Method extend_from_slice

arrow-buffer/src/buffer/mutable.rs:592–604

(&mut self, items: &[T])

    /// reasons as [`MutableBuffer::reserve`].
    #[inline]
    pub fn extend_from_slice<T: ArrowNativeType>(&mut self, items: &[T]) {
        let additional = mem::size_of_val(items);
        self.reserve(additional);
        unsafe {
            // this assumes that `[ToByteSlice]` can be copied directly
            // without calling `to_byte_slice` for each element,
            // which is correct for all ArrowNativeType implementations.
            let src = items.as_ptr() as *const u8;
            let dst = self.data.as_ptr().add(self.len);
            std::ptr::copy_nonoverlapping(src, dst, additional)
        }
        self.len += additional;
    }

    /// Extends the buffer with a new item, increasing its capacity if needed.
    /// # Example