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@internal ​

This page tracks the current repository implementation and is written as the 0.2.0 API baseline.

@internal is an implementation-facing package. Its functions are documented here for maintainers and advanced contributors, not as a stable public API promise.

BigInt Helpers ​

  • fn bigint_zero() -> BigInt Returns 0 as a BigInt.

  • fn bigint_one() -> BigInt Returns 1 as a BigInt.

  • fn abs_bigint(x : BigInt) -> BigInt Returns the absolute value of x.

  • fn sign_of_bigint(x : BigInt) -> Sign Converts a BigInt sign into Sign::Negative, Sign::Zero, or Sign::Positive.

Power Helpers ​

  • fn pow2(n : Int) -> BigInt Returns 2^n. Rejects negative n.

  • fn pow5(n : Int) -> BigInt Returns 5^n. Rejects negative n.

  • fn pow10(n : Int) -> BigInt Returns 10^n. Rejects negative n.

  • fn digits10(x : BigInt) -> Int Returns the decimal digit count of the absolute value of x.

Normalization Helpers ​

  • fn remove_factor2(sig : BigInt, exp : Int) -> (BigInt, Int) Removes all factors of 2 from sig and compensates them into the returned exponent.

  • fn remove_factor10(coeff : BigInt, exp : Int) -> (BigInt, Int) Removes all factors of 10 from coeff and compensates them into the returned exponent.

Rounding Helpers ​

  • fn round_positive_div(numerator : BigInt, denominator : BigInt, negative : Bool, mode : RoundingMode) -> BigInt Rounds the positive quotient numerator / denominator according to mode. The negative flag lets the routine interpret directed rounding correctly for signed values.

  • fn round_shift(magnitude : BigInt, shift : Int, negative : Bool, mode : RoundingMode) -> BigInt Rounds a right-shift-by-shift operation on a non-negative magnitude.

  • fn compare_abs(a : BigInt, b : BigInt) -> Int Compares absolute values only.

Decimal Parsing Helper ​

  • fn split_decimal_string(src : String) -> (Bool, String, Int)? Splits a decimal string into:
    • sign flag
    • digit string without separators
    • base-10 exponent adjustment

It accepts plain decimals and scientific notation in the currently implemented parser.