public static member function
<string>
static int_type not_eof(const int_type& c);
static constexpr int_type not_eof(int_type c) noexcept;
Not End-of-File character
Returns a value that is guaranteed to not be an End-of-File.
If c is not an End-of-File character, it always returns c unchanged. Otherwise, some implementation-defined value that is not an End-of-File character.
All character traits types shall implement the function so that the returned value compares different from eof() using member eq_int_type.
参数
c
Value.
成员类型int_type是一个整数类型，可以表示 eof() 或任何有效的字符值。
返回值
c if c is not an End-of-File value, and some other value otherwise.
成员类型int_type是一个整数类型，可以表示 eof() 或任何有效的字符值。