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#feature on safety template<typename Key, typename Value> class Map { public: // Lifetime elision rules constrain the return by self. auto get1(self^, const Key^ key) safe -> Value^; // Use explicit parameterizations for alternate constraints. auto get2/(a)(self^/a, const Key^/a key) safe -> Value^/a; }; int main() safe { Map<float, long> map { }; // Bind the key reference to a materialized temporary. // The temporary expires at the end of this statement. long^ value1 = mut map.get1(3.14f); // We can still access value, because it's not constrained on the // key argument. *value1 = 1001; // The call to get2 constrains the returned reference to the lifetime // of the key temporary. long^ value2 = mut map.get2(1.6186f); // This is ill-formed, because get2's key argument is out of scope. *value2 = 1002; }
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