OnlineGDB

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main.cpp

// Example program #include <iostream> #include <string> #include <optional> #include <memory> class A { public: A(int v): val{v} {} int val; }; class B { public: B(std::shared_ptr<A>& a): a{a} {} const std::shared_ptr<A> a; }; int main() { std::shared_ptr<A> a = std::make_shared<A>(3); std::optional<B> b; b = std::make_optional<B>(a); }

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