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by zozbot234
882 days ago
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> Rust and C++ work very similarly with respect to objects you own. There is one major difference. In Rust you can memcpy objects you own to a different base address and they will still work, unless they're pointed at by a Pin<> type (as such, code that requires objects to stay put in memory must take a Pin<> reference. This arrangement may potentially be replaced by a special "?Move" trait in future editions of Rust). C++ pins all objects by default and allows objects to have custom "move" constructors, to sort of enable them to be moved elsewhere. In C++, objects that get "moved" must leave behind something that can be destructed cleanly; Rust has no such limitation, at least wrt. ordinary moves. Arguably the closest thing it has to a C++ move is the .take() pattern, which leaves a default-constructed object behind. But this is rarely used. The general tradeoff is that the Rust pattern memcpy's compound objects more often, but has less gratuitous use of the heap and less pointer chasing compared to idiomatic C/C++. This is a valid choice once one has the compiler support that Rust provides. |
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