What is move() in c++98? [closed]

#include <iostream>
#include <vector>
using namespace std;

int main(void){

 vector<int> a;
 a.push_back(3);
 vector<int> b = move(a);
 cout<<"b: "<<b.data()<<endl;
 cout<<"a: "<<a.data()<<endl;

 return 0;
}

Output(in c++98):

b: 0x7f9a82405730

a: 0x7f9a82405720

Output(in c++11):

b: 0x7f9a82405730

a: 0x0

I am using clang.

No compiler flags are used for the second output.

-std=c++11 flag for the second output.

I know what move() does in c++11 (and higher versions). But as I can see using move() in c++98 does nothing to the object passed and just deep copy happens.

Then why is there a move() in c++98??