Crate one_based 

Provides OneBased* unsigned int types, which wraps several integers as 1-based index.

Example:

// constructs from 1-based.
let v = OneBasedU32::from_one_based(1).unwrap();
assert_eq!(v.as_zero_based(), 0);

// constructs from 0-based.
let v = OneBasedU64::from_zero_based(0).unwrap();
assert_eq!(v.as_one_based(), NonZeroU64::new(1).unwrap());

// fails to construct from zero as one-based.
let v: Option<OneBasedU32> = OneBasedU32::from_one_based(0);
assert_eq!(v, None);

// fails to construct from max as zero-based.
let v: Option<OneBasedU32> = OneBasedU32::from_zero_based(u32::MAX);
assert_eq!(v, None);

// string format uses 1-based.
let v: OneBasedU32 = "5".parse().unwrap();
assert_eq!(v.as_zero_based(), 4);
assert_eq!(v.to_string(), "5");

Structs

OneBasedU8

Represents 1-based index of u8.

OneBasedU16

Represents 1-based index of u16.

OneBasedU32

Represents 1-based index of u32.

OneBasedU64

Represents 1-based index of u64.

OneBasedU128

Represents 1-based index of u128.

OneBasedUsize

Represents 1-based index of usize.