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C++20 const mismatch with defaulted copy constructor

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const mismatch with defaulted copy constructor
https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/p0641r2.html
C++ 20 이전 /usr/include/c++/7/tuple: In instantiation of ‘struct std::_Head_base<0, NonConstCopyable, true>’: /usr/include/c++/7/tuple:343:12: required from ‘struct std::_Tuple_impl<0, NonConstCopyable>’ /usr/include/c++/7/tuple:556:11: required from ‘class std::tuple<NonConstCopyable>’ <span class="error_line" onclick="ide.gotoLine('main.cpp',19)">main.cpp:19:30</span>: required from here /usr/include/c++/7/tuple:82:17: error: ‘constexpr std::_Head_base<_Idx, _Head, true>::_Head_base(const std::_Head_base<_Idx, _Head, true>&) [with long unsigned int _Idx = 0; _Head = NonConstCopyable]’ declared to take const reference, but implicit declaration would take non-const constexpr _Head_base(const _Head_base&) = default;
C++ 20 이후

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C++20 const mismatch with defaulted copy constructor

  • 1. const mismatch with defaulted copy constructor
  • 3. C++ 20 이전 /usr/include/c++/7/tuple: In instantiation of ‘struct std::_Head_base<0, NonConstCopyable, true>’: /usr/include/c++/7/tuple:343:12: required from ‘struct std::_Tuple_impl<0, NonConstCopyable>’ /usr/include/c++/7/tuple:556:11: required from ‘class std::tuple<NonConstCopyable>’ <span class="error_line" onclick="ide.gotoLine('main.cpp',19)">main.cpp:19:30</span>: required from here /usr/include/c++/7/tuple:82:17: error: ‘constexpr std::_Head_base<_Idx, _Head, true>::_Head_base(const std::_Head_base<_Idx, _Head, true>&) [with long unsigned int _Idx = 0; _Head = NonConstCopyable]’ declared to take const reference, but implicit declaration would take non-const constexpr _Head_base(const _Head_base&) = default;