Function bitvec::mem::elts

source · 
pub const fn elts<T>(bits: usize) -> usize
Expand description

§Bit Storage Calculator

Computes the number of T elements required to store some number of bits. T must be an unsigned integer type and cannot have padding bits, but this restriction cannot be placed on const fns yet.

§Parameters

  • bits: The number of bits being stored in a [T] array.

§Returns

A minimal N in [T; N] that is not less than bits.

As this is a const function, when bits is also a const expression, it can be used to compute the size of an array type, such as [u32; elts::<u32>(BITS)].

§Examples

use bitvec::mem as bv_mem;

assert_eq!(bv_mem::elts::<u8>(10), 2);
assert_eq!(bv_mem::elts::<u8>(16), 2);

let arr: [u16; bv_mem::elts::<u16>(20)] = [0; 2];