var second: Self.Second { get set }
s3Cxx0A4PairP6second6SecondQzvp
SPZ0
import Cxx
protocol CxxPair<First, Second>
A C++ type that represents a pair of two values.
associatedtype Second
associatedtype First
init(first: Self.First, second: Self.Second)
var first: Self.First { get set }