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It uses a lot of unsafe rust code. Here an example https://github.com/rust-qt/examples/blob/master/widgets/basi...

I'm not sure what's the advantage of using unsafe code everywhere in Rust compared to just using C/C++. The syntax?

Even for unsafe code Rust was designed to be more ergonomic than C (like pointer arithmetic operations). That said a safe wrapper would be preferred to unsafe everywhere.

Being part of a bigger Rust project? The GUI is just one component after all.

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