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casts.swift
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// RUN: %target-run-simple-swift
// REQUIRES: executable_test
// REQUIRES: objc_interop
import StdlibUnittest
import Foundation
// Make sure at the end of the file we run the tests.
defer{runAllTests()}
protocolP:class{}
protocolC:class{}
classFoo:NSObject{}
varCasts=TestSuite("Casts")
@inline(never)
func castit<ObjectType>(_ o:NSObject?, _ t:ObjectType.Type)->ObjectType?{
return o as?ObjectType
}
@inline(never)
func castitExistential<ObjectType>(_ o:C?, _ t:ObjectType.Type)->ObjectType?{
return o as?ObjectType
}
Casts.test("cast optional<nsobject> to protocol"){
iflet obj =castit(nil,P.self){
print("fail")
expectUnreachable()
}else{
print("success")
}
}
Casts.test("cast optional<nsobject> to protocol meta"){
iflet obj =castit(nil,P.Type.self){
print("fail")
expectUnreachable()
}else{
print("success")
}
}
Casts.test("cast optional<protocol> to protocol"){
iflet obj =castitExistential(nil,P.self){
print("fail")
expectUnreachable()
}else{
print("success")
}
}
Casts.test("cast optional<protocol> to class"){
iflet obj =castitExistential(nil,Foo.self){
print("fail")
expectUnreachable()
}else{
print("success")
}
}
Casts.test("cast optional<protocol> to protocol meta"){
iflet obj =castitExistential(nil,P.Type.self){
expectUnreachable()
print("fail")
}else{
print("success")
}
}
Casts.test("cast optional<protocol> to class meta"){
iflet obj =castitExistential(nil,Foo.Type.self){
expectUnreachable()
print("fail")
}else{
print("success")
}
}
@objcpublicclassParentType:NSObject{
vara=LifetimeTracked(0)
}
publicclassChildType:ParentType{
}
structSwiftStructWrapper{
vara=LifetimeTracked(0)
}
extensionSwiftStructWrapper:_ObjectiveCBridgeable{
typealias_ObjectiveCType=ParentType
func _bridgeToObjectiveC()->_ObjectiveCType{
returnParentType()
}
staticfunc _forceBridgeFromObjectiveC(
_ source:_ObjectiveCType,
result:inoutSelf?
){}
@discardableResult
staticfunc _conditionallyBridgeFromObjectiveC(
_ source:_ObjectiveCType,
result:inoutSelf?
)->Bool{returnfalse}
@_effects(readonly)
staticfunc _unconditionallyBridgeFromObjectiveC(_ source:_ObjectiveCType?)
->Self{
returnSwiftStructWrapper()
}
}
Casts.test("testConditionalBridgedCastFromSwiftToNSObjectDerivedClass"){
autoreleasepool{
lets=SwiftStructWrapper()
letz= s as?ChildType
print(z)
}
expectEqual(0,LifetimeTracked.instances)
}
protocolQ{}
classK{}
classD:Q{}
typealiasAnyQ=Q&AnyObject
typealiasKQ=K&Q
Casts.test("testCastProtocolCompoWithAnyObjectToProtocolCompoTypeSuperclass"){
letshouldBeNil=(D()asAnyQ)as?KQ
expectNil(shouldBeNil)
}
protocolQAny:AnyObject{}
typealiasKQAny=K&QAny
classF:QAny{}
Casts.test("testCastProtocolWithAnyObjectToProtocolCompoTypeSuperclass"){
letshouldBeNil=(F()asQAny)as?KQAny
expectNil(shouldBeNil)
}
func f1()->Any{return1}
func attemptFunctionCast<U>(_ u:U.Type)->U?{
return f1 as?U
}
Casts.test("testFunctionCastToArchetype"){
expectNil(attemptFunctionCast(Int.self))
expectNil(attemptFunctionCast(K.self))
expectTrue(attemptFunctionCast(Any.self)!=nil)
}