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std::char_traits::eof(3)      C++ Standard Libary     std::char_traits::eof(3)

NAME
       std::char_traits::eof - std::char_traits::eof

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

http://cppreference.com		  2022.07.31	      std::char_traits::eof(3)

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