ludic/docs/language/bigint/bigint-to_int.md
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feat(types): BigInt + Decimal exact economy numbers (#52)
Types phase 2 — the "money problem". A splice-on-demand bignum engine
(runtime/native/bignum.ludic, self-contained, only intrinsics) exposed as
two namespaces:

- BigInt.* — arbitrary-precision integer (sign-magnitude, base-1e9 limbs):
  from/parse, add/sub/mul/pow, div/mod (by int), cmp/eq/is_zero, to_int, str.
  For idle counters and exact huge currencies that overflow a 32/64-bit int.
- Decimal.* — exact base-10 fixed point (BigInt mantissa + decimal scale):
  from/parse, exact add/sub/mul, cmp/eq, scale/rescale (truncate), str.
  So 0.10 + 0.20 is exactly 0.30 — no binary rounding.

Both exact => deterministic; no f32/f64. Wired: parser splice trigger
(g_uses_bignum), emit_call dispatch, reseeded seed, a self-asserting example
(examples/library/bignum.ludic + feat_case), and per-symbol docs + inventory.
All suites green incl. golden renders byte-identical and the bootstrap fixpoint.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
2026-08-31 18:45:14 +03:00

506 B

id name category kind tokens sig tip order ns member
bigint-to_int BigInt.to_int bigint namespace-method BigInt.to_int BigInt.to_int(a) -> int Narrow a big integer to a plain int (clamped). 12 BigInt to_int

Returns the value as a plain int when it fits in 32 bits, clamping to the int min/max otherwise. Use it to feed a small big-integer back into ordinary code.

program Demo {
  handler Step phase Update {
    let n = BigInt.to_int(BigInt.from(2024))
  }
}