I don't get this

Code:

#include "Project1App.h"
#include "Project1Frm.h"
#include <string>
string n;

IMPLEMENT_APP(Project1FrmApp)


bool Project1FrmApp::OnInit()
{
    Project1Frm* frame = new Project1Frm(NULL);
    SetTopWindow(frame);
    frame->Show();
    return true;
}

int Project1FrmApp::OnExit()
{
	return 0;
}

Error: 15 C:\wxdevcpp\proiecte\1st\Project1App.cpp `string' does not name a type

I'm trying to declare a vector visible outside the wx implementation, but that did not work, so i cam back to an int. It worked, char worked, but string and any other standard class, doesn't. This is so annoying. I almost thought I got the smallest hang of C++.

Maybe std::string?

oh. what's std, and what does :: do?

std is a namespace, which is particular to C++ and not in the C language.

Namespaces are essentially a way to group data and functions under a unique name. This gets rid of the problem of having name collisions which are a compiler error. the std namespace incorportates functions and data from the Standard Template Library (STL). The :: operator is called the scope-resolution operator and explicity tells the compiler what class or namespace you want to use.

Instead of writing out "std::string" everytime, consider adding a line "using std::string;" at the top. Some people use "using namespace std;" to import the whole namespace, but many others don't like that idea.

Hmm, sounds like a pretty smart addition to the basic C. I'll have to experiment with it. Thanks!