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ast3150/AssignOptional.swift

Created October 7, 2016 12:29
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  1. ast3150 created this gist Oct 7, 2016.
    13 changes: 13 additions & 0 deletions AssignOptional.swift
    View file
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,13 @@
    precedencegroup optionalAssignPrecedence {
    associativity: left
    higherThan: AssignmentPrecedence
    }

    /// If rhs has a value, assigns rhs to lhs
    /// If rhs is an empty optional, does nothing
    infix operator ?= : optionalAssignPrecedence
    func ?=<T: Any>(lhs: inout T, rhs: T?) {
    if let rhs = rhs {
    lhs = rhs
    }
    }