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Returns the end-of-file (EOF) character.

static int_type eof();

The EOF character.

A value that represents end of file (such as EOF or WEOF).

The C++ standard states that this value must not correspond to a valid char_type value. The Visual C++ compiler enforces this constraint for type char, but not for type wchar_t. The example below demonstrates this.

// char_traits_eof.cpp
// compile with: /EHsc
#include <string>
#include <iostream>

int main()
    using namespace std;

    char_traits<char>::char_type ch1 = 'x';
    char_traits<char>::int_type int1;
    int1 = char_traits<char>::to_int_type(ch1);
    cout << "char_type ch1 is '" << ch1 << "' and corresponds to int_type "
         << int1 << "." << endl << endl;

    char_traits<char>::int_type int2 = char_traits<char>::eof();
    cout << "The eof marker for char_traits<char> is: " << int2 << endl;

    char_traits<wchar_t>::int_type int3 = char_traits<wchar_t>::eof();
    cout << "The eof marker for char_traits<wchar_t> is: " << int3 << endl;
char_type ch1 is 'x' and corresponds to int_type 120.

The eof marker for char_traits<char> is: -1
The eof marker for char_traits<wchar_t> is: 65535

Header: <string>

Namespace: std