Module histribution 

Histribution: inline discrete histogram distribution.

Parse a frequency spec string into an alias table at init time. The name is a portmanteau of “histogram” + “distribution.”

Two formats:

• Implicit labels: "50 25 13 12" → outcomes 0,1,2,3 with those weights
• Explicit labels: "234:50 33:25 17:13 3:12" → outcomes 234,33,17,3

Structs

Histribution

Sample from a histogram-spec distribution. The input should be hashed (uniform); the output is one of the labeled outcomes, selected by weighted alias sampling.

ParsedHistribution

Parsed histribution: labels + weighted alias table. The #[poly_const] setup returns this single struct so the macro can hand the body a borrow of one cached field rather than a tuple. Labeled by index i → outcome labels[i]; sampling goes through table.

Functions

parse_histribution

Parse a histribution spec and build an alias table.