Method into_mutable

arrow-buffer/src/buffer/immutable.rs:383–397

Returns `MutableBuffer` for mutating the buffer if this buffer is not shared. Returns `Err` if this is shared or its allocation is from an external source or it is not allocated with alignment [`ALIGNMENT`] # Example: Creating a [`MutableBuffer`] from a [`Buffer`] ``` # use arrow_buffer::buffer::{Buffer, MutableBuffer}; let buffer: Buffer = Buffer::from(&[1u8, 2, 3, 4][..]); // Only possible to c

(self)

    ///
    /// [`ALIGNMENT`]: crate::alloc::ALIGNMENT
    pub fn into_mutable(self) -> Result<MutableBuffer, Self> {
        let ptr = self.ptr;
        let length = self.length;
        Arc::try_unwrap(self.data)
            .and_then(|bytes| {
                // The pointer of underlying buffer should not be offset.
                assert_eq!(ptr, bytes.ptr().as_ptr());
                MutableBuffer::from_bytes(bytes).map_err(Arc::new)
            })
            .map_err(|bytes| Buffer {
                data: bytes,
                ptr,
                length,
            })
    }

    /// Converts self into a `Vec`, if possible.
    ///