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An unsigned integer type with the same size and alignment as uint_least32_t, which is therefore large enough to hold a UTF-32 code unit.

const char32_t full_house[] = U"πŸ‚£πŸ‚³πŸ‚¨πŸ‚ΈπŸƒˆ";                  // non-BMP characters
std::cout << sizeof(full_house) / sizeof(char32_t) << "\n"; // prints 6

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