devela::_dep::memchr::arch::x86_64::sse2::memchr

Struct Two

pub struct Two(/* private fields */);
Available on crate feature dep_memchr only.
Expand description

Finds all occurrences of two bytes in a haystack.

That is, this reports matches of one of two possible bytes. For example, searching for a or b in afoobar would report matches at offsets 0, 4 and 5.

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impl Two

pub fn new(needle1: u8, needle2: u8) -> Option<Two>

Create a new searcher that finds occurrences of the needle bytes given.

This particular searcher is specialized to use SSE2 vector instructions that typically make it quite fast.

If SSE2 is unavailable in the current environment, then None is returned.

pub unsafe fn new_unchecked(needle1: u8, needle2: u8) -> Two

Create a new finder specific to SSE2 vectors and routines without checking that SSE2 is available.

§Safety

Callers must guarantee that it is safe to execute sse2 instructions in the current environment.

Note that it is a common misconception that if one compiles for an x86_64 target, then they therefore automatically have access to SSE2 instructions. While this is almost always the case, it isn’t true in 100% of cases.

pub fn is_available() -> bool

Returns true when this implementation is available in the current environment.

When this is true, it is guaranteed that Two::new will return a Some value. Similarly, when it is false, it is guaranteed that Two::new will return a None value.

Note also that for the lifetime of a single program, if this returns true then it will always return true.

pub fn find(&self, haystack: &[u8]) -> Option<usize>

Return the first occurrence of one of the needle bytes in the given haystack. If no such occurrence exists, then None is returned.

The occurrence is reported as an offset into haystack. Its maximum value is haystack.len() - 1.

pub fn rfind(&self, haystack: &[u8]) -> Option<usize>

Return the last occurrence of one of the needle bytes in the given haystack. If no such occurrence exists, then None is returned.

The occurrence is reported as an offset into haystack. Its maximum value is haystack.len() - 1.

pub unsafe fn find_raw( &self, start: *const u8, end: *const u8, ) -> Option<*const u8>

Like find, but accepts and returns raw pointers.

When a match is found, the pointer returned is guaranteed to be >= start and < end.

This routine is useful if you’re already using raw pointers and would like to avoid converting back to a slice before executing a search.

§Safety
  • Both start and end must be valid for reads.
  • Both start and end must point to an initialized value.
  • Both start and end must point to the same allocated object and must either be in bounds or at most one byte past the end of the allocated object.
  • Both start and end must be derived from a pointer to the same object.
  • The distance between start and end must not overflow isize.
  • The distance being in bounds must not rely on “wrapping around” the address space.

Note that callers may pass a pair of pointers such that start >= end. In that case, None will always be returned.

pub unsafe fn rfind_raw( &self, start: *const u8, end: *const u8, ) -> Option<*const u8>

Like rfind, but accepts and returns raw pointers.

When a match is found, the pointer returned is guaranteed to be >= start and < end.

This routine is useful if you’re already using raw pointers and would like to avoid converting back to a slice before executing a search.

§Safety
  • Both start and end must be valid for reads.
  • Both start and end must point to an initialized value.
  • Both start and end must point to the same allocated object and must either be in bounds or at most one byte past the end of the allocated object.
  • Both start and end must be derived from a pointer to the same object.
  • The distance between start and end must not overflow isize.
  • The distance being in bounds must not rely on “wrapping around” the address space.

Note that callers may pass a pair of pointers such that start >= end. In that case, None will always be returned.

pub fn iter<'a, 'h>(&'a self, haystack: &'h [u8]) -> TwoIter<'a, '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.

Trait Implementations§

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impl Clone for Two

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fn clone(&self) -> Two

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for Two

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fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter. Read more
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impl Copy for Two

Auto Trait Implementations§

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impl Freeze for Two

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impl RefUnwindSafe for Two

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impl Send for Two

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impl Sync for Two

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impl Unpin for Two

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impl UnwindSafe for Two

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type ArchivedMetadata = ()

The archived version of the pointer metadata for this type.
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Converts some archived metadata to the pointer metadata for itself.
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The alignment of this type in bytes.
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The size of this type in bytes.
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Returns the alignment of this type in bytes.
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Chain a function which takes the parameter by exclusive reference.
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unsafe fn clone_to_uninit(&self, dst: *mut u8)

🔬This is a nightly-only experimental API. (clone_to_uninit)
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fn mem_as_bytes(&self) -> &[u8]
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fn mem_as_bytes_mut(&mut self) -> &mut [u8]
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View a Sync + Unpin self as &mut [u8]. Read more
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