UnsafePointer & Structs
would anyone be able to help me understand what is happening here? why are the outputs of the two print statements different?
The output is:
@value
struct Test:
var prev: UnsafePointer[Test]
var label: String
fn __init__(inout self, label: String):
self.label = label
self.prev = UnsafePointer[Test]()
fn __init__(inout self, label: String, prev: Test):
self.label = label
self.prev = UnsafePointer[Test].address_of(prev)
fn __str__(self) -> String:
return "Test: " + self.label
fn next(self, label: String) -> Test:
return Test(label, self)
fn main():
var x = Test("x")
print(x.next("y").prev[])
var y = x.next("y")
print(y.prev[])@value
struct Test:
var prev: UnsafePointer[Test]
var label: String
fn __init__(inout self, label: String):
self.label = label
self.prev = UnsafePointer[Test]()
fn __init__(inout self, label: String, prev: Test):
self.label = label
self.prev = UnsafePointer[Test].address_of(prev)
fn __str__(self) -> String:
return "Test: " + self.label
fn next(self, label: String) -> Test:
return Test(label, self)
fn main():
var x = Test("x")
print(x.next("y").prev[])
var y = x.next("y")
print(y.prev[])The output is:
Test: x
Test:Test: x
Test:
