398 lines
12 KiB
Rust
398 lines
12 KiB
Rust
//! Tests of `num_traits::cast`.
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#![no_std]
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#[cfg(feature = "std")]
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#[macro_use]
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extern crate std;
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extern crate num_traits;
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use num_traits::cast::*;
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use num_traits::Bounded;
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use core::{f32, f64};
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#[cfg(has_i128)]
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use core::{i128, u128};
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use core::{i16, i32, i64, i8, isize};
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use core::{u16, u32, u64, u8, usize};
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use core::fmt::Debug;
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use core::mem;
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use core::num::Wrapping;
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#[test]
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fn to_primitive_float() {
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let f32_toolarge = 1e39f64;
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assert_eq!(f32_toolarge.to_f32(), Some(f32::INFINITY));
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assert_eq!((-f32_toolarge).to_f32(), Some(f32::NEG_INFINITY));
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assert_eq!((f32::MAX as f64).to_f32(), Some(f32::MAX));
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assert_eq!((-f32::MAX as f64).to_f32(), Some(-f32::MAX));
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assert_eq!(f64::INFINITY.to_f32(), Some(f32::INFINITY));
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assert_eq!((f64::NEG_INFINITY).to_f32(), Some(f32::NEG_INFINITY));
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assert!((f64::NAN).to_f32().map_or(false, |f| f.is_nan()));
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}
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#[test]
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fn wrapping_to_primitive() {
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macro_rules! test_wrapping_to_primitive {
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($($t:ty)+) => {
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$({
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let i: $t = 0;
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let w = Wrapping(i);
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assert_eq!(i.to_u8(), w.to_u8());
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assert_eq!(i.to_u16(), w.to_u16());
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assert_eq!(i.to_u32(), w.to_u32());
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assert_eq!(i.to_u64(), w.to_u64());
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assert_eq!(i.to_usize(), w.to_usize());
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assert_eq!(i.to_i8(), w.to_i8());
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assert_eq!(i.to_i16(), w.to_i16());
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assert_eq!(i.to_i32(), w.to_i32());
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assert_eq!(i.to_i64(), w.to_i64());
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assert_eq!(i.to_isize(), w.to_isize());
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assert_eq!(i.to_f32(), w.to_f32());
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assert_eq!(i.to_f64(), w.to_f64());
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})+
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};
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}
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test_wrapping_to_primitive!(usize u8 u16 u32 u64 isize i8 i16 i32 i64);
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}
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#[test]
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fn wrapping_is_toprimitive() {
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fn require_toprimitive<T: ToPrimitive>(_: &T) {}
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require_toprimitive(&Wrapping(42));
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}
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#[test]
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fn wrapping_is_fromprimitive() {
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fn require_fromprimitive<T: FromPrimitive>(_: &T) {}
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require_fromprimitive(&Wrapping(42));
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}
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#[test]
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fn wrapping_is_numcast() {
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fn require_numcast<T: NumCast>(_: &T) {}
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require_numcast(&Wrapping(42));
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}
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#[test]
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fn as_primitive() {
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let x: f32 = (1.625f64).as_();
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assert_eq!(x, 1.625f32);
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let x: f32 = (3.14159265358979323846f64).as_();
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assert_eq!(x, 3.1415927f32);
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let x: u8 = (768i16).as_();
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assert_eq!(x, 0);
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}
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#[test]
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fn float_to_integer_checks_overflow() {
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// This will overflow an i32
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let source: f64 = 1.0e+123f64;
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// Expect the overflow to be caught
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assert_eq!(cast::<f64, i32>(source), None);
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}
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#[test]
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fn cast_to_int_checks_overflow() {
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let big_f: f64 = 1.0e123;
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let normal_f: f64 = 1.0;
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let small_f: f64 = -1.0e123;
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assert_eq!(None, cast::<f64, isize>(big_f));
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assert_eq!(None, cast::<f64, i8>(big_f));
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assert_eq!(None, cast::<f64, i16>(big_f));
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assert_eq!(None, cast::<f64, i32>(big_f));
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assert_eq!(None, cast::<f64, i64>(big_f));
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assert_eq!(Some(normal_f as isize), cast::<f64, isize>(normal_f));
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assert_eq!(Some(normal_f as i8), cast::<f64, i8>(normal_f));
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assert_eq!(Some(normal_f as i16), cast::<f64, i16>(normal_f));
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assert_eq!(Some(normal_f as i32), cast::<f64, i32>(normal_f));
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assert_eq!(Some(normal_f as i64), cast::<f64, i64>(normal_f));
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assert_eq!(None, cast::<f64, isize>(small_f));
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assert_eq!(None, cast::<f64, i8>(small_f));
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assert_eq!(None, cast::<f64, i16>(small_f));
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assert_eq!(None, cast::<f64, i32>(small_f));
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assert_eq!(None, cast::<f64, i64>(small_f));
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}
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#[test]
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fn cast_to_unsigned_int_checks_overflow() {
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let big_f: f64 = 1.0e123;
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let normal_f: f64 = 1.0;
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let small_f: f64 = -1.0e123;
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assert_eq!(None, cast::<f64, usize>(big_f));
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assert_eq!(None, cast::<f64, u8>(big_f));
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assert_eq!(None, cast::<f64, u16>(big_f));
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assert_eq!(None, cast::<f64, u32>(big_f));
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assert_eq!(None, cast::<f64, u64>(big_f));
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assert_eq!(Some(normal_f as usize), cast::<f64, usize>(normal_f));
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assert_eq!(Some(normal_f as u8), cast::<f64, u8>(normal_f));
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assert_eq!(Some(normal_f as u16), cast::<f64, u16>(normal_f));
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assert_eq!(Some(normal_f as u32), cast::<f64, u32>(normal_f));
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assert_eq!(Some(normal_f as u64), cast::<f64, u64>(normal_f));
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assert_eq!(None, cast::<f64, usize>(small_f));
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assert_eq!(None, cast::<f64, u8>(small_f));
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assert_eq!(None, cast::<f64, u16>(small_f));
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assert_eq!(None, cast::<f64, u32>(small_f));
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assert_eq!(None, cast::<f64, u64>(small_f));
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}
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#[test]
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#[cfg(has_i128)]
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fn cast_to_i128_checks_overflow() {
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let big_f: f64 = 1.0e123;
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let normal_f: f64 = 1.0;
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let small_f: f64 = -1.0e123;
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assert_eq!(None, cast::<f64, i128>(big_f));
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assert_eq!(None, cast::<f64, u128>(big_f));
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assert_eq!(Some(normal_f as i128), cast::<f64, i128>(normal_f));
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assert_eq!(Some(normal_f as u128), cast::<f64, u128>(normal_f));
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assert_eq!(None, cast::<f64, i128>(small_f));
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assert_eq!(None, cast::<f64, u128>(small_f));
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}
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#[cfg(feature = "std")]
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fn dbg(args: ::core::fmt::Arguments) {
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println!("{}", args);
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}
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#[cfg(not(feature = "std"))]
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fn dbg(_: ::core::fmt::Arguments) {}
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// Rust 1.8 doesn't handle cfg on macros correctly
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macro_rules! dbg { ($($tok:tt)*) => { dbg(format_args!($($tok)*)) } }
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macro_rules! float_test_edge {
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($f:ident -> $($t:ident)+) => { $({
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dbg!("testing cast edge cases for {} -> {}", stringify!($f), stringify!($t));
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let small = if $t::MIN == 0 || mem::size_of::<$t>() < mem::size_of::<$f>() {
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$t::MIN as $f - 1.0
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} else {
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($t::MIN as $f).raw_offset(1).floor()
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};
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let fmin = small.raw_offset(-1);
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dbg!(" testing min {}\n\tvs. {:.0}\n\tand {:.0}", $t::MIN, fmin, small);
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assert_eq!(Some($t::MIN), cast::<$f, $t>($t::MIN as $f));
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assert_eq!(Some($t::MIN), cast::<$f, $t>(fmin));
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assert_eq!(None, cast::<$f, $t>(small));
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let (max, large) = if mem::size_of::<$t>() < mem::size_of::<$f>() {
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($t::MAX, $t::MAX as $f + 1.0)
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} else {
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let large = $t::MAX as $f; // rounds up!
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let max = large.raw_offset(-1) as $t; // the next smallest possible
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assert_eq!(max.count_ones(), $f::MANTISSA_DIGITS);
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(max, large)
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};
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let fmax = large.raw_offset(-1);
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dbg!(" testing max {}\n\tvs. {:.0}\n\tand {:.0}", max, fmax, large);
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assert_eq!(Some(max), cast::<$f, $t>(max as $f));
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assert_eq!(Some(max), cast::<$f, $t>(fmax));
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assert_eq!(None, cast::<$f, $t>(large));
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dbg!(" testing non-finite values");
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assert_eq!(None, cast::<$f, $t>($f::NAN));
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assert_eq!(None, cast::<$f, $t>($f::INFINITY));
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assert_eq!(None, cast::<$f, $t>($f::NEG_INFINITY));
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})+}
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}
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trait RawOffset: Sized {
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type Raw;
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fn raw_offset(self, offset: Self::Raw) -> Self;
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}
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impl RawOffset for f32 {
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type Raw = i32;
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fn raw_offset(self, offset: Self::Raw) -> Self {
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unsafe {
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let raw: Self::Raw = mem::transmute(self);
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mem::transmute(raw + offset)
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}
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}
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}
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impl RawOffset for f64 {
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type Raw = i64;
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fn raw_offset(self, offset: Self::Raw) -> Self {
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unsafe {
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let raw: Self::Raw = mem::transmute(self);
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mem::transmute(raw + offset)
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}
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}
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}
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#[test]
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fn cast_float_to_int_edge_cases() {
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float_test_edge!(f32 -> isize i8 i16 i32 i64);
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float_test_edge!(f32 -> usize u8 u16 u32 u64);
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float_test_edge!(f64 -> isize i8 i16 i32 i64);
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float_test_edge!(f64 -> usize u8 u16 u32 u64);
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}
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#[test]
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#[cfg(has_i128)]
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fn cast_float_to_i128_edge_cases() {
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float_test_edge!(f32 -> i128 u128);
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float_test_edge!(f64 -> i128 u128);
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}
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macro_rules! int_test_edge {
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($f:ident -> { $($t:ident)+ } with $BigS:ident $BigU:ident ) => { $({
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fn test_edge() {
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dbg!("testing cast edge cases for {} -> {}", stringify!($f), stringify!($t));
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match ($f::MIN as $BigS).cmp(&($t::MIN as $BigS)) {
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Greater => {
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assert_eq!(Some($f::MIN as $t), cast::<$f, $t>($f::MIN));
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}
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Equal => {
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assert_eq!(Some($t::MIN), cast::<$f, $t>($f::MIN));
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}
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Less => {
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let min = $t::MIN as $f;
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assert_eq!(Some($t::MIN), cast::<$f, $t>(min));
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assert_eq!(None, cast::<$f, $t>(min - 1));
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}
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}
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match ($f::MAX as $BigU).cmp(&($t::MAX as $BigU)) {
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Greater => {
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let max = $t::MAX as $f;
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assert_eq!(Some($t::MAX), cast::<$f, $t>(max));
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assert_eq!(None, cast::<$f, $t>(max + 1));
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}
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Equal => {
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assert_eq!(Some($t::MAX), cast::<$f, $t>($f::MAX));
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}
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Less => {
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assert_eq!(Some($f::MAX as $t), cast::<$f, $t>($f::MAX));
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}
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}
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}
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test_edge();
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})+}
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}
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#[test]
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fn cast_int_to_int_edge_cases() {
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use core::cmp::Ordering::*;
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macro_rules! test_edge {
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($( $from:ident )+) => { $({
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int_test_edge!($from -> { isize i8 i16 i32 i64 } with i64 u64);
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int_test_edge!($from -> { usize u8 u16 u32 u64 } with i64 u64);
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})+}
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}
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test_edge!(isize i8 i16 i32 i64);
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test_edge!(usize u8 u16 u32 u64);
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}
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#[test]
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#[cfg(has_i128)]
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fn cast_int_to_128_edge_cases() {
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use core::cmp::Ordering::*;
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macro_rules! test_edge {
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($( $t:ident )+) => {
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$(
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int_test_edge!($t -> { i128 u128 } with i128 u128);
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)+
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int_test_edge!(i128 -> { $( $t )+ } with i128 u128);
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int_test_edge!(u128 -> { $( $t )+ } with i128 u128);
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}
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}
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test_edge!(isize i8 i16 i32 i64 i128);
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test_edge!(usize u8 u16 u32 u64 u128);
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}
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#[test]
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fn newtype_from_primitive() {
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#[derive(PartialEq, Debug)]
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struct New<T>(T);
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// minimal impl
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impl<T: FromPrimitive> FromPrimitive for New<T> {
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fn from_i64(n: i64) -> Option<Self> {
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T::from_i64(n).map(New)
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}
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fn from_u64(n: u64) -> Option<Self> {
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T::from_u64(n).map(New)
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}
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}
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macro_rules! assert_eq_from {
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($( $from:ident )+) => {$(
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assert_eq!(T::$from(Bounded::min_value()).map(New),
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New::<T>::$from(Bounded::min_value()));
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assert_eq!(T::$from(Bounded::max_value()).map(New),
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New::<T>::$from(Bounded::max_value()));
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)+}
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}
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fn check<T: PartialEq + Debug + FromPrimitive>() {
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assert_eq_from!(from_i8 from_i16 from_i32 from_i64 from_isize);
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assert_eq_from!(from_u8 from_u16 from_u32 from_u64 from_usize);
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assert_eq_from!(from_f32 from_f64);
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}
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macro_rules! check {
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($( $ty:ty )+) => {$( check::<$ty>(); )+}
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}
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check!(i8 i16 i32 i64 isize);
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check!(u8 u16 u32 u64 usize);
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}
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#[test]
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fn newtype_to_primitive() {
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#[derive(PartialEq, Debug)]
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struct New<T>(T);
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// minimal impl
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impl<T: ToPrimitive> ToPrimitive for New<T> {
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fn to_i64(&self) -> Option<i64> {
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self.0.to_i64()
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}
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fn to_u64(&self) -> Option<u64> {
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self.0.to_u64()
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}
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}
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macro_rules! assert_eq_to {
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($( $to:ident )+) => {$(
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assert_eq!(T::$to(&Bounded::min_value()),
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New::<T>::$to(&New(Bounded::min_value())));
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assert_eq!(T::$to(&Bounded::max_value()),
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New::<T>::$to(&New(Bounded::max_value())));
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)+}
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}
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fn check<T: PartialEq + Debug + Bounded + ToPrimitive>() {
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assert_eq_to!(to_i8 to_i16 to_i32 to_i64 to_isize);
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assert_eq_to!(to_u8 to_u16 to_u32 to_u64 to_usize);
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assert_eq_to!(to_f32 to_f64);
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}
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macro_rules! check {
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($( $ty:ty )+) => {$( check::<$ty>(); )+}
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}
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check!(i8 i16 i32 i64 isize);
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check!(u8 u16 u32 u64 usize);
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}
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