What's wrong with this c++ code?

Question

My C++ is a bit rusty so...

#include<list>
typedef list<int> foo;

that gives me the oh so nice error message:

test.cpp:2: syntax error before `;' token

What the heck can I even Google for in that...

Answer 1

The names of the C++ Standard library are in namespace std

#include <list>
typedef std::list<int> foo;

Answer 2

list<> is in the STD namespace. This should work fine:

#include<list>
typedef std::list<int> foo;

Answer 3

You are expecting the list to be in global namespace. But is defined inside std namespace. Hence either you should use using namespace std; or expliictly specify the namespace as std::list; I personally prefer the second option.

Answer 4

Alternatively you could do,

#include<list>
using namespace std;
typedef list<int> foo;

if you don't want to type std:: everywhere.