808 lines
26 KiB
Rust
808 lines
26 KiB
Rust
use core::{i8, i16, i32, i64, isize};
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use core::{u8, u16, u32, u64, usize};
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use core::{f32, f64};
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use core::mem::size_of;
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use core::num::Wrapping;
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use float::FloatCore;
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/// A generic trait for converting a value to a number.
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pub trait ToPrimitive {
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/// Converts the value of `self` to an `isize`.
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#[inline]
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fn to_isize(&self) -> Option<isize> {
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self.to_i64().and_then(|x| x.to_isize())
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}
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/// Converts the value of `self` to an `i8`.
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#[inline]
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fn to_i8(&self) -> Option<i8> {
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self.to_i64().and_then(|x| x.to_i8())
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}
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/// Converts the value of `self` to an `i16`.
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#[inline]
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fn to_i16(&self) -> Option<i16> {
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self.to_i64().and_then(|x| x.to_i16())
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}
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/// Converts the value of `self` to an `i32`.
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#[inline]
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fn to_i32(&self) -> Option<i32> {
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self.to_i64().and_then(|x| x.to_i32())
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}
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/// Converts the value of `self` to an `i64`.
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fn to_i64(&self) -> Option<i64>;
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/// Converts the value of `self` to a `usize`.
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#[inline]
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fn to_usize(&self) -> Option<usize> {
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self.to_u64().and_then(|x| x.to_usize())
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}
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/// Converts the value of `self` to an `u8`.
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#[inline]
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fn to_u8(&self) -> Option<u8> {
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self.to_u64().and_then(|x| x.to_u8())
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}
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/// Converts the value of `self` to an `u16`.
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#[inline]
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fn to_u16(&self) -> Option<u16> {
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self.to_u64().and_then(|x| x.to_u16())
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}
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/// Converts the value of `self` to an `u32`.
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#[inline]
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fn to_u32(&self) -> Option<u32> {
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self.to_u64().and_then(|x| x.to_u32())
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}
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/// Converts the value of `self` to an `u64`.
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#[inline]
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fn to_u64(&self) -> Option<u64>;
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/// Converts the value of `self` to an `f32`.
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#[inline]
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fn to_f32(&self) -> Option<f32> {
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self.to_f64().and_then(|x| x.to_f32())
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}
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/// Converts the value of `self` to an `f64`.
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#[inline]
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fn to_f64(&self) -> Option<f64> {
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self.to_i64().and_then(|x| x.to_f64())
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}
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}
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macro_rules! impl_to_primitive_int_to_int {
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($SrcT:ident : $( fn $method:ident -> $DstT:ident ; )*) => {$(
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#[inline]
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fn $method(&self) -> Option<$DstT> {
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let min = $DstT::MIN as $SrcT;
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let max = $DstT::MAX as $SrcT;
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if size_of::<$SrcT>() <= size_of::<$DstT>() || (min <= *self && *self <= max) {
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Some(*self as $DstT)
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} else {
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None
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}
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}
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)*}
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}
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macro_rules! impl_to_primitive_int_to_uint {
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($SrcT:ident : $( fn $method:ident -> $DstT:ident ; )*) => {$(
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#[inline]
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fn $method(&self) -> Option<$DstT> {
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let max = $DstT::MAX as u64;
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if 0 <= *self && (size_of::<$SrcT>() < size_of::<$DstT>() || *self as u64 <= max) {
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Some(*self as $DstT)
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} else {
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None
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}
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}
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)*}
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}
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macro_rules! impl_to_primitive_int {
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($T:ident) => (
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impl ToPrimitive for $T {
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impl_to_primitive_int_to_int! { $T:
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fn to_isize -> isize;
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fn to_i8 -> i8;
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fn to_i16 -> i16;
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fn to_i32 -> i32;
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fn to_i64 -> i64;
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}
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impl_to_primitive_int_to_uint! { $T:
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fn to_usize -> usize;
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fn to_u8 -> u8;
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fn to_u16 -> u16;
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fn to_u32 -> u32;
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fn to_u64 -> u64;
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}
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#[inline]
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fn to_f32(&self) -> Option<f32> { Some(*self as f32) }
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#[inline]
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fn to_f64(&self) -> Option<f64> { Some(*self as f64) }
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}
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)
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}
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impl_to_primitive_int!(isize);
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impl_to_primitive_int!(i8);
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impl_to_primitive_int!(i16);
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impl_to_primitive_int!(i32);
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impl_to_primitive_int!(i64);
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macro_rules! impl_to_primitive_uint_to_int {
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($SrcT:ident : $( fn $method:ident -> $DstT:ident ; )*) => {$(
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#[inline]
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fn $method(&self) -> Option<$DstT> {
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let max = $DstT::MAX as u64;
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if size_of::<$SrcT>() < size_of::<$DstT>() || *self as u64 <= max {
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Some(*self as $DstT)
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} else {
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None
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}
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}
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)*}
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}
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macro_rules! impl_to_primitive_uint_to_uint {
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($SrcT:ident : $( fn $method:ident -> $DstT:ident ; )*) => {$(
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#[inline]
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fn $method(&self) -> Option<$DstT> {
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let max = $DstT::MAX as $SrcT;
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if size_of::<$SrcT>() <= size_of::<$DstT>() || *self <= max {
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Some(*self as $DstT)
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} else {
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None
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}
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}
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)*}
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}
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macro_rules! impl_to_primitive_uint {
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($T:ident) => (
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impl ToPrimitive for $T {
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impl_to_primitive_uint_to_int! { $T:
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fn to_isize -> isize;
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fn to_i8 -> i8;
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fn to_i16 -> i16;
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fn to_i32 -> i32;
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fn to_i64 -> i64;
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}
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impl_to_primitive_uint_to_uint! { $T:
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fn to_usize -> usize;
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fn to_u8 -> u8;
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fn to_u16 -> u16;
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fn to_u32 -> u32;
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fn to_u64 -> u64;
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}
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#[inline]
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fn to_f32(&self) -> Option<f32> { Some(*self as f32) }
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#[inline]
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fn to_f64(&self) -> Option<f64> { Some(*self as f64) }
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}
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)
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}
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impl_to_primitive_uint!(usize);
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impl_to_primitive_uint!(u8);
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impl_to_primitive_uint!(u16);
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impl_to_primitive_uint!(u32);
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impl_to_primitive_uint!(u64);
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macro_rules! impl_to_primitive_float_to_float {
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($SrcT:ident : $( fn $method:ident -> $DstT:ident ; )*) => {$(
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#[inline]
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fn $method(&self) -> Option<$DstT> {
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// Only finite values that are reducing size need to worry about overflow.
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if size_of::<$SrcT>() > size_of::<$DstT>() && FloatCore::is_finite(*self) {
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let n = *self as f64;
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if n < $DstT::MIN as f64 || n > $DstT::MAX as f64 {
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return None;
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}
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}
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// We can safely cast NaN, +-inf, and finite values in range.
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Some(*self as $DstT)
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}
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)*}
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}
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macro_rules! impl_to_primitive_float_to_signed_int {
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($f:ident : $( fn $method:ident -> $i:ident ; )*) => {$(
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#[inline]
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fn $method(&self) -> Option<$i> {
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// Float as int truncates toward zero, so we want to allow values
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// in the exclusive range `(MIN-1, MAX+1)`.
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if size_of::<$f>() > size_of::<$i>() {
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// With a larger size, we can represent the range exactly.
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const MIN_M1: $f = $i::MIN as $f - 1.0;
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const MAX_P1: $f = $i::MAX as $f + 1.0;
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if *self > MIN_M1 && *self < MAX_P1 {
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return Some(*self as $i);
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}
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} else {
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// We can't represent `MIN-1` exactly, but there's no fractional part
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// at this magnitude, so we can just use a `MIN` inclusive boundary.
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const MIN: $f = $i::MIN as $f;
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// We can't represent `MAX` exactly, but it will round up to exactly
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// `MAX+1` (a power of two) when we cast it.
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const MAX_P1: $f = $i::MAX as $f;
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if *self >= MIN && *self < MAX_P1 {
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return Some(*self as $i);
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}
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}
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None
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}
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)*}
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}
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macro_rules! impl_to_primitive_float_to_unsigned_int {
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($f:ident : $( fn $method:ident -> $u:ident ; )*) => {$(
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#[inline]
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fn $method(&self) -> Option<$u> {
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// Float as int truncates toward zero, so we want to allow values
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// in the exclusive range `(-1, MAX+1)`.
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if size_of::<$f>() > size_of::<$u>() {
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// With a larger size, we can represent the range exactly.
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const MAX_P1: $f = $u::MAX as $f + 1.0;
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if *self > -1.0 && *self < MAX_P1 {
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return Some(*self as $u);
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}
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} else {
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// We can't represent `MAX` exactly, but it will round up to exactly
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// `MAX+1` (a power of two) when we cast it.
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const MAX_P1: $f = $u::MAX as $f;
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if *self > -1.0 && *self < MAX_P1 {
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return Some(*self as $u);
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}
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}
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None
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}
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)*}
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}
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macro_rules! impl_to_primitive_float {
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($T:ident) => (
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impl ToPrimitive for $T {
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impl_to_primitive_float_to_signed_int! { $T:
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fn to_isize -> isize;
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fn to_i8 -> i8;
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fn to_i16 -> i16;
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fn to_i32 -> i32;
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fn to_i64 -> i64;
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}
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impl_to_primitive_float_to_unsigned_int! { $T:
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fn to_usize -> usize;
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fn to_u8 -> u8;
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fn to_u16 -> u16;
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fn to_u32 -> u32;
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fn to_u64 -> u64;
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}
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impl_to_primitive_float_to_float! { $T:
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fn to_f32 -> f32;
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fn to_f64 -> f64;
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}
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}
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)
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}
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impl_to_primitive_float!(f32);
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impl_to_primitive_float!(f64);
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/// A generic trait for converting a number to a value.
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pub trait FromPrimitive: Sized {
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/// Convert an `isize` to return an optional value of this type. If the
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/// value cannot be represented by this value, the `None` is returned.
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#[inline]
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fn from_isize(n: isize) -> Option<Self> {
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FromPrimitive::from_i64(n as i64)
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}
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/// Convert an `i8` to return an optional value of this type. If the
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/// type cannot be represented by this value, the `None` is returned.
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#[inline]
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fn from_i8(n: i8) -> Option<Self> {
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FromPrimitive::from_i64(n as i64)
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}
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/// Convert an `i16` to return an optional value of this type. If the
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/// type cannot be represented by this value, the `None` is returned.
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#[inline]
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fn from_i16(n: i16) -> Option<Self> {
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FromPrimitive::from_i64(n as i64)
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}
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/// Convert an `i32` to return an optional value of this type. If the
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/// type cannot be represented by this value, the `None` is returned.
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#[inline]
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fn from_i32(n: i32) -> Option<Self> {
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FromPrimitive::from_i64(n as i64)
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}
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/// Convert an `i64` to return an optional value of this type. If the
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/// type cannot be represented by this value, the `None` is returned.
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fn from_i64(n: i64) -> Option<Self>;
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/// Convert a `usize` to return an optional value of this type. If the
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/// type cannot be represented by this value, the `None` is returned.
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#[inline]
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fn from_usize(n: usize) -> Option<Self> {
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FromPrimitive::from_u64(n as u64)
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}
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/// Convert an `u8` to return an optional value of this type. If the
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/// type cannot be represented by this value, the `None` is returned.
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#[inline]
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fn from_u8(n: u8) -> Option<Self> {
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FromPrimitive::from_u64(n as u64)
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}
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/// Convert an `u16` to return an optional value of this type. If the
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/// type cannot be represented by this value, the `None` is returned.
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#[inline]
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fn from_u16(n: u16) -> Option<Self> {
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FromPrimitive::from_u64(n as u64)
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}
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/// Convert an `u32` to return an optional value of this type. If the
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/// type cannot be represented by this value, the `None` is returned.
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#[inline]
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fn from_u32(n: u32) -> Option<Self> {
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FromPrimitive::from_u64(n as u64)
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}
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/// Convert an `u64` to return an optional value of this type. If the
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/// type cannot be represented by this value, the `None` is returned.
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fn from_u64(n: u64) -> Option<Self>;
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/// Convert a `f32` to return an optional value of this type. If the
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/// type cannot be represented by this value, the `None` is returned.
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#[inline]
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fn from_f32(n: f32) -> Option<Self> {
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FromPrimitive::from_f64(n as f64)
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}
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/// Convert a `f64` to return an optional value of this type. If the
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/// type cannot be represented by this value, the `None` is returned.
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#[inline]
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fn from_f64(n: f64) -> Option<Self> {
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FromPrimitive::from_i64(n as i64)
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}
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}
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macro_rules! impl_from_primitive {
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($T:ty, $to_ty:ident) => (
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#[allow(deprecated)]
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impl FromPrimitive for $T {
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#[inline] fn from_i8(n: i8) -> Option<$T> { n.$to_ty() }
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#[inline] fn from_i16(n: i16) -> Option<$T> { n.$to_ty() }
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#[inline] fn from_i32(n: i32) -> Option<$T> { n.$to_ty() }
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#[inline] fn from_i64(n: i64) -> Option<$T> { n.$to_ty() }
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#[inline] fn from_u8(n: u8) -> Option<$T> { n.$to_ty() }
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#[inline] fn from_u16(n: u16) -> Option<$T> { n.$to_ty() }
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#[inline] fn from_u32(n: u32) -> Option<$T> { n.$to_ty() }
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#[inline] fn from_u64(n: u64) -> Option<$T> { n.$to_ty() }
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#[inline] fn from_f32(n: f32) -> Option<$T> { n.$to_ty() }
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#[inline] fn from_f64(n: f64) -> Option<$T> { n.$to_ty() }
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}
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)
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}
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impl_from_primitive!(isize, to_isize);
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impl_from_primitive!(i8, to_i8);
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impl_from_primitive!(i16, to_i16);
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impl_from_primitive!(i32, to_i32);
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impl_from_primitive!(i64, to_i64);
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impl_from_primitive!(usize, to_usize);
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impl_from_primitive!(u8, to_u8);
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impl_from_primitive!(u16, to_u16);
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impl_from_primitive!(u32, to_u32);
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impl_from_primitive!(u64, to_u64);
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impl_from_primitive!(f32, to_f32);
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impl_from_primitive!(f64, to_f64);
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impl<T: ToPrimitive> ToPrimitive for Wrapping<T> {
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fn to_i64(&self) -> Option<i64> { self.0.to_i64() }
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fn to_u64(&self) -> Option<u64> { self.0.to_u64() }
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}
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impl<T: FromPrimitive> FromPrimitive for Wrapping<T> {
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fn from_u64(n: u64) -> Option<Self> { T::from_u64(n).map(Wrapping) }
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fn from_i64(n: i64) -> Option<Self> { T::from_i64(n).map(Wrapping) }
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}
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/// Cast from one machine scalar to another.
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///
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/// # Examples
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///
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/// ```
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/// # use num_traits as num;
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/// let twenty: f32 = num::cast(0x14).unwrap();
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/// assert_eq!(twenty, 20f32);
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/// ```
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///
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#[inline]
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pub fn cast<T: NumCast, U: NumCast>(n: T) -> Option<U> {
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NumCast::from(n)
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}
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/// An interface for casting between machine scalars.
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pub trait NumCast: Sized + ToPrimitive {
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/// Creates a number from another value that can be converted into
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/// a primitive via the `ToPrimitive` trait.
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fn from<T: ToPrimitive>(n: T) -> Option<Self>;
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}
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macro_rules! impl_num_cast {
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($T:ty, $conv:ident) => (
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impl NumCast for $T {
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#[inline]
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#[allow(deprecated)]
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fn from<N: ToPrimitive>(n: N) -> Option<$T> {
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// `$conv` could be generated using `concat_idents!`, but that
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// macro seems to be broken at the moment
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n.$conv()
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}
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}
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)
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}
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impl_num_cast!(u8, to_u8);
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impl_num_cast!(u16, to_u16);
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impl_num_cast!(u32, to_u32);
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impl_num_cast!(u64, to_u64);
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|
impl_num_cast!(usize, to_usize);
|
|
impl_num_cast!(i8, to_i8);
|
|
impl_num_cast!(i16, to_i16);
|
|
impl_num_cast!(i32, to_i32);
|
|
impl_num_cast!(i64, to_i64);
|
|
impl_num_cast!(isize, to_isize);
|
|
impl_num_cast!(f32, to_f32);
|
|
impl_num_cast!(f64, to_f64);
|
|
|
|
impl<T: NumCast> NumCast for Wrapping<T> {
|
|
fn from<U: ToPrimitive>(n: U) -> Option<Self> {
|
|
T::from(n).map(Wrapping)
|
|
}
|
|
}
|
|
|
|
/// A generic interface for casting between machine scalars with the
|
|
/// `as` operator, which admits narrowing and precision loss.
|
|
/// Implementers of this trait AsPrimitive should behave like a primitive
|
|
/// numeric type (e.g. a newtype around another primitive), and the
|
|
/// intended conversion must never fail.
|
|
///
|
|
/// # Examples
|
|
///
|
|
/// ```
|
|
/// # use num_traits::AsPrimitive;
|
|
/// let three: i32 = (3.14159265f32).as_();
|
|
/// assert_eq!(three, 3);
|
|
/// ```
|
|
///
|
|
/// # Safety
|
|
///
|
|
/// Currently, some uses of the `as` operator are not entirely safe.
|
|
/// In particular, it is undefined behavior if:
|
|
///
|
|
/// - A truncated floating point value cannot fit in the target integer
|
|
/// type ([#10184](https://github.com/rust-lang/rust/issues/10184));
|
|
///
|
|
/// ```ignore
|
|
/// # use num_traits::AsPrimitive;
|
|
/// let x: u8 = (1.04E+17).as_(); // UB
|
|
/// ```
|
|
///
|
|
/// - Or a floating point value does not fit in another floating
|
|
/// point type ([#15536](https://github.com/rust-lang/rust/issues/15536)).
|
|
///
|
|
/// ```ignore
|
|
/// # use num_traits::AsPrimitive;
|
|
/// let x: f32 = (1e300f64).as_(); // UB
|
|
/// ```
|
|
///
|
|
pub trait AsPrimitive<T>: 'static + Copy
|
|
where
|
|
T: 'static + Copy
|
|
{
|
|
/// Convert a value to another, using the `as` operator.
|
|
fn as_(self) -> T;
|
|
}
|
|
|
|
macro_rules! impl_as_primitive {
|
|
($T: ty => $( $U: ty ),* ) => {
|
|
$(
|
|
impl AsPrimitive<$U> for $T {
|
|
#[inline] fn as_(self) -> $U { self as $U }
|
|
}
|
|
)*
|
|
};
|
|
}
|
|
|
|
impl_as_primitive!(u8 => char, u8, i8, u16, i16, u32, i32, u64, isize, usize, i64, f32, f64);
|
|
impl_as_primitive!(i8 => u8, i8, u16, i16, u32, i32, u64, isize, usize, i64, f32, f64);
|
|
impl_as_primitive!(u16 => u8, i8, u16, i16, u32, i32, u64, isize, usize, i64, f32, f64);
|
|
impl_as_primitive!(i16 => u8, i8, u16, i16, u32, i32, u64, isize, usize, i64, f32, f64);
|
|
impl_as_primitive!(u32 => u8, i8, u16, i16, u32, i32, u64, isize, usize, i64, f32, f64);
|
|
impl_as_primitive!(i32 => u8, i8, u16, i16, u32, i32, u64, isize, usize, i64, f32, f64);
|
|
impl_as_primitive!(u64 => u8, i8, u16, i16, u32, i32, u64, isize, usize, i64, f32, f64);
|
|
impl_as_primitive!(i64 => u8, i8, u16, i16, u32, i32, u64, isize, usize, i64, f32, f64);
|
|
impl_as_primitive!(usize => u8, i8, u16, i16, u32, i32, u64, isize, usize, i64, f32, f64);
|
|
impl_as_primitive!(isize => u8, i8, u16, i16, u32, i32, u64, isize, usize, i64, f32, f64);
|
|
impl_as_primitive!(f32 => u8, i8, u16, i16, u32, i32, u64, isize, usize, i64, f32, f64);
|
|
impl_as_primitive!(f64 => u8, i8, u16, i16, u32, i32, u64, isize, usize, i64, f32, f64);
|
|
impl_as_primitive!(char => char, u8, i8, u16, i16, u32, i32, u64, isize, usize, i64);
|
|
impl_as_primitive!(bool => u8, i8, u16, i16, u32, i32, u64, isize, usize, i64);
|
|
|
|
#[test]
|
|
fn to_primitive_float() {
|
|
use core::f32;
|
|
use core::f64;
|
|
|
|
let f32_toolarge = 1e39f64;
|
|
assert_eq!(f32_toolarge.to_f32(), None);
|
|
assert_eq!((f32::MAX as f64).to_f32(), Some(f32::MAX));
|
|
assert_eq!((-f32::MAX as f64).to_f32(), Some(-f32::MAX));
|
|
assert_eq!(f64::INFINITY.to_f32(), Some(f32::INFINITY));
|
|
assert_eq!((f64::NEG_INFINITY).to_f32(), Some(f32::NEG_INFINITY));
|
|
assert!((f64::NAN).to_f32().map_or(false, |f| f.is_nan()));
|
|
}
|
|
|
|
#[test]
|
|
fn wrapping_to_primitive() {
|
|
macro_rules! test_wrapping_to_primitive {
|
|
($($t:ty)+) => {
|
|
$({
|
|
let i: $t = 0;
|
|
let w = Wrapping(i);
|
|
assert_eq!(i.to_u8(), w.to_u8());
|
|
assert_eq!(i.to_u16(), w.to_u16());
|
|
assert_eq!(i.to_u32(), w.to_u32());
|
|
assert_eq!(i.to_u64(), w.to_u64());
|
|
assert_eq!(i.to_usize(), w.to_usize());
|
|
assert_eq!(i.to_i8(), w.to_i8());
|
|
assert_eq!(i.to_i16(), w.to_i16());
|
|
assert_eq!(i.to_i32(), w.to_i32());
|
|
assert_eq!(i.to_i64(), w.to_i64());
|
|
assert_eq!(i.to_isize(), w.to_isize());
|
|
assert_eq!(i.to_f32(), w.to_f32());
|
|
assert_eq!(i.to_f64(), w.to_f64());
|
|
})+
|
|
};
|
|
}
|
|
|
|
test_wrapping_to_primitive!(usize u8 u16 u32 u64 isize i8 i16 i32 i64);
|
|
}
|
|
|
|
#[test]
|
|
fn wrapping_is_toprimitive() {
|
|
fn require_toprimitive<T: ToPrimitive>(_: &T) {}
|
|
require_toprimitive(&Wrapping(42));
|
|
}
|
|
|
|
#[test]
|
|
fn wrapping_is_fromprimitive() {
|
|
fn require_fromprimitive<T: FromPrimitive>(_: &T) {}
|
|
require_fromprimitive(&Wrapping(42));
|
|
}
|
|
|
|
#[test]
|
|
fn wrapping_is_numcast() {
|
|
fn require_numcast<T: NumCast>(_: &T) {}
|
|
require_numcast(&Wrapping(42));
|
|
}
|
|
|
|
#[test]
|
|
fn as_primitive() {
|
|
let x: f32 = (1.625f64).as_();
|
|
assert_eq!(x, 1.625f32);
|
|
|
|
let x: f32 = (3.14159265358979323846f64).as_();
|
|
assert_eq!(x, 3.1415927f32);
|
|
|
|
let x: u8 = (768i16).as_();
|
|
assert_eq!(x, 0);
|
|
}
|
|
|
|
#[test]
|
|
fn float_to_integer_checks_overflow() {
|
|
// This will overflow an i32
|
|
let source: f64 = 1.0e+123f64;
|
|
|
|
// Expect the overflow to be caught
|
|
assert_eq!(cast::<f64, i32>(source), None);
|
|
}
|
|
|
|
#[test]
|
|
fn cast_to_int_checks_overflow() {
|
|
let big_f: f64 = 1.0e123;
|
|
let normal_f: f64 = 1.0;
|
|
let small_f: f64 = -1.0e123;
|
|
assert_eq!(None, cast::<f64, isize>(big_f));
|
|
assert_eq!(None, cast::<f64, i8>(big_f));
|
|
assert_eq!(None, cast::<f64, i16>(big_f));
|
|
assert_eq!(None, cast::<f64, i32>(big_f));
|
|
assert_eq!(None, cast::<f64, i64>(big_f));
|
|
|
|
assert_eq!(Some(normal_f as isize), cast::<f64, isize>(normal_f));
|
|
assert_eq!(Some(normal_f as i8), cast::<f64, i8>(normal_f));
|
|
assert_eq!(Some(normal_f as i16), cast::<f64, i16>(normal_f));
|
|
assert_eq!(Some(normal_f as i32), cast::<f64, i32>(normal_f));
|
|
assert_eq!(Some(normal_f as i64), cast::<f64, i64>(normal_f));
|
|
|
|
assert_eq!(None, cast::<f64, isize>(small_f));
|
|
assert_eq!(None, cast::<f64, i8>(small_f));
|
|
assert_eq!(None, cast::<f64, i16>(small_f));
|
|
assert_eq!(None, cast::<f64, i32>(small_f));
|
|
assert_eq!(None, cast::<f64, i64>(small_f));
|
|
}
|
|
|
|
#[test]
|
|
fn cast_to_unsigned_int_checks_overflow() {
|
|
let big_f: f64 = 1.0e123;
|
|
let normal_f: f64 = 1.0;
|
|
let small_f: f64 = -1.0e123;
|
|
assert_eq!(None, cast::<f64, usize>(big_f));
|
|
assert_eq!(None, cast::<f64, u8>(big_f));
|
|
assert_eq!(None, cast::<f64, u16>(big_f));
|
|
assert_eq!(None, cast::<f64, u32>(big_f));
|
|
assert_eq!(None, cast::<f64, u64>(big_f));
|
|
|
|
assert_eq!(Some(normal_f as usize), cast::<f64, usize>(normal_f));
|
|
assert_eq!(Some(normal_f as u8), cast::<f64, u8>(normal_f));
|
|
assert_eq!(Some(normal_f as u16), cast::<f64, u16>(normal_f));
|
|
assert_eq!(Some(normal_f as u32), cast::<f64, u32>(normal_f));
|
|
assert_eq!(Some(normal_f as u64), cast::<f64, u64>(normal_f));
|
|
|
|
assert_eq!(None, cast::<f64, usize>(small_f));
|
|
assert_eq!(None, cast::<f64, u8>(small_f));
|
|
assert_eq!(None, cast::<f64, u16>(small_f));
|
|
assert_eq!(None, cast::<f64, u32>(small_f));
|
|
assert_eq!(None, cast::<f64, u64>(small_f));
|
|
}
|
|
|
|
#[cfg(all(test, feature = "std"))]
|
|
fn dbg(args: ::core::fmt::Arguments) {
|
|
println!("{}", args);
|
|
}
|
|
|
|
#[cfg(all(test, not(feature = "std")))]
|
|
fn dbg(_: ::core::fmt::Arguments) {}
|
|
|
|
// Rust 1.8 doesn't handle cfg on macros correctly
|
|
// #[cfg(test)]
|
|
#[allow(unused)]
|
|
macro_rules! dbg { ($($tok:tt)*) => { dbg(format_args!($($tok)*)) } }
|
|
|
|
#[test]
|
|
fn cast_float_to_int_edge_cases() {
|
|
use core::mem::transmute;
|
|
|
|
trait RawOffset: Sized {
|
|
type Raw;
|
|
fn raw_offset(self, offset: Self::Raw) -> Self;
|
|
}
|
|
impl RawOffset for f32 {
|
|
type Raw = i32;
|
|
fn raw_offset(self, offset: Self::Raw) -> Self {
|
|
unsafe {
|
|
let raw: Self::Raw = transmute(self);
|
|
transmute(raw + offset)
|
|
}
|
|
}
|
|
}
|
|
impl RawOffset for f64 {
|
|
type Raw = i64;
|
|
fn raw_offset(self, offset: Self::Raw) -> Self {
|
|
unsafe {
|
|
let raw: Self::Raw = transmute(self);
|
|
transmute(raw + offset)
|
|
}
|
|
}
|
|
}
|
|
|
|
macro_rules! test_edge {
|
|
($f:ident -> $($t:ident)+) => { $({
|
|
dbg!("testing cast edge cases for {} -> {}", stringify!($f), stringify!($t));
|
|
|
|
let small = if $t::MIN == 0 || size_of::<$t>() < size_of::<$f>() {
|
|
$t::MIN as $f - 1.0
|
|
} else {
|
|
($t::MIN as $f).raw_offset(1).floor()
|
|
};
|
|
let fmin = small.raw_offset(-1);
|
|
dbg!(" testing min {}\n\tvs. {:.16}\n\tand {:.16}", $t::MIN, fmin, small);
|
|
assert_eq!(Some($t::MIN), cast::<$f, $t>($t::MIN as $f));
|
|
assert_eq!(Some($t::MIN), cast::<$f, $t>(fmin));
|
|
assert_eq!(None, cast::<$f, $t>(small));
|
|
|
|
let (max, large) = if size_of::<$t>() < size_of::<$f>() {
|
|
($t::MAX, $t::MAX as $f + 1.0)
|
|
} else {
|
|
let large = $t::MAX as $f; // rounds up!
|
|
let max = large.raw_offset(-1) as $t; // the next smallest possible
|
|
assert_eq!(max.count_ones(), $f::MANTISSA_DIGITS);
|
|
(max, large)
|
|
};
|
|
let fmax = large.raw_offset(-1);
|
|
dbg!(" testing max {}\n\tvs. {:.16}\n\tand {:.16}", max, fmax, large);
|
|
assert_eq!(Some(max), cast::<$f, $t>(max as $f));
|
|
assert_eq!(Some(max), cast::<$f, $t>(fmax));
|
|
assert_eq!(None, cast::<$f, $t>(large));
|
|
|
|
dbg!(" testing non-finite values");
|
|
assert_eq!(None, cast::<$f, $t>($f::NAN));
|
|
assert_eq!(None, cast::<$f, $t>($f::INFINITY));
|
|
assert_eq!(None, cast::<$f, $t>($f::NEG_INFINITY));
|
|
})+}
|
|
}
|
|
|
|
test_edge!(f32 -> isize i8 i16 i32 i64);
|
|
test_edge!(f32 -> usize u8 u16 u32 u64);
|
|
test_edge!(f64 -> isize i8 i16 i32 i64);
|
|
test_edge!(f64 -> usize u8 u16 u32 u64);
|
|
}
|
|
|
|
#[test]
|
|
fn cast_int_to_int_edge_cases() {
|
|
use core::cmp::Ordering::*;
|
|
|
|
macro_rules! test_edge {
|
|
($f:ident -> $($t:ident)+) => { $({
|
|
fn test_edge() {
|
|
dbg!("testing cast edge cases for {} -> {}", stringify!($f), stringify!($t));
|
|
|
|
match ($f::MIN as i64).cmp(&($t::MIN as i64)) {
|
|
Greater => {
|
|
assert_eq!(Some($f::MIN as $t), cast::<$f, $t>($f::MIN));
|
|
}
|
|
Equal => {
|
|
assert_eq!(Some($t::MIN), cast::<$f, $t>($f::MIN));
|
|
}
|
|
Less => {
|
|
let min = $t::MIN as $f;
|
|
assert_eq!(Some($t::MIN), cast::<$f, $t>(min));
|
|
assert_eq!(None, cast::<$f, $t>(min - 1));
|
|
}
|
|
}
|
|
|
|
match ($f::MAX as u64).cmp(&($t::MAX as u64)) {
|
|
Greater => {
|
|
let max = $t::MAX as $f;
|
|
assert_eq!(Some($t::MAX), cast::<$f, $t>(max));
|
|
assert_eq!(None, cast::<$f, $t>(max + 1));
|
|
}
|
|
Equal => {
|
|
assert_eq!(Some($t::MAX), cast::<$f, $t>($f::MAX));
|
|
}
|
|
Less => {
|
|
assert_eq!(Some($f::MAX as $t), cast::<$f, $t>($f::MAX));
|
|
}
|
|
}
|
|
}
|
|
test_edge();
|
|
})+};
|
|
($( $from:ident )+) => { $({
|
|
test_edge!($from -> isize i8 i16 i32 i64);
|
|
test_edge!($from -> usize u8 u16 u32 u64);
|
|
})+}
|
|
}
|
|
|
|
test_edge!(isize i8 i16 i32 i64);
|
|
test_edge!(usize u8 u16 u32 u64);
|
|
}
|