What about them makes you want them removed?
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Right, but that puts the owness on the user to know he has to make this copy() call. When writing a generic array class, you're likely going to memcpy. Or you'll provide a copy function to the array class. Or have an overloaded copy() function all classes must do.
At what point are you asking just a language-supported copy operator? (thought I guess copy assignments still exist, it's mostly a matter of whether the destination has valid initial values)
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Rust has a Copy trait that you can opt into. That seems fine and could be the type of things you'd add as a consequence after you've removed the constructors. But if not.. eh, no big deal. Just write C like code. Can't copy if you only have a Foo* and don't know the size!
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sizeof(Foo)? I suppose with a copy operator opt-in and default initialization, I can see constructors going the way of the dodo.
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