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So is drop like free, or is it something else?
by e_proxus 7y ago
So is drop like free, or is it something else?
- cyphar 7y agoYes, it's effectively like free -- though C++'s "auto" is probably a closer idea. The main difference to C's free is that you simply cannot double-free a value (without using unsafe). That's because a value is only dropped when it falls out of scope -- and since it values only have one owner (and references must not outlive values) there cannot be any dangling references after it's dropped. The documentation for std::mem::drop is explaining that dropping a value is a property of the language and scoping rules -- thus there is nothing for the function to do other than take a value and let it go out of scope.
- pixel_fcker 7y agoIt’s more like delete in c++ because you can implement the Drop trait for a type in order to run code when it is dropped in order to clean up resources etc.
- kzrdude 7y agoDrop is just what runs when a value goes out of scope. Like destructors in C++.