cue eval -ic bound.cue
cmp stdout expect-stdout-cue

-- frontmatter.toml --
title = "Predefined Bounds"
description = ""

-- text.md --
CUE numbers have arbitrary precision.
Also there is no unsigned integer type.

CUE defines the following predefined identifiers to restrict the bounds of
integers to common values.

```
uint      >=0
uint8     >=0 & <=255
int8      >=-128 & <=127
uint16    >=0 & <=65536
int16     >=-32_768 & <=32_767
rune      >=0 & <=0x10FFFF
uint32    >=0 & <=4_294_967_296
int32     >=-2_147_483_648 & <=2_147_483_647
uint64    >=0 & <=18_446_744_073_709_551_615
int64     >=-9_223_372_036_854_775_808 & <=9_223_372_036_854_775_807
int128    >=-170_141_183_460_469_231_731_687_303_715_884_105_728 &
              <=170_141_183_460_469_231_731_687_303_715_884_105_727
uint128   >=0 & <=340_282_366_920_938_463_463_374_607_431_768_211_455
```

-- bound.cue --
#positive: uint
#byte:     uint8
#word:     int32

a: #positive & -1
b: #byte & 128
c: #word & 2_000_000_000

-- expect-stdout-cue --
a: _|_ // invalid value -1 (out of bound int & >=0)
b: 128
c: 2000000000