operator==,!= (std::istream_iterator<T, CharT, Traits, Dist>)

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定义于头文件 `<iterator>`
template < class T, class CharT, class Traits, class Dist > bool operator == ( const std:: istream_iterator < T, CharT, Traits, Dist > & lhs, const std:: istream_iterator < T, CharT, Traits, Dist > & rhs ) ;	(1)
template < class T, class CharT, class Traits, class Dist > bool operator ! = ( const std:: istream_iterator < T, CharT, Traits, Dist > & lhs, const std:: istream_iterator < T, CharT, Traits, Dist > & rhs ) ;	(2)	(C++20 前)
friend bool operator == ( const istream_iterator & i, std:: default_sentinel_t ) ;	(3)	(C++20 起)

检查 lhs 和 rhs 是否相等。两个流迭代器在以下情况下被视为相等：两者都是流结束迭代器，或者两者都引用同一个流。

1) 检查 lhs 是否等于 rhs 。

2) 检查 lhs 是否 不等于 rhs 。

3) 检查 lhs 是否为流结束迭代器。
此函数对普通无限定查找或限定查找不可见，仅当 std::istream_iterator<T, CharT, Traits, Dist> 作为实参的关联类时，才能通过实参依赖查找找到。

!= 运算符由 operator== 合成。

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istream_iterator::istream_iterator
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istream_iterator::operator* istream_iterator::operator->
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operator== operator!= (until C++20)

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operator==,!= (std::istream_iterator<T, CharT, Traits, Dist>)

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