Why can I use fixed-width integers without the cstdint header?

[Nyap]

is cstdint #included somewhere in iostream? because for some reason, this compiles perfectly on my laptop (gcc-4.9 with -std=c++14)

#include <iostream>
//no #include <cstdint>

int main()
{
    int32_t test{};
    std::cout << test;
    return 0;
}

 

[Nyap]

I just tried using fixed-width integers without iostream, and they're still there:

is this a new feature in c++14?

--------------------- MERGED ---------------------------

yeah, after doing a bit more research, it appears that iostream must #include cstdint somewhere