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// RUN: %empty-directory(%t)
// RUN: %target-build-swift -O -module-name=test %s -o %t/a.out
// RUN: %target-codesign %t/a.out
// RUN: %target-run %t/a.out | %FileCheck %s
// REQUIRES: executable_test,optimized_stdlib
final class Storage {
var v : Int
init(_ v : Int) {
self.v = v
}
}
struct IntBox {
var s : Storage
init(_ x : Int) {
s = Storage(x)
}
var value: Int { return s.v }
mutating func increment(_ delta: Int) {
if (!isKnownUniquelyReferenced(&s)) {
// We should never see this message
print("## copy on write")
s = Storage(s.v)
}
s.v += delta
}
}
enum E {
case value(IntBox)
case none
@inline(never)
mutating func simpleIncrement() {
switch self {
case .value(var i):
i.increment(1)
self = .value(i)
case .none:
break
}
}
}
func test_enum() {
// CHECK: test_enum() simpleIncrement start
print(#function, "simpleIncrement start")
var e1 = E.value(IntBox(27))
e1.simpleIncrement()
// CHECK-NEXT: test_enum() simpleIncrement end: 28
switch e1 {
case .value(let i):
print(#function, "simpleIncrement end:", i.s.v.description)
case .none:
print("none")
}
}
test_enum()
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