impl 128-bit numeric casts
This includes new conditional methods `ToPrimitive::{to_i128,to_u128}`
and `FromPrimitive::{from_i128,from_u128}`. Since features can only be
additive, these methods must not cause a breaking change to anyone when
enabled -- thus they have a default implementation that converts through
64-bit values. Types that can do better with a full 128-bit integer,
like bigint or floating-point, will probably want to override these.
This commit is contained in:
Josh Stone
parent
6161f1ade1
commit
bbbc2bd1d7
478
src/cast.rs
478
src/cast.rs
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@ -3,6 +3,8 @@ 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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#[cfg(feature = "i128")]
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use core::{i128, u128};
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use float::FloatCore;
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@ -35,6 +37,18 @@ pub trait ToPrimitive {
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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 an `i128`.
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///
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/// This method is only available with feature `i128` enabled on Rust >= 1.26.
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///
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/// The default implementation converts through `to_i64()`. Types implementing
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/// this trait should override this method if they can represent a greater range.
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#[inline]
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#[cfg(feature = "i128")]
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fn to_i128(&self) -> Option<i128> {
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self.to_i64().map(From::from)
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}
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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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@ -63,6 +77,18 @@ pub trait ToPrimitive {
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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 `u128`.
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///
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/// This method is only available with feature `i128` enabled on Rust >= 1.26.
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///
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/// The default implementation converts through `to_u64()`. Types implementing
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/// this trait should override this method if they can represent a greater range.
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#[inline]
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#[cfg(feature = "i128")]
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fn to_u128(&self) -> Option<u128> {
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self.to_u64().map(From::from)
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}
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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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@ -77,8 +103,9 @@ pub trait ToPrimitive {
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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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($SrcT:ident : $( $(#[$cfg:meta])* fn $method:ident -> $DstT:ident ; )*) => {$(
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#[inline]
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$(#[$cfg])*
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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 $SrcT;
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@ -92,11 +119,12 @@ macro_rules! impl_to_primitive_int_to_int {
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}
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macro_rules! impl_to_primitive_int_to_uint {
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($SrcT:ident : $( fn $method:ident -> $DstT:ident ; )*) => {$(
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($SrcT:ident : $( $(#[$cfg:meta])* fn $method:ident -> $DstT:ident ; )*) => {$(
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#[inline]
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$(#[$cfg])*
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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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let max = $DstT::MAX as $SrcT;
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if 0 <= *self && (size_of::<$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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@ -114,6 +142,8 @@ macro_rules! impl_to_primitive_int {
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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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#[cfg(feature = "i128")]
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fn to_i128 -> i128;
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}
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impl_to_primitive_int_to_uint! { $T:
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@ -122,6 +152,8 @@ macro_rules! impl_to_primitive_int {
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fn to_u16 -> u16;
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fn to_u32 -> u32;
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fn to_u64 -> u64;
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#[cfg(feature = "i128")]
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fn to_u128 -> u128;
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}
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#[inline]
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@ -137,13 +169,16 @@ impl_to_primitive_int!(i8);
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impl_to_primitive_int!(i16);
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impl_to_primitive_int!(i32);
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impl_to_primitive_int!(i64);
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#[cfg(feature = "i128")]
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impl_to_primitive_int!(i128);
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macro_rules! impl_to_primitive_uint_to_int {
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($SrcT:ident : $( fn $method:ident -> $DstT:ident ; )*) => {$(
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($SrcT:ident : $( $(#[$cfg:meta])* fn $method:ident -> $DstT:ident ; )*) => {$(
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#[inline]
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$(#[$cfg])*
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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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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 $DstT)
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} else {
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None
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@ -153,8 +188,9 @@ macro_rules! impl_to_primitive_uint_to_int {
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}
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macro_rules! impl_to_primitive_uint_to_uint {
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($SrcT:ident : $( fn $method:ident -> $DstT:ident ; )*) => {$(
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($SrcT:ident : $( $(#[$cfg:meta])* fn $method:ident -> $DstT:ident ; )*) => {$(
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#[inline]
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$(#[$cfg])*
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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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@ -175,6 +211,8 @@ macro_rules! impl_to_primitive_uint {
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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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#[cfg(feature = "i128")]
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fn to_i128 -> i128;
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}
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impl_to_primitive_uint_to_uint! { $T:
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@ -183,6 +221,8 @@ macro_rules! impl_to_primitive_uint {
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fn to_u16 -> u16;
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fn to_u32 -> u32;
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fn to_u64 -> u64;
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#[cfg(feature = "i128")]
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fn to_u128 -> u128;
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}
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#[inline]
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@ -198,6 +238,8 @@ impl_to_primitive_uint!(u8);
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impl_to_primitive_uint!(u16);
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impl_to_primitive_uint!(u32);
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impl_to_primitive_uint!(u64);
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#[cfg(feature = "i128")]
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impl_to_primitive_uint!(u128);
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macro_rules! impl_to_primitive_float_to_float {
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($SrcT:ident : $( fn $method:ident -> $DstT:ident ; )*) => {$(
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@ -217,8 +259,9 @@ macro_rules! impl_to_primitive_float_to_float {
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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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($f:ident : $( $(#[$cfg:meta])* fn $method:ident -> $i:ident ; )*) => {$(
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#[inline]
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$(#[$cfg])*
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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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@ -246,8 +289,9 @@ macro_rules! impl_to_primitive_float_to_signed_int {
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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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($f:ident : $( $(#[$cfg:meta])* fn $method:ident -> $u:ident ; )*) => {$(
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#[inline]
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$(#[$cfg])*
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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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@ -260,6 +304,7 @@ macro_rules! impl_to_primitive_float_to_unsigned_int {
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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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// (`u128::MAX as f32` is infinity, but this is still ok.)
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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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@ -279,6 +324,8 @@ macro_rules! impl_to_primitive_float {
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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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#[cfg(feature = "i128")]
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fn to_i128 -> i128;
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}
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impl_to_primitive_float_to_unsigned_int! { $T:
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@ -287,6 +334,8 @@ macro_rules! impl_to_primitive_float {
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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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#[cfg(feature = "i128")]
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fn to_u128 -> u128;
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}
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impl_to_primitive_float_to_float! { $T:
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@ -334,6 +383,19 @@ pub trait FromPrimitive: Sized {
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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 an `i128` 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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///
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/// This method is only available with feature `i128` enabled on Rust >= 1.26.
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///
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/// The default implementation converts through `from_i64()`. Types implementing
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/// this trait should override this method if they can represent a greater range.
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#[inline]
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#[cfg(feature = "i128")]
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fn from_i128(n: i128) -> Option<Self> {
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n.to_i64().and_then(FromPrimitive::from_i64)
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}
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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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@ -366,6 +428,19 @@ pub trait FromPrimitive: Sized {
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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 an `u128` 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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///
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/// This method is only available with feature `i128` enabled on Rust >= 1.26.
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///
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/// The default implementation converts through `from_u64()`. Types implementing
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/// this trait should override this method if they can represent a greater range.
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#[inline]
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#[cfg(feature = "i128")]
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fn from_u128(n: u128) -> Option<Self> {
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n.to_u64().and_then(FromPrimitive::from_u64)
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}
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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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@ -389,11 +464,15 @@ macro_rules! impl_from_primitive {
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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.$to_ty() }
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#[cfg(feature = "i128")]
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#[inline] fn from_i128(n: i128) -> Option<$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.$to_ty() }
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#[cfg(feature = "i128")]
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#[inline] fn from_u128(n: u128) -> Option<$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.$to_ty() }
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@ -406,22 +485,83 @@ impl_from_primitive!(i8, to_i8);
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impl_from_primitive!(i16, to_i16);
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impl_from_primitive!(i32, to_i32);
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impl_from_primitive!(i64, to_i64);
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#[cfg(feature = "i128")]
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impl_from_primitive!(i128, to_i128);
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impl_from_primitive!(usize, to_usize);
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impl_from_primitive!(u8, to_u8);
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impl_from_primitive!(u16, to_u16);
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impl_from_primitive!(u32, to_u32);
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impl_from_primitive!(u64, to_u64);
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#[cfg(feature = "i128")]
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impl_from_primitive!(u128, to_u128);
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impl_from_primitive!(f32, to_f32);
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impl_from_primitive!(f64, to_f64);
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impl<T: ToPrimitive> ToPrimitive for Wrapping<T> {
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fn to_i64(&self) -> Option<i64> { self.0.to_i64() }
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fn to_u64(&self) -> Option<u64> { self.0.to_u64() }
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macro_rules! impl_to_primitive_wrapping {
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($( $(#[$cfg:meta])* fn $method:ident -> $i:ident ; )*) => {$(
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#[inline]
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$(#[$cfg])*
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fn $method(&self) -> Option<$i> {
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(self.0).$method()
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}
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)*}
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}
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impl<T: ToPrimitive> ToPrimitive for Wrapping<T> {
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impl_to_primitive_wrapping! {
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fn to_isize -> isize;
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fn to_i8 -> i8;
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fn to_i16 -> i16;
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fn to_i32 -> i32;
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fn to_i64 -> i64;
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#[cfg(feature = "i128")]
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fn to_i128 -> i128;
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fn to_usize -> usize;
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fn to_u8 -> u8;
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fn to_u16 -> u16;
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fn to_u32 -> u32;
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fn to_u64 -> u64;
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#[cfg(feature = "i128")]
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fn to_u128 -> u128;
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fn to_f32 -> f32;
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fn to_f64 -> f64;
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}
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}
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macro_rules! impl_from_primitive_wrapping {
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($( $(#[$cfg:meta])* fn $method:ident ( $i:ident ); )*) => {$(
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#[inline]
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$(#[$cfg])*
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fn $method(n: $i) -> Option<Self> {
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T::$method(n).map(Wrapping)
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}
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)*}
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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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impl_from_primitive_wrapping! {
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fn from_isize(isize);
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fn from_i8(i8);
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fn from_i16(i16);
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fn from_i32(i32);
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fn from_i64(i64);
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#[cfg(feature = "i128")]
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fn from_i128(i128);
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fn from_usize(usize);
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fn from_u8(u8);
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fn from_u16(u16);
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fn from_u32(u32);
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fn from_u64(u64);
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#[cfg(feature = "i128")]
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fn from_u128(u128);
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fn from_f32(f32);
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fn from_f64(f64);
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}
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}
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@ -465,11 +605,15 @@ 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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#[cfg(feature = "i128")]
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impl_num_cast!(u128, to_u128);
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impl_num_cast!(usize, to_usize);
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impl_num_cast!(i8, to_i8);
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impl_num_cast!(i16, to_i16);
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impl_num_cast!(i32, to_i32);
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impl_num_cast!(i64, to_i64);
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#[cfg(feature = "i128")]
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impl_num_cast!(i128, to_i128);
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impl_num_cast!(isize, to_isize);
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impl_num_cast!(f32, to_f32);
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impl_num_cast!(f64, to_f64);
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@ -524,284 +668,40 @@ where
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}
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macro_rules! impl_as_primitive {
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($T: ty => $( $U: ty ),* ) => {
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$(
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(@ $T: ty => $(#[$cfg:meta])* impl $U: ty ) => {
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$(#[$cfg])*
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impl AsPrimitive<$U> for $T {
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#[inline] fn as_(self) -> $U { self as $U }
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}
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)*
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};
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(@ $T: ty => { $( $U: ty ),* } ) => {$(
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impl_as_primitive!(@ $T => impl $U);
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)*};
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($T: ty => { $( $U: ty ),* } ) => {
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impl_as_primitive!(@ $T => { $( $U ),* });
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impl_as_primitive!(@ $T => { u8, u16, u32, u64, usize });
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impl_as_primitive!(@ $T => #[cfg(feature = "i128")] impl u128);
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impl_as_primitive!(@ $T => { i8, i16, i32, i64, isize });
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||||
impl_as_primitive!(@ $T => #[cfg(feature = "i128")] impl i128);
|
||||
};
|
||||
}
|
||||
|
||||
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);
|
||||
impl_as_primitive!(u8 => { char, f32, f64 });
|
||||
impl_as_primitive!(i8 => { f32, f64 });
|
||||
impl_as_primitive!(u16 => { f32, f64 });
|
||||
impl_as_primitive!(i16 => { f32, f64 });
|
||||
impl_as_primitive!(u32 => { f32, f64 });
|
||||
impl_as_primitive!(i32 => { f32, f64 });
|
||||
impl_as_primitive!(u64 => { f32, f64 });
|
||||
impl_as_primitive!(i64 => { f32, f64 });
|
||||
#[cfg(feature = "i128")]
|
||||
impl_as_primitive!(u128 => { f32, f64 });
|
||||
#[cfg(feature = "i128")]
|
||||
impl_as_primitive!(i128 => { f32, f64 });
|
||||
impl_as_primitive!(usize => { f32, f64 });
|
||||
impl_as_primitive!(isize => { f32, f64 });
|
||||
impl_as_primitive!(f32 => { f32, f64 });
|
||||
impl_as_primitive!(f64 => { f32, f64 });
|
||||
impl_as_primitive!(char => { char });
|
||||
impl_as_primitive!(bool => {});
|
||||
|
||||
#[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!($from -> usize u8 u16 u32 u64);
|
||||
})+}
|
||||
}
|
||||
|
||||
test_edge!(isize i8 i16 i32 i64);
|
||||
test_edge!(usize u8 u16 u32 u64);
|
||||
}
|
||||
|
|
|
|||
|
|
@ -0,0 +1,319 @@
|
|||
//! Tests of `num_traits::cast`.
|
||||
|
||||
#![no_std]
|
||||
|
||||
#[cfg(feature = "std")]
|
||||
#[macro_use]
|
||||
extern crate std;
|
||||
|
||||
extern crate num_traits;
|
||||
|
||||
use num_traits::cast::*;
|
||||
|
||||
use core::{i8, i16, i32, i64, isize};
|
||||
use core::{u8, u16, u32, u64, usize};
|
||||
use core::{f32, f64};
|
||||
#[cfg(feature = "i128")]
|
||||
use core::{i128, u128};
|
||||
|
||||
use core::mem;
|
||||
use core::num::Wrapping;
|
||||
|
||||
#[test]
|
||||
fn to_primitive_float() {
|
||||
let f32_toolarge = 1e39f64;
|
||||
assert_eq!(f32_toolarge.to_f32(), None);
|
||||
assert_eq!((f32::MAX as f64).to_f32(), Some(f32::MAX));
|
||||
assert_eq!((-f32::MAX as f64).to_f32(), Some(-f32::MAX));
|
||||
assert_eq!(f64::INFINITY.to_f32(), Some(f32::INFINITY));
|
||||
assert_eq!((f64::NEG_INFINITY).to_f32(), Some(f32::NEG_INFINITY));
|
||||
assert!((f64::NAN).to_f32().map_or(false, |f| f.is_nan()));
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn wrapping_to_primitive() {
|
||||
macro_rules! test_wrapping_to_primitive {
|
||||
($($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));
|
||||
}
|
||||
|
||||
#[test]
|
||||
#[cfg(feature = "i128")]
|
||||
fn cast_to_i128_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, i128>(big_f));
|
||||
assert_eq!(None, cast::<f64, u128>(big_f));
|
||||
|
||||
assert_eq!(Some(normal_f as i128), cast::<f64, i128>(normal_f));
|
||||
assert_eq!(Some(normal_f as u128), cast::<f64, u128>(normal_f));
|
||||
|
||||
assert_eq!(None, cast::<f64, i128>(small_f));
|
||||
assert_eq!(None, cast::<f64, u128>(small_f));
|
||||
}
|
||||
|
||||
#[cfg(feature = "std")]
|
||||
fn dbg(args: ::core::fmt::Arguments) {
|
||||
println!("{}", args);
|
||||
}
|
||||
|
||||
#[cfg(not(feature = "std"))]
|
||||
fn dbg(_: ::core::fmt::Arguments) {}
|
||||
|
||||
// Rust 1.8 doesn't handle cfg on macros correctly
|
||||
macro_rules! dbg { ($($tok:tt)*) => { dbg(format_args!($($tok)*)) } }
|
||||
|
||||
macro_rules! float_test_edge {
|
||||
($f:ident -> $($t:ident)+) => { $({
|
||||
dbg!("testing cast edge cases for {} -> {}", stringify!($f), stringify!($t));
|
||||
|
||||
let small = if $t::MIN == 0 || mem::size_of::<$t>() < mem::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. {:.0}\n\tand {:.0}", $t::MIN, fmin, small);
|
||||
assert_eq!(Some($t::MIN), cast::<$f, $t>($t::MIN as $f));
|
||||
assert_eq!(Some($t::MIN), cast::<$f, $t>(fmin));
|
||||
assert_eq!(None, cast::<$f, $t>(small));
|
||||
|
||||
let (max, large) = if mem::size_of::<$t>() < mem::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(), $f::MANTISSA_DIGITS);
|
||||
(max, large)
|
||||
};
|
||||
let fmax = large.raw_offset(-1);
|
||||
dbg!(" testing max {}\n\tvs. {:.0}\n\tand {:.0}", max, fmax, large);
|
||||
assert_eq!(Some(max), cast::<$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));
|
||||
})+}
|
||||
}
|
||||
|
||||
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 = mem::transmute(self);
|
||||
mem::transmute(raw + offset)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
impl RawOffset for f64 {
|
||||
type Raw = i64;
|
||||
fn raw_offset(self, offset: Self::Raw) -> Self {
|
||||
unsafe {
|
||||
let raw: Self::Raw = mem::transmute(self);
|
||||
mem::transmute(raw + offset)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn cast_float_to_int_edge_cases() {
|
||||
float_test_edge!(f32 -> isize i8 i16 i32 i64);
|
||||
float_test_edge!(f32 -> usize u8 u16 u32 u64);
|
||||
float_test_edge!(f64 -> isize i8 i16 i32 i64);
|
||||
float_test_edge!(f64 -> usize u8 u16 u32 u64);
|
||||
}
|
||||
|
||||
#[test]
|
||||
#[cfg(feature = "i128")]
|
||||
fn cast_float_to_i128_edge_cases() {
|
||||
float_test_edge!(f32 -> i128 u128);
|
||||
float_test_edge!(f64 -> i128 u128);
|
||||
}
|
||||
|
||||
macro_rules! int_test_edge {
|
||||
($f:ident -> { $($t:ident)+ } with $BigS:ident $BigU:ident ) => { $({
|
||||
fn test_edge() {
|
||||
dbg!("testing cast edge cases for {} -> {}", stringify!($f), stringify!($t));
|
||||
|
||||
match ($f::MIN as $BigS).cmp(&($t::MIN as $BigS)) {
|
||||
Greater => {
|
||||
assert_eq!(Some($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 $BigU).cmp(&($t::MAX as $BigU)) {
|
||||
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();
|
||||
})+}
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn cast_int_to_int_edge_cases() {
|
||||
use core::cmp::Ordering::*;
|
||||
|
||||
macro_rules! test_edge {
|
||||
($( $from:ident )+) => { $({
|
||||
int_test_edge!($from -> { isize i8 i16 i32 i64 } with i64 u64);
|
||||
int_test_edge!($from -> { usize u8 u16 u32 u64 } with i64 u64);
|
||||
})+}
|
||||
}
|
||||
|
||||
test_edge!(isize i8 i16 i32 i64);
|
||||
test_edge!(usize u8 u16 u32 u64);
|
||||
}
|
||||
|
||||
#[test]
|
||||
#[cfg(feature = "i128")]
|
||||
fn cast_int_to_128_edge_cases() {
|
||||
use core::cmp::Ordering::*;
|
||||
|
||||
macro_rules! test_edge {
|
||||
($( $t:ident )+) => {
|
||||
$(
|
||||
int_test_edge!($t -> { i128 u128 } with i128 u128);
|
||||
)+
|
||||
int_test_edge!(i128 -> { $( $t )+ } with i128 u128);
|
||||
int_test_edge!(u128 -> { $( $t )+ } with i128 u128);
|
||||
}
|
||||
}
|
||||
|
||||
test_edge!(isize i8 i16 i32 i64 i128);
|
||||
test_edge!(usize u8 u16 u32 u64 u128);
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue