"std_lib_facilities.h" showing error
There is an updated version of that file that works fine for the most recent revision of the ISO/IEC 14882 standard, namely C++17.
https://github.com/BjarneStroustrup/Programming-_Principles_and_Practice_Using_Cpp/blob/master/std_lib_facilities.h
You don't need that line:
#include<iostream>
Hope you have not quit learning C++ with that wonderful book!
we should not use this file "std_lib_facilities.h" at all as it is using deprecated or antiquated headers.
You should #include
standard headers as you use them. The std_lib_facilities.h
might get out of sync.
#include<iostream>
#include "std_lib_facilities.h"
int main() {
std::cout<<"Hello world";
}
should rather be
#include<iostream>
// #include "std_lib_facilities.h" Remove this entirely!
int main() {
std::cout<<"Hello world";
}
Using more standard features like std::string
should be:
#include<iostream>
#include<string>
int main() {
std::string hello = "Hello world";
std::cout<<hello;
}
Extending further, reading the #include std_lib_facilities.h
in your books example should probably become to expand the actually necessary standard header includes for your compilable and productive code.
Here's just a default starting template as used by Coliru
#include <iostream>
#include <vector>
template<typename T>
std::ostream& operator<<(std::ostream& os, const std::vector<T>& vec)
{
for (auto& el : vec)
{
os << el << ' ';
}
return os;
}
int main()
{
std::vector<std::string> vec = {
"Hello", "from", "GCC", __VERSION__, "!"
};
std::cout << vec << std::endl;
}
Sure you could gather up the
#include <iostream>
#include <vector>
in a separate header file, but that would be tedious to keep in sync of what you need in particular with all of your translation units.
Another related Q&A:
Why should I not #include <bits/stdc++.h>?