use core::iter::Rev;
use crate::arch::generic::memchr as generic;
/// Search for the first occurrence of a byte in a slice.
///
/// This returns the index corresponding to the first occurrence of `needle` in
/// `haystack`, or `None` if one is not found. If an index is returned, it is
/// guaranteed to be less than `haystack.len()`.
///
/// While this is semantically the same as something like
/// `haystack.iter().position(|&b| b == needle)`, this routine will attempt to
/// use highly optimized vector operations that can be an order of magnitude
/// faster (or more).
///
/// # Example
///
/// This shows how to find the first position of a byte in a byte string.
///
/// ```
/// use memchr::memchr;
///
/// let haystack = b"the quick brown fox";
/// assert_eq!(memchr(b'k', haystack), Some(8));
/// ```
#[inline]
pub fn memchr(needle: u8, haystack: &[u8]) -> Option<usize> {
// SAFETY: memchr_raw, when a match is found, always returns a valid
// pointer between start and end.
unsafe {
generic::search_slice_with_raw(haystack, |start, end| {
memchr_raw(needle, start, end)
})
}
}
/// Search for the last occurrence of a byte in a slice.
///
/// This returns the index corresponding to the last occurrence of `needle` in
/// `haystack`, or `None` if one is not found. If an index is returned, it is
/// guaranteed to be less than `haystack.len()`.
///
/// While this is semantically the same as something like
/// `haystack.iter().rposition(|&b| b == needle)`, this routine will attempt to
/// use highly optimized vector operations that can be an order of magnitude
/// faster (or more).
///
/// # Example
///
/// This shows how to find the last position of a byte in a byte string.
///
/// ```
/// use memchr::memrchr;
///
/// let haystack = b"the quick brown fox";
/// assert_eq!(memrchr(b'o', haystack), Some(17));
/// ```
#[inline]
pub fn memrchr(needle: u8, haystack: &[u8]) -> Option<usize> {
// SAFETY: memrchr_raw, when a match is found, always returns a valid
// pointer between start and end.
unsafe {
generic::search_slice_with_raw(haystack, |start, end| {
memrchr_raw(needle, start, end)
})
}
}
/// Search for the first occurrence of two possible bytes in a haystack.
///
/// This returns the index corresponding to the first occurrence of one of the
/// needle bytes in `haystack`, or `None` if one is not found. If an index is
/// returned, it is guaranteed to be less than `haystack.len()`.
///
/// While this is semantically the same as something like
/// `haystack.iter().position(|&b| b == needle1 || b == needle2)`, this routine
/// will attempt to use highly optimized vector operations that can be an order
/// of magnitude faster (or more).
///
/// # Example
///
/// This shows how to find the first position of one of two possible bytes in a
/// haystack.
///
/// ```
/// use memchr::memchr2;
///
/// let haystack = b"the quick brown fox";
/// assert_eq!(memchr2(b'k', b'q', haystack), Some(4));
/// ```
#[inline]
pub fn memchr2(needle1: u8, needle2: u8, haystack: &[u8]) -> Option<usize> {
// SAFETY: memchr2_raw, when a match is found, always returns a valid
// pointer between start and end.
unsafe {
generic::search_slice_with_raw(haystack, |start, end| {
memchr2_raw(needle1, needle2, start, end)
})
}
}
/// Search for the last occurrence of two possible bytes in a haystack.
///
/// This returns the index corresponding to the last occurrence of one of the
/// needle bytes in `haystack`, or `None` if one is not found. If an index is
/// returned, it is guaranteed to be less than `haystack.len()`.
///
/// While this is semantically the same as something like
/// `haystack.iter().rposition(|&b| b == needle1 || b == needle2)`, this
/// routine will attempt to use highly optimized vector operations that can be
/// an order of magnitude faster (or more).
///
/// # Example
///
/// This shows how to find the last position of one of two possible bytes in a
/// haystack.
///
/// ```
/// use memchr::memrchr2;
///
/// let haystack = b"the quick brown fox";
/// assert_eq!(memrchr2(b'k', b'o', haystack), Some(17));
/// ```
#[inline]
pub fn memrchr2(needle1: u8, needle2: u8, haystack: &[u8]) -> Option<usize> {
// SAFETY: memrchr2_raw, when a match is found, always returns a valid
// pointer between start and end.
unsafe {
generic::search_slice_with_raw(haystack, |start, end| {
memrchr2_raw(needle1, needle2, start, end)
})
}
}
/// Search for the first occurrence of three possible bytes in a haystack.
///
/// This returns the index corresponding to the first occurrence of one of the
/// needle bytes in `haystack`, or `None` if one is not found. If an index is
/// returned, it is guaranteed to be less than `haystack.len()`.
///
/// While this is semantically the same as something like
/// `haystack.iter().position(|&b| b == needle1 || b == needle2 || b == needle3)`,
/// this routine will attempt to use highly optimized vector operations that
/// can be an order of magnitude faster (or more).
///
/// # Example
///
/// This shows how to find the first position of one of three possible bytes in
/// a haystack.
///
/// ```
/// use memchr::memchr3;
///
/// let haystack = b"the quick brown fox";
/// assert_eq!(memchr3(b'k', b'q', b'u', haystack), Some(4));
/// ```
#[inline]
pub fn memchr3(
needle1: u8,
needle2: u8,
needle3: u8,
haystack: &[u8],
) -> Option<usize> {
// SAFETY: memchr3_raw, when a match is found, always returns a valid
// pointer between start and end.
unsafe {
generic::search_slice_with_raw(haystack, |start, end| {
memchr3_raw(needle1, needle2, needle3, start, end)
})
}
}
/// Search for the last occurrence of three possible bytes in a haystack.
///
/// This returns the index corresponding to the last occurrence of one of the
/// needle bytes in `haystack`, or `None` if one is not found. If an index is
/// returned, it is guaranteed to be less than `haystack.len()`.
///
/// While this is semantically the same as something like
/// `haystack.iter().rposition(|&b| b == needle1 || b == needle2 || b == needle3)`,
/// this routine will attempt to use highly optimized vector operations that
/// can be an order of magnitude faster (or more).
///
/// # Example
///
/// This shows how to find the last position of one of three possible bytes in
/// a haystack.
///
/// ```
/// use memchr::memrchr3;
///
/// let haystack = b"the quick brown fox";
/// assert_eq!(memrchr3(b'k', b'o', b'n', haystack), Some(17));
/// ```
#[inline]
pub fn memrchr3(
needle1: u8,
needle2: u8,
needle3: u8,
haystack: &[u8],
) -> Option<usize> {
// SAFETY: memrchr3_raw, when a match is found, always returns a valid
// pointer between start and end.
unsafe {
generic::search_slice_with_raw(haystack, |start, end| {
memrchr3_raw(needle1, needle2, needle3, start, end)
})
}
}
/// Returns an iterator over all occurrences of the needle in a haystack.
///
/// The iterator returned implements `DoubleEndedIterator`. This means it
/// can also be used to find occurrences in reverse order.
#[inline]
pub fn memchr_iter<'h>(needle: u8, haystack: &'h [u8]) -> Memchr<'h> {
Memchr::new(needle, haystack)
}
/// Returns an iterator over all occurrences of the needle in a haystack, in
/// reverse.
#[inline]
pub fn memrchr_iter(needle: u8, haystack: &[u8]) -> Rev<Memchr<'_>> {
Memchr::new(needle, haystack).rev()
}
/// Returns an iterator over all occurrences of the needles in a haystack.
///
/// The iterator returned implements `DoubleEndedIterator`. This means it
/// can also be used to find occurrences in reverse order.
#[inline]
pub fn memchr2_iter<'h>(
needle1: u8,
needle2: u8,
haystack: &'h [u8],
) -> Memchr2<'h> {
Memchr2::new(needle1, needle2, haystack)
}
/// Returns an iterator over all occurrences of the needles in a haystack, in
/// reverse.
#[inline]
pub fn memrchr2_iter(
needle1: u8,
needle2: u8,
haystack: &[u8],
) -> Rev<Memchr2<'_>> {
Memchr2::new(needle1, needle2, haystack).rev()
}
/// Returns an iterator over all occurrences of the needles in a haystack.
///
/// The iterator returned implements `DoubleEndedIterator`. This means it
/// can also be used to find occurrences in reverse order.
#[inline]
pub fn memchr3_iter<'h>(
needle1: u8,
needle2: u8,
needle3: u8,
haystack: &'h [u8],
) -> Memchr3<'h> {
Memchr3::new(needle1, needle2, needle3, haystack)
}
/// Returns an iterator over all occurrences of the needles in a haystack, in
/// reverse.
#[inline]
pub fn memrchr3_iter(
needle1: u8,
needle2: u8,
needle3: u8,
haystack: &[u8],
) -> Rev<Memchr3<'_>> {
Memchr3::new(needle1, needle2, needle3, haystack).rev()
}
/// An iterator over all occurrences of a single byte in a haystack.
///
/// This iterator implements `DoubleEndedIterator`, which means it can also be
/// used to find occurrences in reverse order.
///
/// This iterator is created by the [`memchr_iter`] or `[memrchr_iter`]
/// functions. It can also be created with the [`Memchr::new`] method.
///
/// The lifetime parameter `'h` refers to the lifetime of the haystack being
/// searched.
#[derive(Clone, Debug)]
pub struct Memchr<'h> {
needle1: u8,
it: crate::arch::generic::memchr::Iter<'h>,
}
impl<'h> Memchr<'h> {
/// Returns an iterator over all occurrences of the needle byte in the
/// given haystack.
///
/// The iterator returned implements `DoubleEndedIterator`. This means it
/// can also be used to find occurrences in reverse order.
#[inline]
pub fn new(needle1: u8, haystack: &'h [u8]) -> Memchr<'h> {
Memchr {
needle1,
it: crate::arch::generic::memchr::Iter::new(haystack),
}
}
}
impl<'h> Iterator for Memchr<'h> {
type Item = usize;
#[inline]
fn next(&mut self) -> Option<usize> {
// SAFETY: All of our implementations of memchr ensure that any
// pointers returns will fall within the start and end bounds, and this
// upholds the safety contract of `self.it.next`.
unsafe {
// NOTE: I attempted to define an enum of previously created
// searchers and then switch on those here instead of just
// calling `memchr_raw` (or `One::new(..).find_raw(..)`). But
// that turned out to have a fair bit of extra overhead when
// searching very small haystacks.
self.it.next(|s, e| memchr_raw(self.needle1, s, e))
}
}
#[inline]
fn count(self) -> usize {
self.it.count(|s, e| {
// SAFETY: We rely on our generic iterator to return valid start
// and end pointers.
unsafe { count_raw(self.needle1, s, e) }
})
}
#[inline]
fn size_hint(&self) -> (usize, Option<usize>) {
self.it.size_hint()
}
}
impl<'h> DoubleEndedIterator for Memchr<'h> {
#[inline]
fn next_back(&mut self) -> Option<usize> {
// SAFETY: All of our implementations of memchr ensure that any
// pointers returns will fall within the start and end bounds, and this
// upholds the safety contract of `self.it.next_back`.
unsafe { self.it.next_back(|s, e| memrchr_raw(self.needle1, s, e)) }
}
}
impl<'h> core::iter::FusedIterator for Memchr<'h> {}
/// An iterator over all occurrences of two possible bytes in a haystack.
///
/// This iterator implements `DoubleEndedIterator`, which means it can also be
/// used to find occurrences in reverse order.
///
/// This iterator is created by the [`memchr2_iter`] or `[memrchr2_iter`]
/// functions. It can also be created with the [`Memchr2::new`] method.
///
/// The lifetime parameter `'h` refers to the lifetime of the haystack being
/// searched.
#[derive(Clone, Debug)]
pub struct Memchr2<'h> {
needle1: u8,
needle2: u8,
it: crate::arch::generic::memchr::Iter<'h>,
}
impl<'h> Memchr2<'h> {
/// Returns an iterator over all occurrences of the needle bytes in the
/// given haystack.
///
/// The iterator returned implements `DoubleEndedIterator`. This means it
/// can also be used to find occurrences in reverse order.
#[inline]
pub fn new(needle1: u8, needle2: u8, haystack: &'h [u8]) -> Memchr2<'h> {
Memchr2 {
needle1,
needle2,
it: crate::arch::generic::memchr::Iter::new(haystack),
}
}
}
impl<'h> Iterator for Memchr2<'h> {
type Item = usize;
#[inline]
fn next(&mut self) -> Option<usize> {
// SAFETY: All of our implementations of memchr ensure that any
// pointers returns will fall within the start and end bounds, and this
// upholds the safety contract of `self.it.next`.
unsafe {
self.it.next(|s, e| memchr2_raw(self.needle1, self.needle2, s, e))
}
}
#[inline]
fn size_hint(&self) -> (usize, Option<usize>) {
self.it.size_hint()
}
}
impl<'h> DoubleEndedIterator for Memchr2<'h> {
#[inline]
fn next_back(&mut self) -> Option<usize> {
// SAFETY: All of our implementations of memchr ensure that any
// pointers returns will fall within the start and end bounds, and this
// upholds the safety contract of `self.it.next_back`.
unsafe {
self.it.next_back(|s, e| {
memrchr2_raw(self.needle1, self.needle2, s, e)
})
}
}
}
impl<'h> core::iter::FusedIterator for Memchr2<'h> {}
/// An iterator over all occurrences of three possible bytes in a haystack.
///
/// This iterator implements `DoubleEndedIterator`, which means it can also be
/// used to find occurrences in reverse order.
///
/// This iterator is created by the [`memchr2_iter`] or `[memrchr2_iter`]
/// functions. It can also be created with the [`Memchr3::new`] method.
///
/// The lifetime parameter `'h` refers to the lifetime of the haystack being
/// searched.
#[derive(Clone, Debug)]
pub struct Memchr3<'h> {
needle1: u8,
needle2: u8,
needle3: u8,
it: crate::arch::generic::memchr::Iter<'h>,
}
impl<'h> Memchr3<'h> {
/// Returns an iterator over all occurrences of the needle bytes in the
/// given haystack.
///
/// The iterator returned implements `DoubleEndedIterator`. This means it
/// can also be used to find occurrences in reverse order.
#[inline]
pub fn new(
needle1: u8,
needle2: u8,
needle3: u8,
haystack: &'h [u8],
) -> Memchr3<'h> {
Memchr3 {
needle1,
needle2,
needle3,
it: crate::arch::generic::memchr::Iter::new(haystack),
}
}
}
impl<'h> Iterator for Memchr3<'h> {
type Item = usize;
#[inline]
fn next(&mut self) -> Option<usize> {
// SAFETY: All of our implementations of memchr ensure that any
// pointers returns will fall within the start and end bounds, and this
// upholds the safety contract of `self.it.next`.
unsafe {
self.it.next(|s, e| {
memchr3_raw(self.needle1, self.needle2, self.needle3, s, e)
})
}
}
#[inline]
fn size_hint(&self) -> (usize, Option<usize>) {
self.it.size_hint()
}
}
impl<'h> DoubleEndedIterator for Memchr3<'h> {
#[inline]
fn next_back(&mut self) -> Option<usize> {
// SAFETY: All of our implementations of memchr ensure that any
// pointers returns will fall within the start and end bounds, and this
// upholds the safety contract of `self.it.next_back`.
unsafe {
self.it.next_back(|s, e| {
memrchr3_raw(self.needle1, self.needle2, self.needle3, s, e)
})
}
}
}
impl<'h> core::iter::FusedIterator for Memchr3<'h> {}
/// memchr, but using raw pointers to represent the haystack.
///
/// # Safety
///
/// Pointers must be valid. See `One::find_raw`.
#[inline]
unsafe fn memchr_raw(
needle: u8,
start: *const u8,
end: *const u8,
) -> Option<*const u8> {
#[cfg(target_arch = "x86_64")]
{
// x86_64 does CPU feature detection at runtime in order to use AVX2
// instructions even when the `avx2` feature isn't enabled at compile
// time. This function also handles using a fallback if neither AVX2
// nor SSE2 (unusual) are available.
crate::arch::x86_64::memchr::memchr_raw(needle, start, end)
}
#[cfg(all(target_arch = "wasm32", target_feature = "simd128"))]
{
crate::arch::wasm32::memchr::memchr_raw(needle, start, end)
}
#[cfg(target_arch = "aarch64")]
{
crate::arch::aarch64::memchr::memchr_raw(needle, start, end)
}
#[cfg(not(any(
target_arch = "x86_64",
all(target_arch = "wasm32", target_feature = "simd128"),
target_arch = "aarch64"
)))]
{
crate::arch::all::memchr::One::new(needle).find_raw(start, end)
}
}
/// memrchr, but using raw pointers to represent the haystack.
///
/// # Safety
///
/// Pointers must be valid. See `One::rfind_raw`.
#[inline]
unsafe fn memrchr_raw(
needle: u8,
start: *const u8,
end: *const u8,
) -> Option<*const u8> {
#[cfg(target_arch = "x86_64")]
{
crate::arch::x86_64::memchr::memrchr_raw(needle, start, end)
}
#[cfg(all(target_arch = "wasm32", target_feature = "simd128"))]
{
crate::arch::wasm32::memchr::memrchr_raw(needle, start, end)
}
#[cfg(target_arch = "aarch64")]
{
crate::arch::aarch64::memchr::memrchr_raw(needle, start, end)
}
#[cfg(not(any(
target_arch = "x86_64",
all(target_arch = "wasm32", target_feature = "simd128"),
target_arch = "aarch64"
)))]
{
crate::arch::all::memchr::One::new(needle).rfind_raw(start, end)
}
}
/// memchr2, but using raw pointers to represent the haystack.
///
/// # Safety
///
/// Pointers must be valid. See `Two::find_raw`.
#[inline]
unsafe fn memchr2_raw(
needle1: u8,
needle2: u8,
start: *const u8,
end: *const u8,
) -> Option<*const u8> {
#[cfg(target_arch = "x86_64")]
{
crate::arch::x86_64::memchr::memchr2_raw(needle1, needle2, start, end)
}
#[cfg(all(target_arch = "wasm32", target_feature = "simd128"))]
{
crate::arch::wasm32::memchr::memchr2_raw(needle1, needle2, start, end)
}
#[cfg(target_arch = "aarch64")]
{
crate::arch::aarch64::memchr::memchr2_raw(needle1, needle2, start, end)
}
#[cfg(not(any(
target_arch = "x86_64",
all(target_arch = "wasm32", target_feature = "simd128"),
target_arch = "aarch64"
)))]
{
crate::arch::all::memchr::Two::new(needle1, needle2)
.find_raw(start, end)
}
}
/// memrchr2, but using raw pointers to represent the haystack.
///
/// # Safety
///
/// Pointers must be valid. See `Two::rfind_raw`.
#[inline]
unsafe fn memrchr2_raw(
needle1: u8,
needle2: u8,
start: *const u8,
end: *const u8,
) -> Option<*const u8> {
#[cfg(target_arch = "x86_64")]
{
crate::arch::x86_64::memchr::memrchr2_raw(needle1, needle2, start, end)
}
#[cfg(all(target_arch = "wasm32", target_feature = "simd128"))]
{
crate::arch::wasm32::memchr::memrchr2_raw(needle1, needle2, start, end)
}
#[cfg(target_arch = "aarch64")]
{
crate::arch::aarch64::memchr::memrchr2_raw(
needle1, needle2, start, end,
)
}
#[cfg(not(any(
target_arch = "x86_64",
all(target_arch = "wasm32", target_feature = "simd128"),
target_arch = "aarch64"
)))]
{
crate::arch::all::memchr::Two::new(needle1, needle2)
.rfind_raw(start, end)
}
}
/// memchr3, but using raw pointers to represent the haystack.
///
/// # Safety
///
/// Pointers must be valid. See `Three::find_raw`.
#[inline]
unsafe fn memchr3_raw(
needle1: u8,
needle2: u8,
needle3: u8,
start: *const u8,
end: *const u8,
) -> Option<*const u8> {
#[cfg(target_arch = "x86_64")]
{
crate::arch::x86_64::memchr::memchr3_raw(
needle1, needle2, needle3, start, end,
)
}
#[cfg(all(target_arch = "wasm32", target_feature = "simd128"))]
{
crate::arch::wasm32::memchr::memchr3_raw(
needle1, needle2, needle3, start, end,
)
}
#[cfg(target_arch = "aarch64")]
{
crate::arch::aarch64::memchr::memchr3_raw(
needle1, needle2, needle3, start, end,
)
}
#[cfg(not(any(
target_arch = "x86_64",
all(target_arch = "wasm32", target_feature = "simd128"),
target_arch = "aarch64"
)))]
{
crate::arch::all::memchr::Three::new(needle1, needle2, needle3)
.find_raw(start, end)
}
}
/// memrchr3, but using raw pointers to represent the haystack.
///
/// # Safety
///
/// Pointers must be valid. See `Three::rfind_raw`.
#[inline]
unsafe fn memrchr3_raw(
needle1: u8,
needle2: u8,
needle3: u8,
start: *const u8,
end: *const u8,
) -> Option<*const u8> {
#[cfg(target_arch = "x86_64")]
{
crate::arch::x86_64::memchr::memrchr3_raw(
needle1, needle2, needle3, start, end,
)
}
#[cfg(all(target_arch = "wasm32", target_feature = "simd128"))]
{
crate::arch::wasm32::memchr::memrchr3_raw(
needle1, needle2, needle3, start, end,
)
}
#[cfg(target_arch = "aarch64")]
{
crate::arch::aarch64::memchr::memrchr3_raw(
needle1, needle2, needle3, start, end,
)
}
#[cfg(not(any(
target_arch = "x86_64",
all(target_arch = "wasm32", target_feature = "simd128"),
target_arch = "aarch64"
)))]
{
crate::arch::all::memchr::Three::new(needle1, needle2, needle3)
.rfind_raw(start, end)
}
}
/// Count all matching bytes, but using raw pointers to represent the haystack.
///
/// # Safety
///
/// Pointers must be valid. See `One::count_raw`.
#[inline]
unsafe fn count_raw(needle: u8, start: *const u8, end: *const u8) -> usize {
#[cfg(target_arch = "x86_64")]
{
crate::arch::x86_64::memchr::count_raw(needle, start, end)
}
#[cfg(all(target_arch = "wasm32", target_feature = "simd128"))]
{
crate::arch::wasm32::memchr::count_raw(needle, start, end)
}
#[cfg(target_arch = "aarch64")]
{
crate::arch::aarch64::memchr::count_raw(needle, start, end)
}
#[cfg(not(any(
target_arch = "x86_64",
all(target_arch = "wasm32", target_feature = "simd128"),
target_arch = "aarch64"
)))]
{
crate::arch::all::memchr::One::new(needle).count_raw(start, end)
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn forward1_iter() {
crate::tests::memchr::Runner::new(1).forward_iter(
|haystack, needles| {
Some(memchr_iter(needles[0], haystack).collect())
},
)
}
#[test]
fn forward1_oneshot() {
crate::tests::memchr::Runner::new(1).forward_oneshot(
|haystack, needles| Some(memchr(needles[0], haystack)),
)
}
#[test]
fn reverse1_iter() {
crate::tests::memchr::Runner::new(1).reverse_iter(
|haystack, needles| {
Some(memrchr_iter(needles[0], haystack).collect())
},
)
}
#[test]
fn reverse1_oneshot() {
crate::tests::memchr::Runner::new(1).reverse_oneshot(
|haystack, needles| Some(memrchr(needles[0], haystack)),
)
}
#[test]
fn count1_iter() {
crate::tests::memchr::Runner::new(1).count_iter(|haystack, needles| {
Some(memchr_iter(needles[0], haystack).count())
})
}
#[test]
fn forward2_iter() {
crate::tests::memchr::Runner::new(2).forward_iter(
|haystack, needles| {
let n1 = needles.get(0).copied()?;
let n2 = needles.get(1).copied()?;
Some(memchr2_iter(n1, n2, haystack).collect())
},
)
}
#[test]
fn forward2_oneshot() {
crate::tests::memchr::Runner::new(2).forward_oneshot(
|haystack, needles| {
let n1 = needles.get(0).copied()?;
let n2 = needles.get(1).copied()?;
Some(memchr2(n1, n2, haystack))
},
)
}
#[test]
fn reverse2_iter() {
crate::tests::memchr::Runner::new(2).reverse_iter(
|haystack, needles| {
let n1 = needles.get(0).copied()?;
let n2 = needles.get(1).copied()?;
Some(memrchr2_iter(n1, n2, haystack).collect())
},
)
}
#[test]
fn reverse2_oneshot() {
crate::tests::memchr::Runner::new(2).reverse_oneshot(
|haystack, needles| {
let n1 = needles.get(0).copied()?;
let n2 = needles.get(1).copied()?;
Some(memrchr2(n1, n2, haystack))
},
)
}
#[test]
fn forward3_iter() {
crate::tests::memchr::Runner::new(3).forward_iter(
|haystack, needles| {
let n1 = needles.get(0).copied()?;
let n2 = needles.get(1).copied()?;
let n3 = needles.get(2).copied()?;
Some(memchr3_iter(n1, n2, n3, haystack).collect())
},
)
}
#[test]
fn forward3_oneshot() {
crate::tests::memchr::Runner::new(3).forward_oneshot(
|haystack, needles| {
let n1 = needles.get(0).copied()?;
let n2 = needles.get(1).copied()?;
let n3 = needles.get(2).copied()?;
Some(memchr3(n1, n2, n3, haystack))
},
)
}
#[test]
fn reverse3_iter() {
crate::tests::memchr::Runner::new(3).reverse_iter(
|haystack, needles| {
let n1 = needles.get(0).copied()?;
let n2 = needles.get(1).copied()?;
let n3 = needles.get(2).copied()?;
Some(memrchr3_iter(n1, n2, n3, haystack).collect())
},
)
}
#[test]
fn reverse3_oneshot() {
crate::tests::memchr::Runner::new(3).reverse_oneshot(
|haystack, needles| {
let n1 = needles.get(0).copied()?;
let n2 = needles.get(1).copied()?;
let n3 = needles.get(2).copied()?;
Some(memrchr3(n1, n2, n3, haystack))
},
)
}
// Prior to memchr 2.6, the memchr iterators both implemented Send and
// Sync. But in memchr 2.6, the iterator changed to use raw pointers
// internally and I didn't add explicit Send/Sync impls. This ended up
// regressing the API. This test ensures we don't do that again.
//
// See: https://github.com/BurntSushi/memchr/issues/133
#[test]
fn sync_regression() {
use core::panic::{RefUnwindSafe, UnwindSafe};
fn assert_send_sync<T: Send + Sync + UnwindSafe + RefUnwindSafe>() {}
assert_send_sync::<Memchr>();
assert_send_sync::<Memchr2>();
assert_send_sync::<Memchr3>()
}
}
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