434 lines
14 KiB
Rust
434 lines
14 KiB
Rust
use std::mem::size_of;
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use identities::Zero;
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use bounds::Bounded;
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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:ty, $DstT:ty, $slf:expr) => (
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{
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if size_of::<$SrcT>() <= size_of::<$DstT>() {
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Some($slf as $DstT)
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} else {
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let n = $slf as i64;
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let min_value: $DstT = Bounded::min_value();
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let max_value: $DstT = Bounded::max_value();
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if min_value as i64 <= n && n <= max_value as i64 {
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Some($slf as $DstT)
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} else {
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None
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}
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}
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}
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)
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}
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macro_rules! impl_to_primitive_int_to_uint {
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($SrcT:ty, $DstT:ty, $slf:expr) => (
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{
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let zero: $SrcT = Zero::zero();
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let max_value: $DstT = Bounded::max_value();
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if zero <= $slf && $slf as u64 <= max_value as u64 {
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Some($slf 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:ty) => (
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impl ToPrimitive for $T {
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#[inline]
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fn to_isize(&self) -> Option<isize> { impl_to_primitive_int_to_int!($T, isize, *self) }
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#[inline]
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fn to_i8(&self) -> Option<i8> { impl_to_primitive_int_to_int!($T, i8, *self) }
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#[inline]
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fn to_i16(&self) -> Option<i16> { impl_to_primitive_int_to_int!($T, i16, *self) }
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#[inline]
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fn to_i32(&self) -> Option<i32> { impl_to_primitive_int_to_int!($T, i32, *self) }
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#[inline]
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fn to_i64(&self) -> Option<i64> { impl_to_primitive_int_to_int!($T, i64, *self) }
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#[inline]
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fn to_usize(&self) -> Option<usize> { impl_to_primitive_int_to_uint!($T, usize, *self) }
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#[inline]
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fn to_u8(&self) -> Option<u8> { impl_to_primitive_int_to_uint!($T, u8, *self) }
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#[inline]
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fn to_u16(&self) -> Option<u16> { impl_to_primitive_int_to_uint!($T, u16, *self) }
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#[inline]
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fn to_u32(&self) -> Option<u32> { impl_to_primitive_int_to_uint!($T, u32, *self) }
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#[inline]
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fn to_u64(&self) -> Option<u64> { impl_to_primitive_int_to_uint!($T, u64, *self) }
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#[inline]
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fn to_f32(&self) -> Option<f32> { Some(*self as f32) }
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#[inline]
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fn to_f64(&self) -> Option<f64> { Some(*self as f64) }
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}
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)
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}
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impl_to_primitive_int!(isize);
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impl_to_primitive_int!(i8);
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impl_to_primitive_int!(i16);
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impl_to_primitive_int!(i32);
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impl_to_primitive_int!(i64);
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macro_rules! impl_to_primitive_uint_to_int {
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($DstT:ty, $slf:expr) => (
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{
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let max_value: $DstT = Bounded::max_value();
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if $slf as u64 <= max_value as u64 {
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Some($slf 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:ty, $DstT:ty, $slf:expr) => (
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{
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if size_of::<$SrcT>() <= size_of::<$DstT>() {
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Some($slf as $DstT)
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} else {
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let zero: $SrcT = Zero::zero();
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let max_value: $DstT = Bounded::max_value();
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if zero <= $slf && $slf as u64 <= max_value as u64 {
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Some($slf as $DstT)
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} else {
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None
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}
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}
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}
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)
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}
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macro_rules! impl_to_primitive_uint {
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($T:ty) => (
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impl ToPrimitive for $T {
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#[inline]
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fn to_isize(&self) -> Option<isize> { impl_to_primitive_uint_to_int!(isize, *self) }
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#[inline]
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fn to_i8(&self) -> Option<i8> { impl_to_primitive_uint_to_int!(i8, *self) }
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#[inline]
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fn to_i16(&self) -> Option<i16> { impl_to_primitive_uint_to_int!(i16, *self) }
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#[inline]
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fn to_i32(&self) -> Option<i32> { impl_to_primitive_uint_to_int!(i32, *self) }
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#[inline]
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fn to_i64(&self) -> Option<i64> { impl_to_primitive_uint_to_int!(i64, *self) }
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#[inline]
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fn to_usize(&self) -> Option<usize> {
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impl_to_primitive_uint_to_uint!($T, usize, *self)
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}
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#[inline]
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fn to_u8(&self) -> Option<u8> { impl_to_primitive_uint_to_uint!($T, u8, *self) }
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#[inline]
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fn to_u16(&self) -> Option<u16> { impl_to_primitive_uint_to_uint!($T, u16, *self) }
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#[inline]
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fn to_u32(&self) -> Option<u32> { impl_to_primitive_uint_to_uint!($T, u32, *self) }
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#[inline]
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fn to_u64(&self) -> Option<u64> { impl_to_primitive_uint_to_uint!($T, u64, *self) }
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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, $DstT:ident, $slf:expr) => (
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if size_of::<$SrcT>() <= size_of::<$DstT>() {
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Some($slf as $DstT)
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} else {
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let n = $slf as f64;
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let max_value: $SrcT = ::std::$SrcT::MAX;
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if -max_value as f64 <= n && n <= max_value as f64 {
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Some($slf as $DstT)
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} else {
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None
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}
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}
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)
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}
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macro_rules! impl_to_primitive_float {
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($T:ident) => (
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impl ToPrimitive for $T {
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#[inline]
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fn to_isize(&self) -> Option<isize> { Some(*self as isize) }
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#[inline]
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fn to_i8(&self) -> Option<i8> { Some(*self as i8) }
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#[inline]
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fn to_i16(&self) -> Option<i16> { Some(*self as i16) }
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#[inline]
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fn to_i32(&self) -> Option<i32> { Some(*self as i32) }
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#[inline]
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fn to_i64(&self) -> Option<i64> { Some(*self as i64) }
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#[inline]
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fn to_usize(&self) -> Option<usize> { Some(*self as usize) }
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#[inline]
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fn to_u8(&self) -> Option<u8> { Some(*self as u8) }
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#[inline]
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fn to_u16(&self) -> Option<u16> { Some(*self as u16) }
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#[inline]
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fn to_u32(&self) -> Option<u32> { Some(*self as u32) }
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#[inline]
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fn to_u64(&self) -> Option<u64> { Some(*self as u64) }
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#[inline]
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fn to_f32(&self) -> Option<f32> { impl_to_primitive_float_to_float!($T, f32, *self) }
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#[inline]
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fn to_f64(&self) -> Option<f64> { impl_to_primitive_float_to_float!($T, f64, *self) }
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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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/// 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);
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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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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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