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 {
29 unsafe fn to_int_unchecked(self) -> $Int {
30 // SAFETY: the safety contract must be upheld by the caller.
31 unsafe { crate::intrinsics::float_to_int_unchecked(self) }
38 impl_float_to_int!(f32 => u8 u16 u32 u64 u128 usize i8 i16 i32 i64 i128 isize);
39 impl_float_to_int!(f64 => u8 u16 u32 u64 u128 usize i8 i16 i32 i64 i128 isize);
41 // Conversion traits for primitive integer and float types
42 // Conversions T -> T are covered by a blanket impl and therefore excluded
43 // Some conversions from and to usize/isize are not implemented due to portability concerns
44 macro_rules! impl_from {
45 ($Small: ty, $Large: ty, #[$attr:meta], $doc: expr) => {
47 #[rustc_const_unstable(feature = "const_num_from_num", issue = "87852")]
48 impl const From<$Small> for $Large {
49 // Rustdocs on the impl block show a "[+] show undocumented items" toggle.
50 // Rustdocs on functions do not.
53 fn from(small: $Small) -> Self {
58 ($Small: ty, $Large: ty, #[$attr:meta]) => {
70 macro_rules! impl_from_bool {
71 ($target: ty, #[$attr:meta]) => {
72 impl_from!(bool, $target, #[$attr], concat!("Converts a `bool` to a `",
73 stringify!($target), "`. The resulting value is `0` for `false` and `1` for `true`
79 assert_eq!(", stringify!($target), "::from(true), 1);
80 assert_eq!(", stringify!($target), "::from(false), 0);
86 impl_from_bool! { u8, #[stable(feature = "from_bool", since = "1.28.0")] }
87 impl_from_bool! { u16, #[stable(feature = "from_bool", since = "1.28.0")] }
88 impl_from_bool! { u32, #[stable(feature = "from_bool", since = "1.28.0")] }
89 impl_from_bool! { u64, #[stable(feature = "from_bool", since = "1.28.0")] }
90 impl_from_bool! { u128, #[stable(feature = "from_bool", since = "1.28.0")] }
91 impl_from_bool! { usize, #[stable(feature = "from_bool", since = "1.28.0")] }
92 impl_from_bool! { i8, #[stable(feature = "from_bool", since = "1.28.0")] }
93 impl_from_bool! { i16, #[stable(feature = "from_bool", since = "1.28.0")] }
94 impl_from_bool! { i32, #[stable(feature = "from_bool", since = "1.28.0")] }
95 impl_from_bool! { i64, #[stable(feature = "from_bool", since = "1.28.0")] }
96 impl_from_bool! { i128, #[stable(feature = "from_bool", since = "1.28.0")] }
97 impl_from_bool! { isize, #[stable(feature = "from_bool", since = "1.28.0")] }
99 // Unsigned -> Unsigned
100 impl_from! { u8, u16, #[stable(feature = "lossless_int_conv", since = "1.5.0")] }
101 impl_from! { u8, u32, #[stable(feature = "lossless_int_conv", since = "1.5.0")] }
102 impl_from! { u8, u64, #[stable(feature = "lossless_int_conv", since = "1.5.0")] }
103 impl_from! { u8, u128, #[stable(feature = "i128", since = "1.26.0")] }
104 impl_from! { u8, usize, #[stable(feature = "lossless_int_conv", since = "1.5.0")] }
105 impl_from! { u16, u32, #[stable(feature = "lossless_int_conv", since = "1.5.0")] }
106 impl_from! { u16, u64, #[stable(feature = "lossless_int_conv", since = "1.5.0")] }
107 impl_from! { u16, u128, #[stable(feature = "i128", since = "1.26.0")] }
108 impl_from! { u32, u64, #[stable(feature = "lossless_int_conv", since = "1.5.0")] }
109 impl_from! { u32, u128, #[stable(feature = "i128", since = "1.26.0")] }
110 impl_from! { u64, u128, #[stable(feature = "i128", since = "1.26.0")] }
113 impl_from! { i8, i16, #[stable(feature = "lossless_int_conv", since = "1.5.0")] }
114 impl_from! { i8, i32, #[stable(feature = "lossless_int_conv", since = "1.5.0")] }
115 impl_from! { i8, i64, #[stable(feature = "lossless_int_conv", since = "1.5.0")] }
116 impl_from! { i8, i128, #[stable(feature = "i128", since = "1.26.0")] }
117 impl_from! { i8, isize, #[stable(feature = "lossless_int_conv", since = "1.5.0")] }
118 impl_from! { i16, i32, #[stable(feature = "lossless_int_conv", since = "1.5.0")] }
119 impl_from! { i16, i64, #[stable(feature = "lossless_int_conv", since = "1.5.0")] }
120 impl_from! { i16, i128, #[stable(feature = "i128", since = "1.26.0")] }
121 impl_from! { i32, i64, #[stable(feature = "lossless_int_conv", since = "1.5.0")] }
122 impl_from! { i32, i128, #[stable(feature = "i128", since = "1.26.0")] }
123 impl_from! { i64, i128, #[stable(feature = "i128", since = "1.26.0")] }
125 // Unsigned -> Signed
126 impl_from! { u8, i16, #[stable(feature = "lossless_int_conv", since = "1.5.0")] }
127 impl_from! { u8, i32, #[stable(feature = "lossless_int_conv", since = "1.5.0")] }
128 impl_from! { u8, i64, #[stable(feature = "lossless_int_conv", since = "1.5.0")] }
129 impl_from! { u8, i128, #[stable(feature = "i128", since = "1.26.0")] }
130 impl_from! { u16, i32, #[stable(feature = "lossless_int_conv", since = "1.5.0")] }
131 impl_from! { u16, i64, #[stable(feature = "lossless_int_conv", since = "1.5.0")] }
132 impl_from! { u16, i128, #[stable(feature = "i128", since = "1.26.0")] }
133 impl_from! { u32, i64, #[stable(feature = "lossless_int_conv", since = "1.5.0")] }
134 impl_from! { u32, i128, #[stable(feature = "i128", since = "1.26.0")] }
135 impl_from! { u64, i128, #[stable(feature = "i128", since = "1.26.0")] }
137 // The C99 standard defines bounds on INTPTR_MIN, INTPTR_MAX, and UINTPTR_MAX
138 // which imply that pointer-sized integers must be at least 16 bits:
139 // https://port70.net/~nsz/c/c99/n1256.html#7.18.2.4
140 impl_from! { u16, usize, #[stable(feature = "lossless_iusize_conv", since = "1.26.0")] }
141 impl_from! { u8, isize, #[stable(feature = "lossless_iusize_conv", since = "1.26.0")] }
142 impl_from! { i16, isize, #[stable(feature = "lossless_iusize_conv", since = "1.26.0")] }
144 // RISC-V defines the possibility of a 128-bit address space (RV128).
146 // CHERI proposes 256-bit “capabilities”. Unclear if this would be relevant to usize/isize.
147 // https://www.cl.cam.ac.uk/research/security/ctsrd/pdfs/20171017a-cheri-poster.pdf
148 // https://www.csl.sri.com/users/neumann/2012resolve-cheri.pdf
150 // Note: integers can only be represented with full precision in a float if
151 // they fit in the significand, which is 24 bits in f32 and 53 bits in f64.
152 // Lossy float conversions are not implemented at this time.
155 impl_from! { i8, f32, #[stable(feature = "lossless_float_conv", since = "1.6.0")] }
156 impl_from! { i8, f64, #[stable(feature = "lossless_float_conv", since = "1.6.0")] }
157 impl_from! { i16, f32, #[stable(feature = "lossless_float_conv", since = "1.6.0")] }
158 impl_from! { i16, f64, #[stable(feature = "lossless_float_conv", since = "1.6.0")] }
159 impl_from! { i32, f64, #[stable(feature = "lossless_float_conv", since = "1.6.0")] }
162 impl_from! { u8, f32, #[stable(feature = "lossless_float_conv", since = "1.6.0")] }
163 impl_from! { u8, f64, #[stable(feature = "lossless_float_conv", since = "1.6.0")] }
164 impl_from! { u16, f32, #[stable(feature = "lossless_float_conv", since = "1.6.0")] }
165 impl_from! { u16, f64, #[stable(feature = "lossless_float_conv", since = "1.6.0")] }
166 impl_from! { u32, f64, #[stable(feature = "lossless_float_conv", since = "1.6.0")] }
169 impl_from! { f32, f64, #[stable(feature = "lossless_float_conv", since = "1.6.0")] }
171 // no possible bounds violation
172 macro_rules! try_from_unbounded {
173 ($source:ty, $($target:ty),*) => {$(
174 #[stable(feature = "try_from", since = "1.34.0")]
175 #[rustc_const_unstable(feature = "const_num_from_num", issue = "87852")]
176 impl const TryFrom<$source> for $target {
177 type Error = TryFromIntError;
179 /// Try to create the target number type from a source
180 /// number type. This returns an error if the source value
181 /// is outside of the range of the target type.
183 fn try_from(value: $source) -> Result<Self, Self::Error> {
190 // only negative bounds
191 macro_rules! try_from_lower_bounded {
192 ($source:ty, $($target:ty),*) => {$(
193 #[stable(feature = "try_from", since = "1.34.0")]
194 #[rustc_const_unstable(feature = "const_num_from_num", issue = "87852")]
195 impl const TryFrom<$source> for $target {
196 type Error = TryFromIntError;
198 /// Try to create the target number type from a source
199 /// number type. This returns an error if the source value
200 /// is outside of the range of the target type.
202 fn try_from(u: $source) -> Result<Self, Self::Error> {
206 Err(TryFromIntError(()))
213 // unsigned to signed (only positive bound)
214 macro_rules! try_from_upper_bounded {
215 ($source:ty, $($target:ty),*) => {$(
216 #[stable(feature = "try_from", since = "1.34.0")]
217 #[rustc_const_unstable(feature = "const_num_from_num", issue = "87852")]
218 impl const TryFrom<$source> for $target {
219 type Error = TryFromIntError;
221 /// Try to create the target number type from a source
222 /// number type. This returns an error if the source value
223 /// is outside of the range of the target type.
225 fn try_from(u: $source) -> Result<Self, Self::Error> {
226 if u > (Self::MAX as $source) {
227 Err(TryFromIntError(()))
237 macro_rules! try_from_both_bounded {
238 ($source:ty, $($target:ty),*) => {$(
239 #[stable(feature = "try_from", since = "1.34.0")]
240 #[rustc_const_unstable(feature = "const_num_from_num", issue = "87852")]
241 impl const TryFrom<$source> for $target {
242 type Error = TryFromIntError;
244 /// Try to create the target number type from a source
245 /// number type. This returns an error if the source value
246 /// is outside of the range of the target type.
248 fn try_from(u: $source) -> Result<Self, Self::Error> {
249 let min = Self::MIN as $source;
250 let max = Self::MAX as $source;
251 if u < min || u > max {
252 Err(TryFromIntError(()))
262 ($mac:ident, $source:ty, $($target:ty),*) => {$(
263 $mac!($target, $source);
267 // intra-sign conversions
268 try_from_upper_bounded!(u16, u8);
269 try_from_upper_bounded!(u32, u16, u8);
270 try_from_upper_bounded!(u64, u32, u16, u8);
271 try_from_upper_bounded!(u128, u64, u32, u16, u8);
273 try_from_both_bounded!(i16, i8);
274 try_from_both_bounded!(i32, i16, i8);
275 try_from_both_bounded!(i64, i32, i16, i8);
276 try_from_both_bounded!(i128, i64, i32, i16, i8);
278 // unsigned-to-signed
279 try_from_upper_bounded!(u8, i8);
280 try_from_upper_bounded!(u16, i8, i16);
281 try_from_upper_bounded!(u32, i8, i16, i32);
282 try_from_upper_bounded!(u64, i8, i16, i32, i64);
283 try_from_upper_bounded!(u128, i8, i16, i32, i64, i128);
285 // signed-to-unsigned
286 try_from_lower_bounded!(i8, u8, u16, u32, u64, u128);
287 try_from_lower_bounded!(i16, u16, u32, u64, u128);
288 try_from_lower_bounded!(i32, u32, u64, u128);
289 try_from_lower_bounded!(i64, u64, u128);
290 try_from_lower_bounded!(i128, u128);
291 try_from_both_bounded!(i16, u8);
292 try_from_both_bounded!(i32, u16, u8);
293 try_from_both_bounded!(i64, u32, u16, u8);
294 try_from_both_bounded!(i128, u64, u32, u16, u8);
297 try_from_upper_bounded!(usize, isize);
298 try_from_lower_bounded!(isize, usize);
300 #[cfg(target_pointer_width = "16")]
301 mod ptr_try_from_impls {
302 use super::TryFromIntError;
303 use crate::convert::TryFrom;
305 try_from_upper_bounded!(usize, u8);
306 try_from_unbounded!(usize, u16, u32, u64, u128);
307 try_from_upper_bounded!(usize, i8, i16);
308 try_from_unbounded!(usize, i32, i64, i128);
310 try_from_both_bounded!(isize, u8);
311 try_from_lower_bounded!(isize, u16, u32, u64, u128);
312 try_from_both_bounded!(isize, i8);
313 try_from_unbounded!(isize, i16, i32, i64, i128);
315 rev!(try_from_upper_bounded, usize, u32, u64, u128);
316 rev!(try_from_lower_bounded, usize, i8, i16);
317 rev!(try_from_both_bounded, usize, i32, i64, i128);
319 rev!(try_from_upper_bounded, isize, u16, u32, u64, u128);
320 rev!(try_from_both_bounded, isize, i32, i64, i128);
323 #[cfg(target_pointer_width = "32")]
324 mod ptr_try_from_impls {
325 use super::TryFromIntError;
326 use crate::convert::TryFrom;
328 try_from_upper_bounded!(usize, u8, u16);
329 try_from_unbounded!(usize, u32, u64, u128);
330 try_from_upper_bounded!(usize, i8, i16, i32);
331 try_from_unbounded!(usize, i64, i128);
333 try_from_both_bounded!(isize, u8, u16);
334 try_from_lower_bounded!(isize, u32, u64, u128);
335 try_from_both_bounded!(isize, i8, i16);
336 try_from_unbounded!(isize, i32, i64, i128);
338 rev!(try_from_unbounded, usize, u32);
339 rev!(try_from_upper_bounded, usize, u64, u128);
340 rev!(try_from_lower_bounded, usize, i8, i16, i32);
341 rev!(try_from_both_bounded, usize, i64, i128);
343 rev!(try_from_unbounded, isize, u16);
344 rev!(try_from_upper_bounded, isize, u32, u64, u128);
345 rev!(try_from_unbounded, isize, i32);
346 rev!(try_from_both_bounded, isize, i64, i128);
349 #[cfg(target_pointer_width = "64")]
350 mod ptr_try_from_impls {
351 use super::TryFromIntError;
352 use crate::convert::TryFrom;
354 try_from_upper_bounded!(usize, u8, u16, u32);
355 try_from_unbounded!(usize, u64, u128);
356 try_from_upper_bounded!(usize, i8, i16, i32, i64);
357 try_from_unbounded!(usize, i128);
359 try_from_both_bounded!(isize, u8, u16, u32);
360 try_from_lower_bounded!(isize, u64, u128);
361 try_from_both_bounded!(isize, i8, i16, i32);
362 try_from_unbounded!(isize, i64, i128);
364 rev!(try_from_unbounded, usize, u32, u64);
365 rev!(try_from_upper_bounded, usize, u128);
366 rev!(try_from_lower_bounded, usize, i8, i16, i32, i64);
367 rev!(try_from_both_bounded, usize, i128);
369 rev!(try_from_unbounded, isize, u16, u32);
370 rev!(try_from_upper_bounded, isize, u64, u128);
371 rev!(try_from_unbounded, isize, i32, i64);
372 rev!(try_from_both_bounded, isize, i128);
375 // Conversion traits for non-zero integer types
376 use crate::num::NonZeroI128;
377 use crate::num::NonZeroI16;
378 use crate::num::NonZeroI32;
379 use crate::num::NonZeroI64;
380 use crate::num::NonZeroI8;
381 use crate::num::NonZeroIsize;
382 use crate::num::NonZeroU128;
383 use crate::num::NonZeroU16;
384 use crate::num::NonZeroU32;
385 use crate::num::NonZeroU64;
386 use crate::num::NonZeroU8;
387 use crate::num::NonZeroUsize;
389 macro_rules! nzint_impl_from {
390 ($Small: ty, $Large: ty, #[$attr:meta], $doc: expr) => {
392 #[rustc_const_unstable(feature = "const_num_from_num", issue = "87852")]
393 impl const From<$Small> for $Large {
394 // Rustdocs on the impl block show a "[+] show undocumented items" toggle.
395 // Rustdocs on functions do not.
398 fn from(small: $Small) -> Self {
399 // SAFETY: input type guarantees the value is non-zero
401 Self::new_unchecked(From::from(small.get()))
406 ($Small: ty, $Large: ty, #[$attr:meta]) => {
407 nzint_impl_from!($Small,
410 concat!("Converts `",
418 // Non-zero Unsigned -> Non-zero Unsigned
419 nzint_impl_from! { NonZeroU8, NonZeroU16, #[stable(feature = "nz_int_conv", since = "1.41.0")] }
420 nzint_impl_from! { NonZeroU8, NonZeroU32, #[stable(feature = "nz_int_conv", since = "1.41.0")] }
421 nzint_impl_from! { NonZeroU8, NonZeroU64, #[stable(feature = "nz_int_conv", since = "1.41.0")] }
422 nzint_impl_from! { NonZeroU8, NonZeroU128, #[stable(feature = "nz_int_conv", since = "1.41.0")] }
423 nzint_impl_from! { NonZeroU8, NonZeroUsize, #[stable(feature = "nz_int_conv", since = "1.41.0")] }
424 nzint_impl_from! { NonZeroU16, NonZeroU32, #[stable(feature = "nz_int_conv", since = "1.41.0")] }
425 nzint_impl_from! { NonZeroU16, NonZeroU64, #[stable(feature = "nz_int_conv", since = "1.41.0")] }
426 nzint_impl_from! { NonZeroU16, NonZeroU128, #[stable(feature = "nz_int_conv", since = "1.41.0")] }
427 nzint_impl_from! { NonZeroU16, NonZeroUsize, #[stable(feature = "nz_int_conv", since = "1.41.0")] }
428 nzint_impl_from! { NonZeroU32, NonZeroU64, #[stable(feature = "nz_int_conv", since = "1.41.0")] }
429 nzint_impl_from! { NonZeroU32, NonZeroU128, #[stable(feature = "nz_int_conv", since = "1.41.0")] }
430 nzint_impl_from! { NonZeroU64, NonZeroU128, #[stable(feature = "nz_int_conv", since = "1.41.0")] }
432 // Non-zero Signed -> Non-zero Signed
433 nzint_impl_from! { NonZeroI8, NonZeroI16, #[stable(feature = "nz_int_conv", since = "1.41.0")] }
434 nzint_impl_from! { NonZeroI8, NonZeroI32, #[stable(feature = "nz_int_conv", since = "1.41.0")] }
435 nzint_impl_from! { NonZeroI8, NonZeroI64, #[stable(feature = "nz_int_conv", since = "1.41.0")] }
436 nzint_impl_from! { NonZeroI8, NonZeroI128, #[stable(feature = "nz_int_conv", since = "1.41.0")] }
437 nzint_impl_from! { NonZeroI8, NonZeroIsize, #[stable(feature = "nz_int_conv", since = "1.41.0")] }
438 nzint_impl_from! { NonZeroI16, NonZeroI32, #[stable(feature = "nz_int_conv", since = "1.41.0")] }
439 nzint_impl_from! { NonZeroI16, NonZeroI64, #[stable(feature = "nz_int_conv", since = "1.41.0")] }
440 nzint_impl_from! { NonZeroI16, NonZeroI128, #[stable(feature = "nz_int_conv", since = "1.41.0")] }
441 nzint_impl_from! { NonZeroI16, NonZeroIsize, #[stable(feature = "nz_int_conv", since = "1.41.0")] }
442 nzint_impl_from! { NonZeroI32, NonZeroI64, #[stable(feature = "nz_int_conv", since = "1.41.0")] }
443 nzint_impl_from! { NonZeroI32, NonZeroI128, #[stable(feature = "nz_int_conv", since = "1.41.0")] }
444 nzint_impl_from! { NonZeroI64, NonZeroI128, #[stable(feature = "nz_int_conv", since = "1.41.0")] }
446 // NonZero UnSigned -> Non-zero Signed
447 nzint_impl_from! { NonZeroU8, NonZeroI16, #[stable(feature = "nz_int_conv", since = "1.41.0")] }
448 nzint_impl_from! { NonZeroU8, NonZeroI32, #[stable(feature = "nz_int_conv", since = "1.41.0")] }
449 nzint_impl_from! { NonZeroU8, NonZeroI64, #[stable(feature = "nz_int_conv", since = "1.41.0")] }
450 nzint_impl_from! { NonZeroU8, NonZeroI128, #[stable(feature = "nz_int_conv", since = "1.41.0")] }
451 nzint_impl_from! { NonZeroU8, NonZeroIsize, #[stable(feature = "nz_int_conv", since = "1.41.0")] }
452 nzint_impl_from! { NonZeroU16, NonZeroI32, #[stable(feature = "nz_int_conv", since = "1.41.0")] }
453 nzint_impl_from! { NonZeroU16, NonZeroI64, #[stable(feature = "nz_int_conv", since = "1.41.0")] }
454 nzint_impl_from! { NonZeroU16, NonZeroI128, #[stable(feature = "nz_int_conv", since = "1.41.0")] }
455 nzint_impl_from! { NonZeroU32, NonZeroI64, #[stable(feature = "nz_int_conv", since = "1.41.0")] }
456 nzint_impl_from! { NonZeroU32, NonZeroI128, #[stable(feature = "nz_int_conv", since = "1.41.0")] }
457 nzint_impl_from! { NonZeroU64, NonZeroI128, #[stable(feature = "nz_int_conv", since = "1.41.0")] }
459 macro_rules! nzint_impl_try_from_int {
460 ($Int: ty, $NonZeroInt: ty, #[$attr:meta], $doc: expr) => {
462 impl TryFrom<$Int> for $NonZeroInt {
463 type Error = TryFromIntError;
465 // Rustdocs on the impl block show a "[+] show undocumented items" toggle.
466 // Rustdocs on functions do not.
469 fn try_from(value: $Int) -> Result<Self, Self::Error> {
470 Self::new(value).ok_or(TryFromIntError(()))
474 ($Int: ty, $NonZeroInt: ty, #[$attr:meta]) => {
475 nzint_impl_try_from_int!($Int,
478 concat!("Attempts to convert `",
481 stringify!($NonZeroInt),
486 // Int -> Non-zero Int
487 nzint_impl_try_from_int! { u8, NonZeroU8, #[stable(feature = "nzint_try_from_int_conv", since = "1.46.0")] }
488 nzint_impl_try_from_int! { u16, NonZeroU16, #[stable(feature = "nzint_try_from_int_conv", since = "1.46.0")] }
489 nzint_impl_try_from_int! { u32, NonZeroU32, #[stable(feature = "nzint_try_from_int_conv", since = "1.46.0")] }
490 nzint_impl_try_from_int! { u64, NonZeroU64, #[stable(feature = "nzint_try_from_int_conv", since = "1.46.0")] }
491 nzint_impl_try_from_int! { u128, NonZeroU128, #[stable(feature = "nzint_try_from_int_conv", since = "1.46.0")] }
492 nzint_impl_try_from_int! { usize, NonZeroUsize, #[stable(feature = "nzint_try_from_int_conv", since = "1.46.0")] }
493 nzint_impl_try_from_int! { i8, NonZeroI8, #[stable(feature = "nzint_try_from_int_conv", since = "1.46.0")] }
494 nzint_impl_try_from_int! { i16, NonZeroI16, #[stable(feature = "nzint_try_from_int_conv", since = "1.46.0")] }
495 nzint_impl_try_from_int! { i32, NonZeroI32, #[stable(feature = "nzint_try_from_int_conv", since = "1.46.0")] }
496 nzint_impl_try_from_int! { i64, NonZeroI64, #[stable(feature = "nzint_try_from_int_conv", since = "1.46.0")] }
497 nzint_impl_try_from_int! { i128, NonZeroI128, #[stable(feature = "nzint_try_from_int_conv", since = "1.46.0")] }
498 nzint_impl_try_from_int! { isize, NonZeroIsize, #[stable(feature = "nzint_try_from_int_conv", since = "1.46.0")] }
500 macro_rules! nzint_impl_try_from_nzint {
501 ($From:ty => $To:ty, $doc: expr) => {
502 #[stable(feature = "nzint_try_from_nzint_conv", since = "1.49.0")]
503 impl TryFrom<$From> for $To {
504 type Error = TryFromIntError;
506 // Rustdocs on the impl block show a "[+] show undocumented items" toggle.
507 // Rustdocs on functions do not.
510 fn try_from(value: $From) -> Result<Self, Self::Error> {
511 TryFrom::try_from(value.get()).map(|v| {
512 // SAFETY: $From is a NonZero type, so v is not zero.
513 unsafe { Self::new_unchecked(v) }
518 ($To:ty: $($From: ty),*) => {$(
519 nzint_impl_try_from_nzint!(
522 "Attempts to convert `",
532 // Non-zero int -> non-zero unsigned int
533 nzint_impl_try_from_nzint! { NonZeroU8: NonZeroI8, NonZeroU16, NonZeroI16, NonZeroU32, NonZeroI32, NonZeroU64, NonZeroI64, NonZeroU128, NonZeroI128, NonZeroUsize, NonZeroIsize }
534 nzint_impl_try_from_nzint! { NonZeroU16: NonZeroI8, NonZeroI16, NonZeroU32, NonZeroI32, NonZeroU64, NonZeroI64, NonZeroU128, NonZeroI128, NonZeroUsize, NonZeroIsize }
535 nzint_impl_try_from_nzint! { NonZeroU32: NonZeroI8, NonZeroI16, NonZeroI32, NonZeroU64, NonZeroI64, NonZeroU128, NonZeroI128, NonZeroUsize, NonZeroIsize }
536 nzint_impl_try_from_nzint! { NonZeroU64: NonZeroI8, NonZeroI16, NonZeroI32, NonZeroI64, NonZeroU128, NonZeroI128, NonZeroUsize, NonZeroIsize }
537 nzint_impl_try_from_nzint! { NonZeroU128: NonZeroI8, NonZeroI16, NonZeroI32, NonZeroI64, NonZeroI128, NonZeroUsize, NonZeroIsize }
538 nzint_impl_try_from_nzint! { NonZeroUsize: NonZeroI8, NonZeroI16, NonZeroU32, NonZeroI32, NonZeroU64, NonZeroI64, NonZeroU128, NonZeroI128, NonZeroIsize }
540 // Non-zero int -> non-zero signed int
541 nzint_impl_try_from_nzint! { NonZeroI8: NonZeroU8, NonZeroU16, NonZeroI16, NonZeroU32, NonZeroI32, NonZeroU64, NonZeroI64, NonZeroU128, NonZeroI128, NonZeroUsize, NonZeroIsize }
542 nzint_impl_try_from_nzint! { NonZeroI16: NonZeroU16, NonZeroU32, NonZeroI32, NonZeroU64, NonZeroI64, NonZeroU128, NonZeroI128, NonZeroUsize, NonZeroIsize }
543 nzint_impl_try_from_nzint! { NonZeroI32: NonZeroU32, NonZeroU64, NonZeroI64, NonZeroU128, NonZeroI128, NonZeroUsize, NonZeroIsize }
544 nzint_impl_try_from_nzint! { NonZeroI64: NonZeroU64, NonZeroU128, NonZeroI128, NonZeroUsize, NonZeroIsize }
545 nzint_impl_try_from_nzint! { NonZeroI128: NonZeroU128, NonZeroUsize, NonZeroIsize }
546 nzint_impl_try_from_nzint! { NonZeroIsize: NonZeroU16, NonZeroU32, NonZeroI32, NonZeroU64, NonZeroI64, NonZeroU128, NonZeroI128, NonZeroUsize }