Step 5 of 8

Non-copyable classes

Sometimes copying makes no sense (a file handle, a network socket, a unique game session). Say so explicitly with = delete, and the compiler rejects any attempt to copy:

class Session {
public:
    Session(const Session&) = delete;
    Session& operator=(const Session&) = delete;
};

Your turn: make Lock non-copyable. The tests check it at compile time with std::is_copy_constructible_v.

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