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?

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[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.