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Showing content from https://www.cplusplus.com/char_traits::eof below:

public static member function

<string>

static constexpr int_type eof() noexcept;

End-of-File character

The End-of-File value is a special value used by many standard functions to represent an invalid character; Its value shall not compare equal to any of the values representable with char_type (as if transformed with member int_type and compared with member eq_int_type).

For the standard specializations of char_traits it returns:

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// char_traits::eof
#include <iostream>   // std::wcin, std::wcout
#include <string>     // std::wstring, std::char_traits

int main () {
  std::wcout << "Please enter some text: ";

  if (std::wcin.peek() == std::char_traits<wchar_t>::eof()) {
    std::wcout << "Reading error";
  }
  else {
    std::wstring ws;
    std::getline (std::wcin,ws);
    std::wcout << "You entered a word: " << ws << '\n';
  }

  return 0;
}

char_traits::not_eof

Not End-of-File character (public static member function)

EOF

End-of-File (constant)

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