uint128

usub::umath::uint128 is a portable unsigned 128-bit integer.

Storage

• Two 64-bit words: (hi, lo)
• Uses unsigned __int128 fast-path when available.

Operations

• + - * / %
• bitwise ~ & | ^
• shifts << >>
• comparisons and streaming

Formatting

• to_string() outputs base-10 without leading zeros.

Notes

Division uses a generic div_mod() fallback when __int128 is not available.