1 use super::{From, TryFrom};
2 use crate::num::TryFromIntError;
5 /// This trait being unreachable from outside the crate
6 /// prevents other implementations of the `FloatToInt` trait,
7 /// which allows potentially adding more trait methods after the trait is `#[stable]`.
8 #[unstable(feature = "convert_float_to_int", issue = "67057")]
12 /// Supporting trait for inherent methods of `f32` and `f64` such as `to_int_unchecked`.
13 /// Typically doesn’t need to be used directly.
14 #[unstable(feature = "convert_float_to_int", issue = "67057")]
15 pub trait FloatToInt<Int>: private::Sealed + Sized {
16 #[unstable(feature = "convert_float_to_int", issue = "67057")]
18 unsafe fn to_int_unchecked(self) -> Int;
21 macro_rules! impl_float_to_int {
22 ( $Float: ident => $( $Int: ident )+ ) => {
23 #[unstable(feature = "convert_float_to_int", issue = "67057")]
24 impl private::Sealed for $Float {}
26 #[unstable(feature = "convert_float_to_int", issue = "67057")]
27 impl FloatToInt<$Int> for $Float {
30 unsafe fn to_int_unchecked(self) -> $Int {
31 // SAFETY: the safety contract must be upheld by the caller.
32 unsafe { crate::intrinsics::float_to_int_unchecked(self) }
39 impl_float_to_int!(f32 => u8 u16 u32 u64 u128 usize i8 i16 i32 i64 i128 isize);
40 impl_float_to_int!(f64 => u8 u16 u32 u64 u128 usize i8 i16 i32 i64 i128 isize);
42 // Conversion traits for primitive integer and float types
43 // Conversions T -> T are covered by a blanket impl and therefore excluded
44 // Some conversions from and to usize/isize are not implemented due to portability concerns
45 macro_rules! impl_from {
46 ($Small: ty, $Large: ty, #[$attr:meta], $doc: expr) => {
48 #[rustc_const_unstable(feature = "const_num_from_num", issue = "87852")]
49 impl const From<$Small> for $Large {
50 // Rustdocs on the impl block show a "[+] show undocumented items" toggle.
51 // Rustdocs on functions do not.
54 fn from(small: $Small) -> Self {
59 ($Small: ty, $Large: ty, #[$attr:meta]) => {
71 macro_rules! impl_from_bool {
72 ($target: ty, #[$attr:meta]) => {
73 impl_from!(bool, $target, #[$attr], concat!("Converts a `bool` to a `",
74 stringify!($target), "`. The resulting value is `0` for `false` and `1` for `true`
80 assert_eq!(", stringify!($target), "::from(true), 1);
81 assert_eq!(", stringify!($target), "::from(false), 0);
87 impl_from_bool! { u8, #[stable(feature = "from_bool", since = "1.28.0")] }
88 impl_from_bool! { u16, #[stable(feature = "from_bool", since = "1.28.0")] }
89 impl_from_bool! { u32, #[stable(feature = "from_bool", since = "1.28.0")] }
90 impl_from_bool! { u64, #[stable(feature = "from_bool", since = "1.28.0")] }
91 impl_from_bool! { u128, #[stable(feature = "from_bool", since = "1.28.0")] }
92 impl_from_bool! { usize, #[stable(feature = "from_bool", since = "1.28.0")] }
93 impl_from_bool! { i8, #[stable(feature = "from_bool", since = "1.28.0")] }
94 impl_from_bool! { i16, #[stable(feature = "from_bool", since = "1.28.0")] }
95 impl_from_bool! { i32, #[stable(feature = "from_bool", since = "1.28.0")] }
96 impl_from_bool! { i64, #[stable(feature = "from_bool", since = "1.28.0")] }
97 impl_from_bool! { i128, #[stable(feature = "from_bool", since = "1.28.0")] }
98 impl_from_bool! { isize, #[stable(feature = "from_bool", since = "1.28.0")] }
100 // Unsigned -> Unsigned
101 impl_from! { u8, u16, #[stable(feature = "lossless_int_conv", since = "1.5.0")] }
102 impl_from! { u8, u32, #[stable(feature = "lossless_int_conv", since = "1.5.0")] }
103 impl_from! { u8, u64, #[stable(feature = "lossless_int_conv", since = "1.5.0")] }
104 impl_from! { u8, u128, #[stable(feature = "i128", since = "1.26.0")] }
105 impl_from! { u8, usize, #[stable(feature = "lossless_int_conv", since = "1.5.0")] }
106 impl_from! { u16, u32, #[stable(feature = "lossless_int_conv", since = "1.5.0")] }
107 impl_from! { u16, u64, #[stable(feature = "lossless_int_conv", since = "1.5.0")] }
108 impl_from! { u16, u128, #[stable(feature = "i128", since = "1.26.0")] }
109 impl_from! { u32, u64, #[stable(feature = "lossless_int_conv", since = "1.5.0")] }
110 impl_from! { u32, u128, #[stable(feature = "i128", since = "1.26.0")] }
111 impl_from! { u64, u128, #[stable(feature = "i128", since = "1.26.0")] }
114 impl_from! { i8, i16, #[stable(feature = "lossless_int_conv", since = "1.5.0")] }
115 impl_from! { i8, i32, #[stable(feature = "lossless_int_conv", since = "1.5.0")] }
116 impl_from! { i8, i64, #[stable(feature = "lossless_int_conv", since = "1.5.0")] }
117 impl_from! { i8, i128, #[stable(feature = "i128", since = "1.26.0")] }
118 impl_from! { i8, isize, #[stable(feature = "lossless_int_conv", since = "1.5.0")] }
119 impl_from! { i16, i32, #[stable(feature = "lossless_int_conv", since = "1.5.0")] }
120 impl_from! { i16, i64, #[stable(feature = "lossless_int_conv", since = "1.5.0")] }
121 impl_from! { i16, i128, #[stable(feature = "i128", since = "1.26.0")] }
122 impl_from! { i32, i64, #[stable(feature = "lossless_int_conv", since = "1.5.0")] }
123 impl_from! { i32, i128, #[stable(feature = "i128", since = "1.26.0")] }
124 impl_from! { i64, i128, #[stable(feature = "i128", since = "1.26.0")] }
126 // Unsigned -> Signed
127 impl_from! { u8, i16, #[stable(feature = "lossless_int_conv", since = "1.5.0")] }
128 impl_from! { u8, i32, #[stable(feature = "lossless_int_conv", since = "1.5.0")] }
129 impl_from! { u8, i64, #[stable(feature = "lossless_int_conv", since = "1.5.0")] }
130 impl_from! { u8, i128, #[stable(feature = "i128", since = "1.26.0")] }
131 impl_from! { u16, i32, #[stable(feature = "lossless_int_conv", since = "1.5.0")] }
132 impl_from! { u16, i64, #[stable(feature = "lossless_int_conv", since = "1.5.0")] }
133 impl_from! { u16, i128, #[stable(feature = "i128", since = "1.26.0")] }
134 impl_from! { u32, i64, #[stable(feature = "lossless_int_conv", since = "1.5.0")] }
135 impl_from! { u32, i128, #[stable(feature = "i128", since = "1.26.0")] }
136 impl_from! { u64, i128, #[stable(feature = "i128", since = "1.26.0")] }
138 // The C99 standard defines bounds on INTPTR_MIN, INTPTR_MAX, and UINTPTR_MAX
139 // which imply that pointer-sized integers must be at least 16 bits:
140 // https://port70.net/~nsz/c/c99/n1256.html#7.18.2.4
141 impl_from! { u16, usize, #[stable(feature = "lossless_iusize_conv", since = "1.26.0")] }
142 impl_from! { u8, isize, #[stable(feature = "lossless_iusize_conv", since = "1.26.0")] }
143 impl_from! { i16, isize, #[stable(feature = "lossless_iusize_conv", since = "1.26.0")] }
145 // RISC-V defines the possibility of a 128-bit address space (RV128).
147 // CHERI proposes 256-bit “capabilities”. Unclear if this would be relevant to usize/isize.
148 // https://www.cl.cam.ac.uk/research/security/ctsrd/pdfs/20171017a-cheri-poster.pdf
149 // https://www.csl.sri.com/users/neumann/2012resolve-cheri.pdf
151 // Note: integers can only be represented with full precision in a float if
152 // they fit in the significand, which is 24 bits in f32 and 53 bits in f64.
153 // Lossy float conversions are not implemented at this time.
156 impl_from! { i8, f32, #[stable(feature = "lossless_float_conv", since = "1.6.0")] }
157 impl_from! { i8, f64, #[stable(feature = "lossless_float_conv", since = "1.6.0")] }
158 impl_from! { i16, f32, #[stable(feature = "lossless_float_conv", since = "1.6.0")] }
159 impl_from! { i16, f64, #[stable(feature = "lossless_float_conv", since = "1.6.0")] }
160 impl_from! { i32, f64, #[stable(feature = "lossless_float_conv", since = "1.6.0")] }
163 impl_from! { u8, f32, #[stable(feature = "lossless_float_conv", since = "1.6.0")] }
164 impl_from! { u8, f64, #[stable(feature = "lossless_float_conv", since = "1.6.0")] }
165 impl_from! { u16, f32, #[stable(feature = "lossless_float_conv", since = "1.6.0")] }
166 impl_from! { u16, f64, #[stable(feature = "lossless_float_conv", since = "1.6.0")] }
167 impl_from! { u32, f64, #[stable(feature = "lossless_float_conv", since = "1.6.0")] }
170 impl_from! { f32, f64, #[stable(feature = "lossless_float_conv", since = "1.6.0")] }
172 // no possible bounds violation
173 macro_rules! try_from_unbounded {
174 ($source:ty, $($target:ty),*) => {$(
175 #[stable(feature = "try_from", since = "1.34.0")]
176 #[rustc_const_unstable(feature = "const_num_from_num", issue = "87852")]
177 impl const TryFrom<$source> for $target {
178 type Error = TryFromIntError;
180 /// Try to create the target number type from a source
181 /// number type. This returns an error if the source value
182 /// is outside of the range of the target type.
184 fn try_from(value: $source) -> Result<Self, Self::Error> {
191 // only negative bounds
192 macro_rules! try_from_lower_bounded {
193 ($source:ty, $($target:ty),*) => {$(
194 #[stable(feature = "try_from", since = "1.34.0")]
195 #[rustc_const_unstable(feature = "const_num_from_num", issue = "87852")]
196 impl const TryFrom<$source> for $target {
197 type Error = TryFromIntError;
199 /// Try to create the target number type from a source
200 /// number type. This returns an error if the source value
201 /// is outside of the range of the target type.
203 fn try_from(u: $source) -> Result<Self, Self::Error> {
207 Err(TryFromIntError(()))
214 // unsigned to signed (only positive bound)
215 macro_rules! try_from_upper_bounded {
216 ($source:ty, $($target:ty),*) => {$(
217 #[stable(feature = "try_from", since = "1.34.0")]
218 #[rustc_const_unstable(feature = "const_num_from_num", issue = "87852")]
219 impl const TryFrom<$source> for $target {
220 type Error = TryFromIntError;
222 /// Try to create the target number type from a source
223 /// number type. This returns an error if the source value
224 /// is outside of the range of the target type.
226 fn try_from(u: $source) -> Result<Self, Self::Error> {
227 if u > (Self::MAX as $source) {
228 Err(TryFromIntError(()))
238 macro_rules! try_from_both_bounded {
239 ($source:ty, $($target:ty),*) => {$(
240 #[stable(feature = "try_from", since = "1.34.0")]
241 #[rustc_const_unstable(feature = "const_num_from_num", issue = "87852")]
242 impl const TryFrom<$source> for $target {
243 type Error = TryFromIntError;
245 /// Try to create the target number type from a source
246 /// number type. This returns an error if the source value
247 /// is outside of the range of the target type.
249 fn try_from(u: $source) -> Result<Self, Self::Error> {
250 let min = Self::MIN as $source;
251 let max = Self::MAX as $source;
252 if u < min || u > max {
253 Err(TryFromIntError(()))
263 ($mac:ident, $source:ty, $($target:ty),*) => {$(
264 $mac!($target, $source);
268 // intra-sign conversions
269 try_from_upper_bounded!(u16, u8);
270 try_from_upper_bounded!(u32, u16, u8);
271 try_from_upper_bounded!(u64, u32, u16, u8);
272 try_from_upper_bounded!(u128, u64, u32, u16, u8);
274 try_from_both_bounded!(i16, i8);
275 try_from_both_bounded!(i32, i16, i8);
276 try_from_both_bounded!(i64, i32, i16, i8);
277 try_from_both_bounded!(i128, i64, i32, i16, i8);
279 // unsigned-to-signed
280 try_from_upper_bounded!(u8, i8);
281 try_from_upper_bounded!(u16, i8, i16);
282 try_from_upper_bounded!(u32, i8, i16, i32);
283 try_from_upper_bounded!(u64, i8, i16, i32, i64);
284 try_from_upper_bounded!(u128, i8, i16, i32, i64, i128);
286 // signed-to-unsigned
287 try_from_lower_bounded!(i8, u8, u16, u32, u64, u128);
288 try_from_lower_bounded!(i16, u16, u32, u64, u128);
289 try_from_lower_bounded!(i32, u32, u64, u128);
290 try_from_lower_bounded!(i64, u64, u128);
291 try_from_lower_bounded!(i128, u128);
292 try_from_both_bounded!(i16, u8);
293 try_from_both_bounded!(i32, u16, u8);
294 try_from_both_bounded!(i64, u32, u16, u8);
295 try_from_both_bounded!(i128, u64, u32, u16, u8);
298 try_from_upper_bounded!(usize, isize);
299 try_from_lower_bounded!(isize, usize);
301 #[cfg(target_pointer_width = "16")]
302 mod ptr_try_from_impls {
303 use super::TryFromIntError;
304 use crate::convert::TryFrom;
306 try_from_upper_bounded!(usize, u8);
307 try_from_unbounded!(usize, u16, u32, u64, u128);
308 try_from_upper_bounded!(usize, i8, i16);
309 try_from_unbounded!(usize, i32, i64, i128);
311 try_from_both_bounded!(isize, u8);
312 try_from_lower_bounded!(isize, u16, u32, u64, u128);
313 try_from_both_bounded!(isize, i8);
314 try_from_unbounded!(isize, i16, i32, i64, i128);
316 rev!(try_from_upper_bounded, usize, u32, u64, u128);
317 rev!(try_from_lower_bounded, usize, i8, i16);
318 rev!(try_from_both_bounded, usize, i32, i64, i128);
320 rev!(try_from_upper_bounded, isize, u16, u32, u64, u128);
321 rev!(try_from_both_bounded, isize, i32, i64, i128);
324 #[cfg(target_pointer_width = "32")]
325 mod ptr_try_from_impls {
326 use super::TryFromIntError;
327 use crate::convert::TryFrom;
329 try_from_upper_bounded!(usize, u8, u16);
330 try_from_unbounded!(usize, u32, u64, u128);
331 try_from_upper_bounded!(usize, i8, i16, i32);
332 try_from_unbounded!(usize, i64, i128);
334 try_from_both_bounded!(isize, u8, u16);
335 try_from_lower_bounded!(isize, u32, u64, u128);
336 try_from_both_bounded!(isize, i8, i16);
337 try_from_unbounded!(isize, i32, i64, i128);
339 rev!(try_from_unbounded, usize, u32);
340 rev!(try_from_upper_bounded, usize, u64, u128);
341 rev!(try_from_lower_bounded, usize, i8, i16, i32);
342 rev!(try_from_both_bounded, usize, i64, i128);
344 rev!(try_from_unbounded, isize, u16);
345 rev!(try_from_upper_bounded, isize, u32, u64, u128);
346 rev!(try_from_unbounded, isize, i32);
347 rev!(try_from_both_bounded, isize, i64, i128);
350 #[cfg(target_pointer_width = "64")]
351 mod ptr_try_from_impls {
352 use super::TryFromIntError;
353 use crate::convert::TryFrom;
355 try_from_upper_bounded!(usize, u8, u16, u32);
356 try_from_unbounded!(usize, u64, u128);
357 try_from_upper_bounded!(usize, i8, i16, i32, i64);
358 try_from_unbounded!(usize, i128);
360 try_from_both_bounded!(isize, u8, u16, u32);
361 try_from_lower_bounded!(isize, u64, u128);
362 try_from_both_bounded!(isize, i8, i16, i32);
363 try_from_unbounded!(isize, i64, i128);
365 rev!(try_from_unbounded, usize, u32, u64);
366 rev!(try_from_upper_bounded, usize, u128);
367 rev!(try_from_lower_bounded, usize, i8, i16, i32, i64);
368 rev!(try_from_both_bounded, usize, i128);
370 rev!(try_from_unbounded, isize, u16, u32);
371 rev!(try_from_upper_bounded, isize, u64, u128);
372 rev!(try_from_unbounded, isize, i32, i64);
373 rev!(try_from_both_bounded, isize, i128);
376 // Conversion traits for non-zero integer types
377 use crate::num::NonZeroI128;
378 use crate::num::NonZeroI16;
379 use crate::num::NonZeroI32;
380 use crate::num::NonZeroI64;
381 use crate::num::NonZeroI8;
382 use crate::num::NonZeroIsize;
383 use crate::num::NonZeroU128;
384 use crate::num::NonZeroU16;
385 use crate::num::NonZeroU32;
386 use crate::num::NonZeroU64;
387 use crate::num::NonZeroU8;
388 use crate::num::NonZeroUsize;
390 macro_rules! nzint_impl_from {
391 ($Small: ty, $Large: ty, #[$attr:meta], $doc: expr) => {
393 #[rustc_const_unstable(feature = "const_num_from_num", issue = "87852")]
394 impl const From<$Small> for $Large {
395 // Rustdocs on the impl block show a "[+] show undocumented items" toggle.
396 // Rustdocs on functions do not.
399 fn from(small: $Small) -> Self {
400 // SAFETY: input type guarantees the value is non-zero
402 Self::new_unchecked(From::from(small.get()))
407 ($Small: ty, $Large: ty, #[$attr:meta]) => {
408 nzint_impl_from!($Small,
411 concat!("Converts `",
419 // Non-zero Unsigned -> Non-zero Unsigned
420 nzint_impl_from! { NonZeroU8, NonZeroU16, #[stable(feature = "nz_int_conv", since = "1.41.0")] }
421 nzint_impl_from! { NonZeroU8, NonZeroU32, #[stable(feature = "nz_int_conv", since = "1.41.0")] }
422 nzint_impl_from! { NonZeroU8, NonZeroU64, #[stable(feature = "nz_int_conv", since = "1.41.0")] }
423 nzint_impl_from! { NonZeroU8, NonZeroU128, #[stable(feature = "nz_int_conv", since = "1.41.0")] }
424 nzint_impl_from! { NonZeroU8, NonZeroUsize, #[stable(feature = "nz_int_conv", since = "1.41.0")] }
425 nzint_impl_from! { NonZeroU16, NonZeroU32, #[stable(feature = "nz_int_conv", since = "1.41.0")] }
426 nzint_impl_from! { NonZeroU16, NonZeroU64, #[stable(feature = "nz_int_conv", since = "1.41.0")] }
427 nzint_impl_from! { NonZeroU16, NonZeroU128, #[stable(feature = "nz_int_conv", since = "1.41.0")] }
428 nzint_impl_from! { NonZeroU16, NonZeroUsize, #[stable(feature = "nz_int_conv", since = "1.41.0")] }
429 nzint_impl_from! { NonZeroU32, NonZeroU64, #[stable(feature = "nz_int_conv", since = "1.41.0")] }
430 nzint_impl_from! { NonZeroU32, NonZeroU128, #[stable(feature = "nz_int_conv", since = "1.41.0")] }
431 nzint_impl_from! { NonZeroU64, NonZeroU128, #[stable(feature = "nz_int_conv", since = "1.41.0")] }
433 // Non-zero Signed -> Non-zero Signed
434 nzint_impl_from! { NonZeroI8, NonZeroI16, #[stable(feature = "nz_int_conv", since = "1.41.0")] }
435 nzint_impl_from! { NonZeroI8, NonZeroI32, #[stable(feature = "nz_int_conv", since = "1.41.0")] }
436 nzint_impl_from! { NonZeroI8, NonZeroI64, #[stable(feature = "nz_int_conv", since = "1.41.0")] }
437 nzint_impl_from! { NonZeroI8, NonZeroI128, #[stable(feature = "nz_int_conv", since = "1.41.0")] }
438 nzint_impl_from! { NonZeroI8, NonZeroIsize, #[stable(feature = "nz_int_conv", since = "1.41.0")] }
439 nzint_impl_from! { NonZeroI16, NonZeroI32, #[stable(feature = "nz_int_conv", since = "1.41.0")] }
440 nzint_impl_from! { NonZeroI16, NonZeroI64, #[stable(feature = "nz_int_conv", since = "1.41.0")] }
441 nzint_impl_from! { NonZeroI16, NonZeroI128, #[stable(feature = "nz_int_conv", since = "1.41.0")] }
442 nzint_impl_from! { NonZeroI16, NonZeroIsize, #[stable(feature = "nz_int_conv", since = "1.41.0")] }
443 nzint_impl_from! { NonZeroI32, NonZeroI64, #[stable(feature = "nz_int_conv", since = "1.41.0")] }
444 nzint_impl_from! { NonZeroI32, NonZeroI128, #[stable(feature = "nz_int_conv", since = "1.41.0")] }
445 nzint_impl_from! { NonZeroI64, NonZeroI128, #[stable(feature = "nz_int_conv", since = "1.41.0")] }
447 // NonZero UnSigned -> Non-zero Signed
448 nzint_impl_from! { NonZeroU8, NonZeroI16, #[stable(feature = "nz_int_conv", since = "1.41.0")] }
449 nzint_impl_from! { NonZeroU8, NonZeroI32, #[stable(feature = "nz_int_conv", since = "1.41.0")] }
450 nzint_impl_from! { NonZeroU8, NonZeroI64, #[stable(feature = "nz_int_conv", since = "1.41.0")] }
451 nzint_impl_from! { NonZeroU8, NonZeroI128, #[stable(feature = "nz_int_conv", since = "1.41.0")] }
452 nzint_impl_from! { NonZeroU8, NonZeroIsize, #[stable(feature = "nz_int_conv", since = "1.41.0")] }
453 nzint_impl_from! { NonZeroU16, NonZeroI32, #[stable(feature = "nz_int_conv", since = "1.41.0")] }
454 nzint_impl_from! { NonZeroU16, NonZeroI64, #[stable(feature = "nz_int_conv", since = "1.41.0")] }
455 nzint_impl_from! { NonZeroU16, NonZeroI128, #[stable(feature = "nz_int_conv", since = "1.41.0")] }
456 nzint_impl_from! { NonZeroU32, NonZeroI64, #[stable(feature = "nz_int_conv", since = "1.41.0")] }
457 nzint_impl_from! { NonZeroU32, NonZeroI128, #[stable(feature = "nz_int_conv", since = "1.41.0")] }
458 nzint_impl_from! { NonZeroU64, NonZeroI128, #[stable(feature = "nz_int_conv", since = "1.41.0")] }
460 macro_rules! nzint_impl_try_from_int {
461 ($Int: ty, $NonZeroInt: ty, #[$attr:meta], $doc: expr) => {
463 impl TryFrom<$Int> for $NonZeroInt {
464 type Error = TryFromIntError;
466 // Rustdocs on the impl block show a "[+] show undocumented items" toggle.
467 // Rustdocs on functions do not.
470 fn try_from(value: $Int) -> Result<Self, Self::Error> {
471 Self::new(value).ok_or(TryFromIntError(()))
475 ($Int: ty, $NonZeroInt: ty, #[$attr:meta]) => {
476 nzint_impl_try_from_int!($Int,
479 concat!("Attempts to convert `",
482 stringify!($NonZeroInt),
487 // Int -> Non-zero Int
488 nzint_impl_try_from_int! { u8, NonZeroU8, #[stable(feature = "nzint_try_from_int_conv", since = "1.46.0")] }
489 nzint_impl_try_from_int! { u16, NonZeroU16, #[stable(feature = "nzint_try_from_int_conv", since = "1.46.0")] }
490 nzint_impl_try_from_int! { u32, NonZeroU32, #[stable(feature = "nzint_try_from_int_conv", since = "1.46.0")] }
491 nzint_impl_try_from_int! { u64, NonZeroU64, #[stable(feature = "nzint_try_from_int_conv", since = "1.46.0")] }
492 nzint_impl_try_from_int! { u128, NonZeroU128, #[stable(feature = "nzint_try_from_int_conv", since = "1.46.0")] }
493 nzint_impl_try_from_int! { usize, NonZeroUsize, #[stable(feature = "nzint_try_from_int_conv", since = "1.46.0")] }
494 nzint_impl_try_from_int! { i8, NonZeroI8, #[stable(feature = "nzint_try_from_int_conv", since = "1.46.0")] }
495 nzint_impl_try_from_int! { i16, NonZeroI16, #[stable(feature = "nzint_try_from_int_conv", since = "1.46.0")] }
496 nzint_impl_try_from_int! { i32, NonZeroI32, #[stable(feature = "nzint_try_from_int_conv", since = "1.46.0")] }
497 nzint_impl_try_from_int! { i64, NonZeroI64, #[stable(feature = "nzint_try_from_int_conv", since = "1.46.0")] }
498 nzint_impl_try_from_int! { i128, NonZeroI128, #[stable(feature = "nzint_try_from_int_conv", since = "1.46.0")] }
499 nzint_impl_try_from_int! { isize, NonZeroIsize, #[stable(feature = "nzint_try_from_int_conv", since = "1.46.0")] }
501 macro_rules! nzint_impl_try_from_nzint {
502 ($From:ty => $To:ty, $doc: expr) => {
503 #[stable(feature = "nzint_try_from_nzint_conv", since = "1.49.0")]
504 impl TryFrom<$From> for $To {
505 type Error = TryFromIntError;
507 // Rustdocs on the impl block show a "[+] show undocumented items" toggle.
508 // Rustdocs on functions do not.
511 fn try_from(value: $From) -> Result<Self, Self::Error> {
512 TryFrom::try_from(value.get()).map(|v| {
513 // SAFETY: $From is a NonZero type, so v is not zero.
514 unsafe { Self::new_unchecked(v) }
519 ($To:ty: $($From: ty),*) => {$(
520 nzint_impl_try_from_nzint!(
523 "Attempts to convert `",
533 // Non-zero int -> non-zero unsigned int
534 nzint_impl_try_from_nzint! { NonZeroU8: NonZeroI8, NonZeroU16, NonZeroI16, NonZeroU32, NonZeroI32, NonZeroU64, NonZeroI64, NonZeroU128, NonZeroI128, NonZeroUsize, NonZeroIsize }
535 nzint_impl_try_from_nzint! { NonZeroU16: NonZeroI8, NonZeroI16, NonZeroU32, NonZeroI32, NonZeroU64, NonZeroI64, NonZeroU128, NonZeroI128, NonZeroUsize, NonZeroIsize }
536 nzint_impl_try_from_nzint! { NonZeroU32: NonZeroI8, NonZeroI16, NonZeroI32, NonZeroU64, NonZeroI64, NonZeroU128, NonZeroI128, NonZeroUsize, NonZeroIsize }
537 nzint_impl_try_from_nzint! { NonZeroU64: NonZeroI8, NonZeroI16, NonZeroI32, NonZeroI64, NonZeroU128, NonZeroI128, NonZeroUsize, NonZeroIsize }
538 nzint_impl_try_from_nzint! { NonZeroU128: NonZeroI8, NonZeroI16, NonZeroI32, NonZeroI64, NonZeroI128, NonZeroUsize, NonZeroIsize }
539 nzint_impl_try_from_nzint! { NonZeroUsize: NonZeroI8, NonZeroI16, NonZeroU32, NonZeroI32, NonZeroU64, NonZeroI64, NonZeroU128, NonZeroI128, NonZeroIsize }
541 // Non-zero int -> non-zero signed int
542 nzint_impl_try_from_nzint! { NonZeroI8: NonZeroU8, NonZeroU16, NonZeroI16, NonZeroU32, NonZeroI32, NonZeroU64, NonZeroI64, NonZeroU128, NonZeroI128, NonZeroUsize, NonZeroIsize }
543 nzint_impl_try_from_nzint! { NonZeroI16: NonZeroU16, NonZeroU32, NonZeroI32, NonZeroU64, NonZeroI64, NonZeroU128, NonZeroI128, NonZeroUsize, NonZeroIsize }
544 nzint_impl_try_from_nzint! { NonZeroI32: NonZeroU32, NonZeroU64, NonZeroI64, NonZeroU128, NonZeroI128, NonZeroUsize, NonZeroIsize }
545 nzint_impl_try_from_nzint! { NonZeroI64: NonZeroU64, NonZeroU128, NonZeroI128, NonZeroUsize, NonZeroIsize }
546 nzint_impl_try_from_nzint! { NonZeroI128: NonZeroU128, NonZeroUsize, NonZeroIsize }
547 nzint_impl_try_from_nzint! { NonZeroIsize: NonZeroU16, NonZeroU32, NonZeroI32, NonZeroU64, NonZeroI64, NonZeroU128, NonZeroI128, NonZeroUsize }