Frank Saez Comments - Answer Overflow

Frank Saez

•Created by tcorpse on 7/4/2024 in #questions

UnsafePointer & Structs

I've tried this

@value
struct Test(Stringable):
    
    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: Self):
        self.label = label
        self.prev = UnsafePointer[Test](prev)


    fn __str__(self) -> String:
        return "Test: " + self.label

    fn next(self, label: String) -> Self:
        return Test(label, self)

fn main():

    var x = Test("x")
    var y = x.next("y")
    var z = y.prev[]
    print(x)
    print(y)
    print(z)

@value
struct Test(Stringable):
    
    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: Self):
        self.label = label
        self.prev = UnsafePointer[Test](prev)


    fn __str__(self) -> String:
        return "Test: " + self.label

    fn next(self, label: String) -> Self:
        return Test(label, self)

fn main():

    var x = Test("x")
    var y = x.next("y")
    var z = y.prev[]
    print(x)
    print(y)
    print(z)

and it gives me :

Test: x
Test: y
Test: x

Test: x
Test: y
Test: x

I guess the difference is in :

self.prev = UnsafePointer[Test](prev)

self.prev = UnsafePointer[Test](prev)

6 replies

MModular

•Created by Frank Saez on 6/12/2024 in #questions

FFI

thanks. BOLT doesn't work, at least on my setup, that's why I've asked. I've got this error :

BOLT-ERROR: function reordering only works when relocations are enabled

BOLT-ERROR: function reordering only works when relocations are enabled

It's usually solved with something like "-Wl,--emit-relocs" in the LDFLAGS. but it's no big deal, really.

16 replies

MModular

•Created by Frank Saez on 6/12/2024 in #questions

FFI

another question but I guess I know the answer. Any plan for LTO/PGO/BOLT ? BOLT could be the easier to enable as it usually rely on a LDFLAGS.

16 replies

MModular

•Created by Frank Saez on 6/12/2024 in #questions

FFI

thanks. I'm "plumbing" Mojo with the libjpeg and I'll dive into MLIR after that

16 replies

MModular

•Created by Frank Saez on 6/12/2024 in #questions

FFI

thanks. I've already found this and it's why I've asked for a "clean and official" way 😋

16 replies

MModular

•Created by Frank Saez on 6/12/2024 in #questions

FFI

yeah, I've start to feel the pain with this. I've found nothing to convert to/from Int and even a basic & doesn't seems to exist 😋 Guess, it will be Int for now

16 replies

MModular

•Created by Frank Saez on 6/12/2024 in #questions

FFI

thanks. It should be UInt since size_t is supposed to be unsigned

16 replies

MModular

•Created by Frank Saez on 6/5/2024 in #questions

Question about iterating a list of strings

@FSaez good to know, thanks.

14 replies

MModular

•Created by Frank Saez on 6/5/2024 in #questions

Question about iterating a list of strings

thanks !

14 replies

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