Module contract 

Bidding, penalties, and scoring in contract bridge.

Level wraps a 1..=7 contract level, Bid pairs a level with a Strain, and Contract adds a Penalty (undoubled, doubled, redoubled). Contract::score returns the duplicate score for a given trick count and vulnerability.

Panic policy

The safe constructors that take raw levels — Level::new, Bid::new, and Contract::new — panic when the level is outside 1..=7, and have Level::try_new for fallible construction. In const contexts the panic becomes a compile-time error.

Structs

Bid

A call that proposes a contract

Contract

The statement of the pair winning the bidding that they will take at least the number of tricks (in addition to the book of 6 tricks), and the strain denotes the trump suit.

InvalidLevel

Error indicating an invalid level

Level

The level of a contract, from 1 to 7

ParseBidError

Error returned when parsing a Bid fails

ParseContractError

Error returned when parsing a Contract fails

ParseLevelError

Error returned when parsing a Level fails

ParsePenaltyError

Error returned when parsing Penalty fails

Enums

Penalty

Penalty inflicted on a contract