关于本章
本章讨论C++中如何query type。C++中，分为static type和dynamic type，因此，C++对它们分别提供了operator:
| operator | 章节 | |
|---|---|---|
| 查询静态类型 | decltype |
./decltype |
| 查询动态类型 | typeid | ./typeid |
stackoverflow 'typeid' versus 'typeof' in C++
C++ language has no such thing as typeof. You must be looking at some compiler-specific extension. If you are talking about GCC's typeof, then a similar feature is present in C++11 through the keyword decltype. Again, C++ has no such typeof keyword.
typeid is a C++ language operator which returns type identification information at run time. It basically returns a type_info object, which is equality-comparable with other type_info objects.