Unable to deserialize object

[srozb]

Hi,
I was trying to serialize and deserialize bloom filter object, and deserialization gives me the following error during the compilation:

flatty-0.3.4/flatty.nim(171, 23) Error: for a 'var' type a variable needs to be passed; but 'uint64(x.capacity)' is immutable

code causing the issue is:

proc importFlatty*(srcPath: string): Bloom =
  result = srcPath.readFile().fromFlatty(Bloom)

and it works perfectly the opposite way (toFlatty).

Is that a bug or me doing something wrong?

[treeform]

This looks like a bug. Could you provide a small example to reproduce this? You might need to include the bloom filter import in the same file as the code that is doing the deserialization. Some times Nim is confusing with imports.

On Thu, Sep 22, 2022, at 3:02 AM, srozb wrote: Hi, I was trying to serialize and deserialize bloom filter object <https://github.com/dizzyliam/flower/blob/main/src/flower.nim#L17>, and deserialization gives me the following error during the compilation: `flatty-0.3.4/flatty.nim(171, 23) Error: for a 'var' type a variable needs to be passed; but 'uint64(x.capacity)' is immutable

`

…

code causing the issue is: proc importFlatty*(srcPath: string): Bloom = result = srcPath.readFile().fromFlatty(Bloom) and it works perfectly the opposite way (`toFlatty`). Is that a bug or me doing something wrong? — Reply to this email directly, view it on GitHub <#34>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AAA6X7EC2ACXKX6RL6BNPKTV7QVFHANCNFSM6AAAAAAQS4IFWI>. You are receiving this because you are subscribed to this thread.Message ID: ***@***.***>

[srozb]

Here's the minimal example:

import flower, flatty

var 
  bloom = newBloom(10, 0.01)
  bl = fromFlatty(toFlatty(bloom), Bloom)

nim c -r test.nim
/Users/slawek/tmp/bloombug/test.nim(5, 18) template/generic instantiation of `fromFlatty` from here
/Users/slawek/.nimble/pkgs/flatty-0.3.4/flatty.nim(291, 4) template/generic instantiation of `fromFlatty` from here
/Users/slawek/.nimble/pkgs/flatty-0.3.4/flatty.nim(171, 23) Error: for a 'var' type a variable needs to be passed; but 'uint64(x.capacity)' is immutable

Tested with flatty [0.3.4] and flower [1.0.0]. Imports included in the same file.

[treeform]

Thank you for your issue. I have been working on flatty for a bunch of things, and I think I have fixed this in this PR: #52

Feel free to re-open the issue if it still happens to you.