c++ - Why is there no cdirent or sys/cstat -

i writing c++ code iterates through entries of directory , decided use dirent.h. since using c++, decided use c++ standard including c library files [i.e. prefixing library name c , removing .h @ end]

without adding functionality decided compile program once see if there cdirent or sys/cstat. g++ threw error telling me these files not present

#include <iostream> #include <cdirent> #include <sys/cstat> #include <sys/ctypes>  using namespace std;  int main() {  }  dummy.cpp:2:19: error: cdirent: no such file or directory dummy.cpp:3:21: error: sys/cstat: no such file or directory dummy.cpp:4:22: error: sys/ctypes: no such file or directory 

following advice given in page on standard c++ header files locate cstdio, cstdlib, ctime , brings me questions

1. when c standard library file converted c++ standard library file?
2. how should 1 include such files in program? page here talks standard , non standard header files. believe dirent.h standard library file [correct me if wrong]

thanks in advance suggestions

dirent.h , sys/stat.h posix/sus headers rather standard c/c++ headers, , such not adhere standard c++ rules.