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Last active June 22, 2020 14:26
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FB7746024.md

FB7746024

Memory leak in Combine when using Concatenate with MergeMany

When you concatenate two publishers, one of which is a merge, you will get a leak reported in Xcode’s memory graph debugger.

The publisher can be as simple as:

self.cancellable = Publishers.Concatenate(
  prefix: Empty<Int, Never>(completeImmediately: true),
  suffix: Publishers.MergeMany(Empty(completeImmediately: true))
)
  .print()
  .sink { _ in }

I have a project attached that shows the problem. Simply launch the application and open the memory graph debugger to see the leaks. The pertinent code is in the SceneDelegate.

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