Differences between std::is_integer and std::is_integral?

Question

C++11 provides two type trait template classes: std::is_integer and std::is_integral. However, I cannot tell the differences between them.

Answer 1

The difference is that std::is_integral will only recognize decimal integers including bool char char16_t char32_t wchar_t short int long long long. While std::numeric_limits::is_integer will recognize all of those aswell as float double. Look at these two pages for more information: is_integer, is_integral