# std::char_traits<CharT>::not_eof

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< cpp‎ | string‎ | char traits

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

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

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