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BoundFunction is an alias for std::function<>. Copying a function object may be expensive. Use std::move() to avoid copying std::function<>. From https://engdoc.corp.google.com/eng/doc/devguide/cpp/std_function.md: "Generally prefer both accepting and passing by value if ownership is transferred. Recall that when using value semantics, it's important to also use std::move() when appropriate." Bug: 203462310 Change-Id: I9fb87737dd5ce0fbb84bfbbdb0f8bb952dea1fbc Signed-off-by: Bart Van Assche <bvanassche@google.com>