TrailingClosure.swift

#!/usr/bin/swift

/**

$ swift -v
Apple Swift version 1.2 (swiftlang-602.0.53.1 clang-602.0.53)

コメントアウトしたりしてどの関数が実行されるか見てみる

A,B,C -> A
A,B -> A
A,C -> A

B,C -> Error 
./trailingClosure.swift:30:1: error: ambiguous use of 'anyFunction'
anyFunction("fuga") {
^
./trailingClosure.swift:22:6: note: found this candidate
func anyFunction(message:String, extra:String? = nil, completion:()->Void) {
     ^
./trailingClosure.swift:26:6: note: found this candidate
func anyFunction(message:String, extra:String? = nil, moreExtra:String? = nil, completion:()->Void) {
     ^

B,Cでambiguousって言われるのはわかるけどA,Bのとき通っちゃうのきもちわるい？

*/

func anyFunction(message:String, completion:()->Void) {
  println("this is A")
}

func anyFunction(message:String, extra:String? = nil, completion:()->Void) {
  println("this is B")
}

func anyFunction(message:String, extra:String? = nil, moreExtra:String? = nil, completion:()->Void) {
  println("this is C")
}

anyFunction("fuga") {
  _ in
  println("hoge")
}