Method with_bitset

arrow-buffer/src/buffer/mutable.rs:229–237

Set the bits in the range of `[0, end)` to 0 (if `val` is false), or 1 (if `val` is true). Also extend the length of this buffer to be `end`. This is useful when one wants to clear (or set) the bits and then manipulate the buffer directly (e.g., modifying the buffer by holding a mutable reference from `data_mut()`). # Panics Panics if `end` exceeds the buffer capacity.

(mut self, end: usize, val: bool)

    ///
    /// Panics if `end` exceeds the buffer capacity.
    pub fn with_bitset(mut self, end: usize, val: bool) -> Self {
        assert!(end <= self.layout.size());
        let v = if val { 255 } else { 0 };
        unsafe {
            std::ptr::write_bytes(self.data.as_ptr(), v, end);
            self.len = end;
        }
        self
    }

    /// Ensure that `count` bytes from `start` contain zero bits
    ///