std::char_traits<CharT>::eof

From cppreference.com
< cpp‎ | string‎ | char traits
static int_type eof();
(until C++11)
static constexpr int_type eof() noexcept;
(since C++11)

Returns a value not equivalent to any valid value of type char_type.

Formally, returns a value e such that X::eq_int_type(e, X::to_int_type(c)) is false for all values c.

Parameters

(none)

Return value

A value not equivalent to any valid value of type char_type.

Complexity

Constant.

See also

[static]
checks whether a character is eof value
(public static member function)