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8c92db82 MessageCallback: Remove unused bool& argument bcee24ae Use `std::function` for callbacks Acked-by: Kitware Robot <kwrobot@kitware.com> Acked-by: vvs31415 <vstakhovsky@fastmail.com> Acked-by: Daniel Pfeifer <daniel@pfeifer-mail.de> Merge-request: !2872
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