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 fn
s 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];