Can someone explain this please

[EwCjE3v7]

Hi there,
Why do i get this error for auto, i am reading c++ primer 5th edition with is rewritten for c++11 and i get this? thanks

  #include <iostream>

int main()
{
    int i = 0, &r = i;
    auto a = r;
    return 0;
}

error: auto changed meaning in C++11


Edit:
FIXED IT!
Just tick -std=c++11 in codeblocks by Setting Compiler and check the box
sry should have done more research before posting

[Protomega]

Interesting, I just placed the code in my IDE (VS2012 November 2012 CTP) and it worked perfectly fine.. Can we get information of what environment you are in?

edit: Good! Thanks posting your solution!

[EwCjE3v7]

I don't know what the problem was but after some research I tried this and it worked. I'm using Mingw.
And thanks for the reply :).