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The fact that you have to ask that question makes GP's point. There's no way to tell that from looking at a function's interface at present.

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Why? If all standard functions that take no ownership/keep references are using raw pointers then it behaves same as user code/C++ devs expect: if a function is taking a pointer then it claims no ownership. You take a look at standard_function(T*) and see raw pointer and then can assume it is not taking ownership or keeping references

The fact that you don't have an answer make's GP's point. This isn't actually a problem with the standard library because the semantics are clear.

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