mikolasstuchlik

import UIKit

/// `Label` is an `UILabel` subclass that simplifies line height and letter spacing manipulation.
public final class Label: UILabel {

    /// Since line spacing is always absolute in iOS, we need to compute the correct line spacing for given
    /// font and scale.
    public enum LineHeight {
        case absoluteSpacing(CGFloat)
        case fraction(CGFloat)

mikolasstuchlik

(source_file "Sources/swift-c-article01/main.swift"
  (func_decl range=[Sources/swift-c-article01/main.swift:1:1 - line:3:1] "fce(_:)" interface type='(UnsafeMutablePointer<Int8>) -> ()' access=internal
    (parameter_list
      (parameter "ptr" interface type='UnsafeMutablePointer<Int8>') range=[Sources/swift-c-article01/main.swift:1:9 - line:1:43])
    (brace_stmt range=[Sources/swift-c-article01/main.swift:1:45 - line:3:1]
      (call_expr type='()' location=Sources/swift-c-article01/main.swift:2:5 range=[Sources/swift-c-article01/main.swift:2:5 - line:2:14] nothrow arg_labels=_:
        (declref_expr type='(Any..., String, String) -> ()' location=Sources/swift-c-article01/main.swift:2:5 range=[Sources/swift-c-article01/main.swift:2:5 - line:2:5] decl=Swift.(file).print(_:separator:terminator:) function_ref=single)
        (tuple_shuffle_expr implicit type='(Any..., separator: String, terminator: String)' location=Sources/swift-c-article01/main.swift:2:11 range=[Sources/swift-c-article01/main.swift:2:10 - 

mikolasstuchlik

(source_file "Sources/swift-c-article01/main.swift"
  (func_decl range=[Sources/swift-c-article01/main.swift:1:1 - line:3:1] "fce(_:)"
    (parameter_list
      (parameter "ptr") range=[Sources/swift-c-article01/main.swift:1:9 - line:1:43])
    (brace_stmt range=[Sources/swift-c-article01/main.swift:1:45 - line:3:1]
      (call_expr type='<null>' arg_labels=_:
        (unresolved_decl_ref_expr type='<null>' name=print function_ref=unapplied)
        (paren_expr type='<null>'
          (declref_expr type='<null>' decl=main.(file).fce(_:).ptr@Sources/swift-c-article01/main.swift:1:12 function_ref=unapplied)))))
  (top_level_code_decl range=[Sources/swift-c-article01/main.swift:5:1 - line:5:17]

mikolasstuchlik

var fce: @convention(c) (UnsafeMutablePointer<Int8>) -> Void = { ptr in
    print(ptr)
}

let myMessage = "🐱 and 🐶 in my 🏠 likes each others!"
var cString = Array(myMessage.utf8CString)

fce(&cString)

mikolasstuchlik

func fce(_ ptr: UnsafeMutablePointer<Int8>) {
    print(ptr)
}

let myMessage = "🐱 and 🐶 in my 🏠 likes each others!"
var cString = Array(myMessage.utf8CString)

fce(&cString)

mikolasstuchlik

import CswiftLib

let myMessage = "🐱 and 🐶 in my 🏠 likes each others!"
let myCString = Array(myMessage.str.utf8CString)

safely_print_message(myCString)
decorate_my_message(myCString)

mikolasstuchlik

$ head -c 15000 main.sil
[1/2] Compiling Swift Module 'swift_c_article01' (1 sources)
*** SIL module before Guaranteed Passes ***
sil_stage raw

import Builtin
import Swift
import SwiftShims

// myMessage

mikolasstuchlik

func unconst_print(_ string: UnsafeMutablePointer<Int8>)
let myMessage = "Greetings!"
var cString = Array(myMessage.utf8CString)
unconst_print(&cString)

mikolasstuchlik

func unconst_print(_ string: UnsafeMutablePointer<Int8>)
let myMessage = "Greetings!"
var cString = myMessage.utf8CString
unconst_print(&cString)

mikolasstuchlik

func unconst_print(_ string: UnsafeMutablePointer<Int8>)
var myMessage = "Greetings!"
unconst_print(&myMessage) // main.swift:5:16: error: cannot convert value of type 'String' to expected argument type 'Int8'