# fill_via_u64_chunks in rand_core::impls - Rust
Implement `fill_bytes` by reading chunks from the output buffer of a block based RNG.
Keywords: rust, rustlang, rust-lang, fill_via_u64_chunks

# Function rand_core::impls::fill_via_u64_chunks

source · [−]

    pub fn fill_via_u64_chunks(src: &[u64], dest: &mut [u8]) -> (usize, usize)

Expand description

Implement `fill_bytes` by reading chunks from the output buffer of a block based RNG.

The return values are `(consumed_u64, filled_u8)`. `filled_u8` is the number of filled bytes in `dest`, which may be less than the length of `dest`. `consumed_u64` is the number of words consumed from `src`, which is the same as `filled_u8 / 8` rounded up.

See `fill_via_u32_chunks` for an example.