Hi,

I've been trying to set up a list variable in a C++ header file and I'm getting the error:

Here's the header file code:

The error is caused at the line with red text.

Anyone got any idea why this is so? I'm clueless at the moment.

You're not including the header required for lists... #include <list>

Hmm, I added it and it seems working now.

But shouldn't it work without the include considering I'm using the "std" namespace and the list library is part of the "std" namespace?

"using namespace foo" isn't the same thing as including a header. When you do #include <list>, you tell the compiler to read the header file which contains the implementation of the STL List. "using namespace" is more of a convenience thing. The STL List is defined within std namespace, so if you don't have "using namespace std" if your code, you have to use "std::list" instead of "list".

BTW, is having a list of connections static a good idea here? I of course have no idea what your intentions are, but do you really want to have a common list of connections for all instances of class Server?

I set it to static so I can access Server::Conns from every other class.

It's handy because the list will be used in pretty much every other class I have.

In that case, wouldn't it be better to make the server object global and access it like that or share a pointer to it?

Quote from MadCatX :

In that case, wouldn't it be better to make the server object global and access it like that or share a pointer to it?

I'm a complete uber nub in C++ so this was the first way that I thought of, and it worked

I see, but abusing the staticness of class members is generally considered a bad practice in any language. In C++ you might be better off doing it like this:

Option 1 - global variable (bad idea too)

Option 2 - shared variable (much better)