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// Copyright (c) 2014 - 2020 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
//
// RUN: %target-run-simple-swift | %FileCheck %s
// REQUIRES: executable_test
// REQUIRES: objc_interop
import Foundation
// Test to make sure that empty collections don't cause a crash if we smuggle
// them into the ObjC runtime without doing anything that would trigger
// realization. The ObjC runtime expects all classes to have been realized
// (i.e. runtime data structures initialized, triggered the first time a class
// is accessed or used) before being queried in any way.
//
// Note: this test deliberately avoids StdlibUnittest to make sure
// no other code runs that might inadvertently trigger realization behind our
// back.
@objc protocol P {}
if #available(SwiftStdlib 5.3, *) {
do {
let d: [NSObject: NSObject] = [:]
let c: AnyClass? = object_getClass(d)
let conforms = class_conformsToProtocol(c, P.self)
print("Dictionary: ", conforms) // CHECK: Dictionary: false
}
do {
let a: [NSObject] = []
let c: AnyClass? = object_getClass(a)
let p = objc_getProtocol("NSObject")
let conforms = class_conformsToProtocol(c, p)
print("Array:", conforms) // CHECK: Array: false
}
do {
let s: Set<NSObject> = []
let c: AnyClass? = object_getClass(s)
let p = objc_getProtocol("NSObject")
let conforms = class_conformsToProtocol(c, p)
print("Set:", conforms) // CHECK: Set: false
}
} else {
// When testing against an older runtime that doesn't have this fix, lie.
print("Dictionary: false")
print("Array: false")
print("Set: false")
}
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