A move-only class is a class that can be moved but cannot be copied. To explore this type of class, let's wrap std::unique_ptr, which itself is a move-only class, in the following example:
class the_answer{ std::unique_ptr<int> m_answer;public: explicit the_answer(int answer) : m_answer{std::make_unique<int>(answer)} { } ~the_answer() { if (m_answer) { std::cout << "The answer is: " << *m_answer << '\n'; } }public: the_answer(the_answer &&other) noexcept { *this = std::move(other); } the_answer &operator=(the_answer &&other) noexcept { m_answer = std::move(other.m_answer); return *this; }};
The preceding class stores std::unique_ptr as a member variable and, on construction, instantiates the memory variable with an integer ...
