import Foundation struct GenericPage { let header: PageHeader let additionalFooter: String let insertedContent: (inout String) -> Void init(header: PageHeader, additionalFooter: String, insertedContent: @escaping (inout String) -> Void) { self.header = header self.additionalFooter = additionalFooter self.insertedContent = insertedContent } var content: String { var result = "" header.populate(&result) // Opens