--- title: StaticBigInt framework: swift role: symbol role_heading: Structure path: swift/staticbigint --- # StaticBigInt An immutable arbitrary-precision signed integer. ## Declaration ```swift @frozen struct StaticBigInt ``` ## Overview Overview StaticBigInt is primarily intended to be used as the associated type of an ExpressibleByIntegerLiteral conformance. extension UInt256: ExpressibleByIntegerLiteral { public init(integerLiteral value: StaticBigInt) { precondition( value.signum() >= 0 && value.bitWidth <= 1 + Self.bitWidth, "integer overflow: '\(value)' as '\(Self.self)'" ) self.words = Words() for wordIndex in 0..