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#feature on safety #include <cstdint> template<typename T> class Vec { public: void push_back(T value) % safe; const T% operator[](size_t idx) const % safe; T% operator[](size_t idx) % safe; }; void f2(Vec<float>% vec, float% x) safe { // Does push_back potentially invalidate x? // No! Exclusivity prevents vec and x from aliasing. vec.push_back(7); // Okay to store to x, because it doesn't point into vec's data. *x = 7; } int main() safe { Vec<float> vec { }; mut vec.push_back(1); // Ill-formed: mutable borrow of vec between its mutable borrow and its use f2(mut vec, mut vec[0]); }
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