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I see that you have no experience with C++ in the past decade. There has been no fragmentation in C++ resource management since C++11.

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That's fair - last time i used C++ in earnest was around 2007. Unless they broke compatibility, it would still be opt-in, though, right? Nice thing about Rust is that the resource management approach is built-in and enforced by default.

Everything in C++ is opt-in.

The Standard C++ Library supports user-managed allocators for all the containers, heavily used in embedded, low-latency, and real-time applications to get deterministic performance.

Lack of standard support for user-provided allocators indicates immaturity. E.g., C++ lacked them until 2011.

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