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Medium
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In C++14, copying instances of the following class ```c++ class String { String(std::size_t l) : len(l) , ptr(std::make_unique<char[]>(l+1)) {} public: String(char const* s) : String(std::strlen(s)) { std::copy_n(s, len + 1, ptr.get()); } private: std::size_t len; std::unique_ptr<char[]> ptr; }; void somewhere() { String s1 = "foo"; String s2 = s1; } ```

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Lucat Jan 6, 2026
Expert
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Copying instances of the following class ```c++ class String { String(std::size_t l) : len(l) , ptr(new char[l + 1]) {} public: String(char const* s) : String(std::strlen(s)) { std::copy_n(s, len + 1, ptr); } ~String() { delete[] ptr; } private: std::size_t len; char* ptr; }; void somewhere() { String s1 = "foo"; String s2 = s1; } ```

Back-end developer
Lucat Jan 6, 2026
Hard
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Copying instances of the following class ```c++ class String { public: String(char const* s) : str(s) {} private: std::string str; }; void somewhere() { String s1 = "foo"; String s2 = s1; } ```

Back-end developer
Lucat Jan 6, 2026