |
| assert_eq!(NonZeroU16::new(1).unwrap().leading_zeros(), 15); |
| assert_eq!(NonZeroI16::new(1).unwrap().leading_zeros(), 15); |
| assert_eq!(NonZeroU32::new(1).unwrap().leading_zeros(), 31); |
| assert_eq!(NonZeroI32::new(1).unwrap().leading_zeros(), 31); |
| assert_eq!(NonZeroU64::new(1).unwrap().leading_zeros(), 63); |
| assert_eq!(NonZeroI64::new(1).unwrap().leading_zeros(), 63); |
| assert_eq!(NonZeroU128::new(1).unwrap().leading_zeros(), 127); |
| assert_eq!(NonZeroI128::new(1).unwrap().leading_zeros(), 127); |
| assert_eq!(NonZeroUsize::new(1).unwrap().leading_zeros(), usize::BITS - 1); |
| assert_eq!(NonZeroIsize::new(1).unwrap().leading_zeros(), usize::BITS - 1); |
| |
| assert_eq!(NonZeroU8::new(u8::MAX >> 2).unwrap().leading_zeros(), 2); |
| assert_eq!(NonZeroI8::new((u8::MAX >> 2) as i8).unwrap().leading_zeros(), 2); |
| assert_eq!(NonZeroU16::new(u16::MAX >> 2).unwrap().leading_zeros(), 2); |
| assert_eq!(NonZeroI16::new((u16::MAX >> 2) as i16).unwrap().leading_zeros(), 2); |
| assert_eq!(NonZeroU32::new(u32::MAX >> 2).unwrap().leading_zeros(), 2); |
| assert_eq!(NonZeroI32::new((u32::MAX >> 2) as i32).unwrap().leading_zeros(), 2); |
| assert_eq!(NonZeroU64::new(u64::MAX >> 2).unwrap().leading_zeros(), 2); |
| assert_eq!(NonZeroI64::new((u64::MAX >> 2) as i64).unwrap().leading_zeros(), 2); |
| assert_eq!(NonZeroU128::new(u128::MAX >> 2).unwrap().leading_zeros(), 2); |
| assert_eq!(NonZeroI128::new((u128::MAX >> 2) as i128).unwrap().leading_zeros(), 2); |
| assert_eq!(NonZeroUsize::new(usize::MAX >> 2).unwrap().leading_zeros(), 2); |
| assert_eq!(NonZeroIsize::new((usize::MAX >> 2) as isize).unwrap().leading_zeros(), 2); |
| |
| assert_eq!(NonZeroU8::new(u8::MAX).unwrap().leading_zeros(), 0); |
| assert_eq!(NonZeroI8::new(-1i8).unwrap().leading_zeros(), 0); |
| assert_eq!(NonZeroU16::new(u16::MAX).unwrap().leading_zeros(), 0); |
| assert_eq!(NonZeroI16::new(-1i16).unwrap().leading_zeros(), 0); |
| assert_eq!(NonZeroU32::new(u32::MAX).unwrap().leading_zeros(), 0); |
| assert_eq!(NonZeroI32::new(-1i32).unwrap().leading_zeros(), 0); |
| assert_eq!(NonZeroU64::new(u64::MAX).unwrap().leading_zeros(), 0); |
| assert_eq!(NonZeroI64::new(-1i64).unwrap().leading_zeros(), 0); |
| assert_eq!(NonZeroU128::new(u128::MAX).unwrap().leading_zeros(), 0); |
| assert_eq!(NonZeroI128::new(-1i128).unwrap().leading_zeros(), 0); |
| assert_eq!(NonZeroUsize::new(usize::MAX).unwrap().leading_zeros(), 0); |
| assert_eq!(NonZeroIsize::new(-1isize).unwrap().leading_zeros(), 0); |
| |
| const LEADING_ZEROS: u32 = NonZeroU16::new(1).unwrap().leading_zeros(); |
| assert_eq!(LEADING_ZEROS, 15); |
| } |
| |
| #[test] |
| fn nonzero_trailing_zeros() { |
| assert_eq!(NonZeroU8::new(1).unwrap().trailing_zeros(), 0); |
| assert_eq!(NonZeroI8::new(1).unwrap().trailing_zeros(), 0); |
| assert_eq!(NonZeroU16::new(1).unwrap().trailing_zeros(), 0); |
| assert_eq!(NonZeroI16::new(1).unwrap().trailing_zeros(), 0); |
| assert_eq!(NonZeroU32::new(1).unwrap().trailing_zeros(), 0); |
| assert_eq!(NonZeroI32::new(1).unwrap().trailing_zeros(), 0); |
| assert_eq!(NonZeroU64::new(1).unwrap().trailing_zeros(), 0); |
| assert_eq!(NonZeroI64::new(1).unwrap().trailing_zeros(), 0); |
| assert_eq!(NonZeroU128::new(1).unwrap().trailing_zeros(), 0); |
| assert_eq!(NonZeroI128::new(1).unwrap().trailing_zeros(), 0); |
| assert_eq!(NonZeroUsize::new(1).unwrap().trailing_zeros(), 0); |
| assert_eq!(NonZeroIsize::new(1).unwrap().trailing_zeros(), 0); |
| |
| assert_eq!(NonZeroU8::new(1 << 2).unwrap().trailing_zeros(), 2); |
| assert_eq!(NonZeroI8::new(1 << 2).unwrap().trailing_zeros(), 2); |
| assert_eq!(NonZeroU16::new(1 << 2).unwrap().trailing_zeros(), 2); |
| assert_eq!(NonZeroI16::new(1 << 2).unwrap().trailing_zeros(), 2); |
| assert_eq!(NonZeroU32::new(1 << 2).unwrap().trailing_zeros(), 2); |
| assert_eq!(NonZeroI32::new(1 << 2).unwrap().trailing_zeros(), 2); |
| assert_eq!(NonZeroU64::new(1 << 2).unwrap().trailing_zeros(), 2); |
| assert_eq!(NonZeroI64::new(1 << 2).unwrap().trailing_zeros(), 2); |
| assert_eq!(NonZeroU128::new(1 << 2).unwrap().trailing_zeros(), 2); |
| assert_eq!(NonZeroI128::new(1 << 2).unwrap().trailing_zeros(), 2); |
| assert_eq!(NonZeroUsize::new(1 << 2).unwrap().trailing_zeros(), 2); |
| assert_eq!(NonZeroIsize::new(1 << 2).unwrap().trailing_zeros(), 2); |
| |
| assert_eq!(NonZeroU8::new(1 << 7).unwrap().trailing_zeros(), 7); |
| assert_eq!(NonZeroI8::new(1 << 7).unwrap().trailing_zeros(), 7); |
| assert_eq!(NonZeroU16::new(1 << 15).unwrap().trailing_zeros(), 15); |
| assert_eq!(NonZeroI16::new(1 << 15).unwrap().trailing_zeros(), 15); |
| assert_eq!(NonZeroU32::new(1 << 31).unwrap().trailing_zeros(), 31); |
| assert_eq!(NonZeroI32::new(1 << 31).unwrap().trailing_zeros(), 31); |
| assert_eq!(NonZeroU64::new(1 << 63).unwrap().trailing_zeros(), 63); |
| assert_eq!(NonZeroI64::new(1 << 63).unwrap().trailing_zeros(), 63); |
| assert_eq!(NonZeroU128::new(1 << 127).unwrap().trailing_zeros(), 127); |
| assert_eq!(NonZeroI128::new(1 << 127).unwrap().trailing_zeros(), 127); |
| |
| assert_eq!( |
| NonZeroUsize::new(1 << (usize::BITS - 1)).unwrap().trailing_zeros(), |
| usize::BITS - 1 |
| ); |
| assert_eq!( |
| NonZeroIsize::new(1 << (usize::BITS - 1)).unwrap().trailing_zeros(), |
| usize::BITS - 1 |
| ); |
| |
| const TRAILING_ZEROS: u32 = NonZeroU16::new(1 << 2).unwrap().trailing_zeros(); |
| assert_eq!(TRAILING_ZEROS, 2); |
| } |
| |
| #[test] |
| fn test_nonzero_uint_div() { |
| let nz = NonZeroU32::new(1).unwrap(); |
| |
| let x: u32 = 42u32 / nz; |
| assert_eq!(x, 42u32); |
| } |
| |
| #[test] |
| fn test_nonzero_uint_rem() { |
| let nz = NonZeroU32::new(10).unwrap(); |
| |
| let x: u32 = 42u32 % nz; |
| assert_eq!(x, 2u32); |
| } |