std::is_integer<T>不存在.

话虽这么说，std::numeric_limits<T>::is_integer确实存在.

That being said, std::numeric_limits<T>::is_integer does exist.

我不知道std::numeric_limits<T>::is_integer和std::is_integral<T>之间的任何显着差异.后者的设计要晚得多，并且在C ++ 11中成为标准，而前者是在C ++ 98中引入的.

I'm not aware of any significant difference between std::numeric_limits<T>::is_integer and std::is_integral<T>. The latter was designed much later and became standard in C++11, whereas the former was introduced in C++98.