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std::char_traits<CharT>::not_eof

static int_type not_eof( int_type e );
(until C++11)
static constexpr int_type not_eof( int_type e ) noexcept;
(since C++11)

Given e, produce a suitable value that is not equivalent to eof.

Formally.

  • if X::eq_int_type(e, X::eof()) is false, returns e
  • otherwise, returns a value f such that X::eq_int_type(f, X::eof()) is false

This function is typically used when a value other than eof needs to be returned, such as in implementations of std::basic_streambuf::overflow().

Parameters

e - value to analyze

Return value

e if e and eof value are not equivalent, returns some other non-eof value otherwise.

Complexity

Constant.

See also

[static]
returns an eof value
(public static member function)

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https://en.cppreference.com/w/cpp/string/char_traits/not_eof