Trait std::slice::SliceIndex 1.28.0[−][src]
pub unsafe trait SliceIndex<T>: Sealed where
T: ?Sized, { type Output: ?Sized; fn get(self, slice: &T) -> Option<&Self::Output>; fn get_mut(self, slice: &mut T) -> Option<&mut Self::Output>; unsafe fn get_unchecked(self, slice: *const T) -> *const Self::Output; unsafe fn get_unchecked_mut(self, slice: *mut T) -> *mut Self::Output; fn index(self, slice: &T) -> &Self::Output; fn index_mut(self, slice: &mut T) -> &mut Self::Output; }
Expand description
A helper trait used for indexing operations.
Implementations of this trait have to promise that if the argument
to get_(mut_)unchecked is a safe reference, then so is the result.
Associated Types
Required methods
slice_index_methods)Returns a shared reference to the output at this location, if in bounds.
slice_index_methods)Returns a mutable reference to the output at this location, if in bounds.
unsafe fn get_unchecked(self, slice: *const T) -> *const Self::Output
[src]
unsafe fn get_unchecked(self, slice: *const T) -> *const Self::Output
[src]slice_index_methods)Returns a shared reference to the output at this location, without
performing any bounds checking.
Calling this method with an out-of-bounds index or a dangling slice pointer
is undefined behavior even if the resulting reference is not used.
unsafe fn get_unchecked_mut(self, slice: *mut T) -> *mut Self::Output
[src]
unsafe fn get_unchecked_mut(self, slice: *mut T) -> *mut Self::Output
[src]slice_index_methods)Returns a mutable reference to the output at this location, without
performing any bounds checking.
Calling this method with an out-of-bounds index or a dangling slice pointer
is undefined behavior even if the resulting reference is not used.
slice_index_methods)Returns a shared reference to the output at this location, panicking if out of bounds.
Implementors
Implements substring slicing with syntax &self[begin .. end] or &mut self[begin .. end].
Returns a slice of the given string from the byte range
[begin, end).
This operation is O(1).
Prior to 1.20.0, these indexing operations were still supported by
direct implementation of Index and IndexMut.
Panics
Panics if begin or end does not point to the starting byte offset of
a character (as defined by is_char_boundary), if begin > end, or if
end > len.
Examples
let s = "Löwe 老虎 Léopard"; assert_eq!(&s[0 .. 1], "L"); assert_eq!(&s[1 .. 9], "öwe 老"); // these will panic: // byte 2 lies within `ö`: // &s[2 ..3]; // byte 8 lies within `老` // &s[1 .. 8]; // byte 100 is outside the string // &s[3 .. 100];Run
slice_index_methods)slice_index_methods)pub unsafe fn get_unchecked(
self,
slice: *const str
) -> *const <Range<usize> as SliceIndex<str>>::Output
[src]
pub unsafe fn get_unchecked(
self,
slice: *const str
) -> *const <Range<usize> as SliceIndex<str>>::Output
[src]slice_index_methods)pub unsafe fn get_unchecked_mut(
self,
slice: *mut str
) -> *mut <Range<usize> as SliceIndex<str>>::Output
[src]
pub unsafe fn get_unchecked_mut(
self,
slice: *mut str
) -> *mut <Range<usize> as SliceIndex<str>>::Output
[src]slice_index_methods)slice_index_methods)Implements substring slicing with syntax &self[begin ..] or &mut self[begin ..].
Returns a slice of the given string from the byte range [begin,
len). Equivalent to &self[begin .. len] or &mut self[begin .. len].
This operation is O(1).
Prior to 1.20.0, these indexing operations were still supported by
direct implementation of Index and IndexMut.
Panics
Panics if begin does not point to the starting byte offset of
a character (as defined by is_char_boundary), or if begin > len.
slice_index_methods)slice_index_methods)pub unsafe fn get_unchecked(
self,
slice: *const str
) -> *const <RangeFrom<usize> as SliceIndex<str>>::Output
[src]
pub unsafe fn get_unchecked(
self,
slice: *const str
) -> *const <RangeFrom<usize> as SliceIndex<str>>::Output
[src]slice_index_methods)pub unsafe fn get_unchecked_mut(
self,
slice: *mut str
) -> *mut <RangeFrom<usize> as SliceIndex<str>>::Output
[src]
pub unsafe fn get_unchecked_mut(
self,
slice: *mut str
) -> *mut <RangeFrom<usize> as SliceIndex<str>>::Output
[src]slice_index_methods)slice_index_methods)Implements substring slicing with syntax &self[..] or &mut self[..].
Returns a slice of the whole string, i.e., returns &self or &mut self. Equivalent to &self[0 .. len] or &mut self[0 .. len]. Unlike
other indexing operations, this can never panic.
This operation is O(1).
Prior to 1.20.0, these indexing operations were still supported by
direct implementation of Index and IndexMut.
Equivalent to &self[0 .. len] or &mut self[0 .. len].
slice_index_methods)slice_index_methods)pub unsafe fn get_unchecked(
self,
slice: *const str
) -> *const <RangeFull as SliceIndex<str>>::Output
[src]
pub unsafe fn get_unchecked(
self,
slice: *const str
) -> *const <RangeFull as SliceIndex<str>>::Output
[src]slice_index_methods)pub unsafe fn get_unchecked_mut(
self,
slice: *mut str
) -> *mut <RangeFull as SliceIndex<str>>::Output
[src]
pub unsafe fn get_unchecked_mut(
self,
slice: *mut str
) -> *mut <RangeFull as SliceIndex<str>>::Output
[src]slice_index_methods)slice_index_methods)Implements substring slicing with syntax &self[begin ..= end] or &mut self[begin ..= end].
Returns a slice of the given string from the byte range
[begin, end]. Equivalent to &self [begin .. end + 1] or &mut self[begin .. end + 1], except if end has the maximum value for
usize.
This operation is O(1).
Panics
Panics if begin does not point to the starting byte offset of
a character (as defined by is_char_boundary), if end does not point
to the ending byte offset of a character (end + 1 is either a starting
byte offset or equal to len), if begin > end, or if end >= len.
slice_index_methods)pub fn get_mut(
self,
slice: &mut str
) -> Option<&mut <RangeInclusive<usize> as SliceIndex<str>>::Output>
[src]
pub fn get_mut(
self,
slice: &mut str
) -> Option<&mut <RangeInclusive<usize> as SliceIndex<str>>::Output>
[src]slice_index_methods)pub unsafe fn get_unchecked(
self,
slice: *const str
) -> *const <RangeInclusive<usize> as SliceIndex<str>>::Output
[src]
pub unsafe fn get_unchecked(
self,
slice: *const str
) -> *const <RangeInclusive<usize> as SliceIndex<str>>::Output
[src]slice_index_methods)pub unsafe fn get_unchecked_mut(
self,
slice: *mut str
) -> *mut <RangeInclusive<usize> as SliceIndex<str>>::Output
[src]
pub unsafe fn get_unchecked_mut(
self,
slice: *mut str
) -> *mut <RangeInclusive<usize> as SliceIndex<str>>::Output
[src]slice_index_methods)pub fn index(
self,
slice: &str
) -> &<RangeInclusive<usize> as SliceIndex<str>>::OutputⓘNotable traits for RangeInclusive<A>impl<A> Iterator for RangeInclusive<A> where
A: Step, type Item = A;
[src]
pub fn index(
self,
slice: &str
) -> &<RangeInclusive<usize> as SliceIndex<str>>::OutputⓘNotable traits for RangeInclusive<A>impl<A> Iterator for RangeInclusive<A> where
A: Step, type Item = A;
[src]impl<A> Iterator for RangeInclusive<A> where
A: Step, type Item = A;slice_index_methods)pub fn index_mut(
self,
slice: &mut str
) -> &mut <RangeInclusive<usize> as SliceIndex<str>>::OutputⓘNotable traits for RangeInclusive<A>impl<A> Iterator for RangeInclusive<A> where
A: Step, type Item = A;
[src]
pub fn index_mut(
self,
slice: &mut str
) -> &mut <RangeInclusive<usize> as SliceIndex<str>>::OutputⓘNotable traits for RangeInclusive<A>impl<A> Iterator for RangeInclusive<A> where
A: Step, type Item = A;
[src]impl<A> Iterator for RangeInclusive<A> where
A: Step, type Item = A;slice_index_methods)Implements substring slicing with syntax &self[.. end] or &mut self[.. end].
Returns a slice of the given string from the byte range [0, end).
Equivalent to &self[0 .. end] or &mut self[0 .. end].
This operation is O(1).
Prior to 1.20.0, these indexing operations were still supported by
direct implementation of Index and IndexMut.
Panics
Panics if end does not point to the starting byte offset of a
character (as defined by is_char_boundary), or if end > len.
slice_index_methods)slice_index_methods)pub unsafe fn get_unchecked(
self,
slice: *const str
) -> *const <RangeTo<usize> as SliceIndex<str>>::Output
[src]
pub unsafe fn get_unchecked(
self,
slice: *const str
) -> *const <RangeTo<usize> as SliceIndex<str>>::Output
[src]slice_index_methods)pub unsafe fn get_unchecked_mut(
self,
slice: *mut str
) -> *mut <RangeTo<usize> as SliceIndex<str>>::Output
[src]
pub unsafe fn get_unchecked_mut(
self,
slice: *mut str
) -> *mut <RangeTo<usize> as SliceIndex<str>>::Output
[src]slice_index_methods)slice_index_methods)Implements substring slicing with syntax &self[..= end] or &mut self[..= end].
Returns a slice of the given string from the byte range [0, end].
Equivalent to &self [0 .. end + 1], except if end has the maximum
value for usize.
This operation is O(1).
Panics
Panics if end does not point to the ending byte offset of a character
(end + 1 is either a starting byte offset as defined by
is_char_boundary, or equal to len), or if end >= len.
pub fn get(
self,
slice: &str
) -> Option<&<RangeToInclusive<usize> as SliceIndex<str>>::Output>
[src]
pub fn get(
self,
slice: &str
) -> Option<&<RangeToInclusive<usize> as SliceIndex<str>>::Output>
[src]slice_index_methods)pub fn get_mut(
self,
slice: &mut str
) -> Option<&mut <RangeToInclusive<usize> as SliceIndex<str>>::Output>
[src]
pub fn get_mut(
self,
slice: &mut str
) -> Option<&mut <RangeToInclusive<usize> as SliceIndex<str>>::Output>
[src]slice_index_methods)pub unsafe fn get_unchecked(
self,
slice: *const str
) -> *const <RangeToInclusive<usize> as SliceIndex<str>>::Output
[src]
pub unsafe fn get_unchecked(
self,
slice: *const str
) -> *const <RangeToInclusive<usize> as SliceIndex<str>>::Output
[src]slice_index_methods)pub unsafe fn get_unchecked_mut(
self,
slice: *mut str
) -> *mut <RangeToInclusive<usize> as SliceIndex<str>>::Output
[src]
pub unsafe fn get_unchecked_mut(
self,
slice: *mut str
) -> *mut <RangeToInclusive<usize> as SliceIndex<str>>::Output
[src]slice_index_methods)slice_index_methods)pub fn index_mut(
self,
slice: &mut str
) -> &mut <RangeToInclusive<usize> as SliceIndex<str>>::Output
[src]
pub fn index_mut(
self,
slice: &mut str
) -> &mut <RangeToInclusive<usize> as SliceIndex<str>>::Output
[src]slice_index_methods)slice_index_methods)slice_index_methods)slice_index_methods)slice_index_methods)slice_index_methods)type Output = T
slice_index_methods)slice_index_methods)slice_index_methods)slice_index_methods)slice_index_methods)slice_index_methods)slice_index_methods)slice_index_methods)slice_index_methods)slice_index_methods)slice_index_methods)slice_index_methods)slice_index_methods)slice_index_methods)slice_index_methods)slice_index_methods)slice_index_methods)slice_index_methods)slice_index_methods)slice_index_methods)slice_index_methods)slice_index_methods)slice_index_methods)slice_index_methods)slice_index_methods)slice_index_methods)slice_index_methods)slice_index_methods)slice_index_methods)slice_index_methods)slice_index_methods)slice_index_methods)slice_index_methods)slice_index_methods)slice_index_methods)