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

eof [static]

returns an eof value (public static member function)