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Showing content from http://doc.rust-lang.org/nightly/std/slice/trait.SliceIndex.html below:

SliceIndex in std::slice - Rust

pub unsafe trait SliceIndex<T>: Sealed{
    type Output: ?Sized;

    // Required methods
    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;
}

A helper trait used for indexing operations.

Implementations of this trait have to promise that if the argument to get_unchecked(_mut) is a safe reference, then so is the result.

The output type returned by methods.

Returns a shared reference to the output at this location, if in bounds.

Returns a mutable reference to the output at this location, if in bounds.

Returns a pointer 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 pointer is not used.

Returns a mutable pointer 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 pointer is not used.

Returns a shared reference to the output at this location, panicking if out of bounds.

Returns a mutable reference to the output at this location, panicking if out of bounds.

Implements substring slicing for arbitrary bounds.

Returns a slice of the given string bounded by the byte indices provided by each bound.

This operation is O(1).

Panics if begin or end (if it exists and once adjusted for inclusion/exclusion) does not point to the starting byte offset of a character (as defined by is_char_boundary), if begin > end, or if end > len.

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 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.

let s = "Löwe 老虎 Léopard";
assert_eq!(&s[0 .. 1], "L");

assert_eq!(&s[1 .. 9], "öwe 老");

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 if begin does not point to the starting byte offset of a character (as defined by is_char_boundary), or if begin > len.

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].

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 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.

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 if end does not point to the starting byte offset of a character (as defined by is_char_boundary), or if end > len.

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 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.

The methods index and index_mut panic if the index is out of bounds.

The methods index and index_mut panic if:

• the start of the range is greater than the end of the range or
• the end of the range is out of bounds.

The methods index and index_mut panic if the start of the range is out of bounds.

The methods index and index_mut panic if:

• the end of the range is usize::MAX or
• the start of the range is greater than the end of the range or
• the end of the range is out of bounds.

The methods index and index_mut panic if the end of the range is out of bounds.

The methods index and index_mut panic if the end of the range is out of bounds.

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