Method slice_with_length

arrow-buffer/src/buffer/immutable.rs:287–301

Returns a new [Buffer] that is a slice of this buffer starting at `offset`, with `length` bytes. This function is `O(1)` and does not copy any data, allowing the same memory region to be shared between buffers. # Panics Panics iff `(offset + length)` is larger than the existing length.

(&self, offset: usize, length: usize)

    /// # Panics
    /// Panics iff `(offset + length)` is larger than the existing length.
    pub fn slice_with_length(&self, offset: usize, length: usize) -> Self {
        assert!(
            offset.saturating_add(length) <= self.length,
            "the offset of the new Buffer cannot exceed the existing length: slice offset={offset} length={length} selflen={}",
            self.length
        );
        // Safety:
        // offset + length <= self.length
        let ptr = unsafe { self.ptr.add(offset) };
        Self {
            data: self.data.clone(),
            ptr,
            length,
        }
    }

    /// Returns a pointer to the start of this buffer.
    ///