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eihwaz/bit-long-vec

Vector with fixed bit sized values stored in long

bit-long-vec

crates.io
Build Status
codecov

Vector with fixed bit sized values stored in long. Effective to reduce the amount of memory needed for storage
values whose size is not a power of 2. As drawback to set and get values uses additional CPU cycles for bit operations.

Usage

Add this to your Cargo.toml:

[dependencies]
bit-long-vec = "0.2"

Example

In this particular scenario, we want to store 10 bit values. It takes 200 bytes to store 100 values using short.
To store 100 values using a bit long vector, 15 lengths are required, which is 120 bytes. (-40%).

use bit_long_vec::BitLongVec;

let mut vec = BitLongVec::with_fixed_capacity(100, 10);

for index in 0..100 {
    vec.set(index, 1023);

    assert_eq!(vec.get(index), 1023);
}

Languages

Rust100.0%

Contributors

MIT License
Created September 29, 2019
Updated January 16, 2021