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by hechang1997
2340 days ago
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This article does a great job explaining the subtleties about rust closures. A subtle point often missed is that if you want the anonymous structure of your closure itself to own a value, so that you can have a closure with a `'static` lifetime (which lives forever) that still could be called multiple times, you must use move keyword. If you just move the values into the closure manually, your closure will be a `FnOnce` since the compiler will mistakenly believe that you want to move that value each time the closure gets invoked, which can only happen once if the moved value doesn't implement `Copy`. In constrast, if you use the `move` keyword, compiler will correctly move the value into the anonymous structure of the closure itself during its construction, and the closure will be a `FuMut` and/or `Fn` as long as you don't consume the said value in the closure. |
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