In VC, you may find that you can use "size_t" directly without including any headers. size_t i = 0; int main() { atexit(0); } However, "size_t" is not a built-in type. It is a typedef in <stddef.h>. So what's the magic? In VC compiler, it...

C++ supports in-class initialization of static integral constant members. It is nearly the same as enum, with the following difference (quoted from C++03 9.4.2.4 ([class.static.data])): The member shall still be defined in a namespace scope if it is...

In C++, only a few characters can be used as part of the identifier. identifier: identifier-nondigit identifier identifier-nondigit identifier digit identifier-nondigit: nondigit universal-character-name other implementation-defined characters nondigit...