protocol SignedNumberType Instances of conforming types can be subtracted, arithmetically negated, and initialized from 0. Axioms: x - 0 == x -x == 0 - x -(-x) == x Inheritance Comparable, Equatable, IntegerLiteralConvertible View Protocol Hierarchy → Associated Types IntegerLiteralType Import import Swift Initializers init(integerLiteral:) Required Create an instance initialized to value. Declaration init(integerLiteral value: Self.IntegerLiteralType) Declared In IntegerLiteralConvertible Instance Methods func <(_:rhs:) Required A strict total order over instances of Self. Declaration func <(lhs: Self, rhs: Self) -> Bool Declared In Comparable func <=(_:rhs:) Declaration func <=(lhs: Self, rhs: Self) -> Bool Declared In Comparable func ==(_:rhs:) Required Returns true if lhs is equal to rhs. Equality implies substitutability. When x == y, x and y are interchangeable in any code that only depends on their values. Class instance identity as distinguished by triple-equals === is notably not part of an instance's value. Exposing other non-value aspects of Equatable types is discouraged, and any that are exposed should be explicitly pointed out in documentation. Equality is an equivalence relation x == x is true x == y implies y == x x == y and y == z implies x == z Inequality is the inverse of equality, i.e. !(x == y) iff x != y. Declaration func ==(lhs: Self, rhs: Self) -> Bool Declared In Equatable func >(_:rhs:) Declaration func >(lhs: Self, rhs: Self) -> Bool Declared In Comparable func >=(_:rhs:) Declaration func >=(lhs: Self, rhs: Self) -> Bool Declared In Comparable prefix func -(_:) Required Returns the result of negating x. Declaration prefix func -(x: Self) -> Self func -(_:rhs:) Required Returns the difference between lhs and rhs. Declaration func -(lhs: Self, rhs: Self) -> Self