'access private member' error

[AngreGanon]

Hi, all~ ^^

If i use #1 OK, but use # 2 error happend what's different?

#include <iostream>
/* -----------# 1------------
using std::endl;
using std::cout;
using std::ostream;
*/------------------------------

//-------------# 2--------------
using namespace std; //error!!! ' x' : cannot access private member
declared in class 'Point'

class Point
{
private:
int x;
public:
Point(int _x=0):x(_x){}
friend ostream& operator<<(ostream& os, const Point& p);
};

ostream& operator<<(ostream& os, const Point& p)
{
os<<"["<<p.x<<"]"<<endl;
return os;
}

int main(void)
{
Point p;
cout << p;
return 0;
}

[Ian Collins]

An********@gmail.com wrote:

Hi, all~ ^^

If i use #1 OK, but use # 2 error happend what's different?

#include <iostream>
/* -----------# 1------------
using std::endl;
using std::cout;
using std::ostream;
*/------------------------------

//-------------# 2--------------
using namespace std; //error!!! ' x' : cannot access private member
declared in class 'Point'

Are you sure? There doesn't look to be anything wrong with the code
(except the indentation!)

Which compiler, where exactly is the error?

<snip>

--
Ian Collins.

[AngreGanon]

tool is MS visual studio c++ 6.0

error message

Compiling...
test2.cpp
test2.cpp(20) : error C2248: 'x' : cannot access private member
declared in class 'Point'
test2.cpp(12) : see declaration of 'x'
test2.cpp(27) : error C2593: 'operator <<' is ambiguous
Error executing cl.exe.

[Ian Collins]

An********@gmail.com wrote:

tool is MS visual studio c++ 6.0

That's probably your problem, upgrade to a decent compiler. Or dop all
the using nonsense and qualify the names.

error message

Compiling...
test2.cpp
test2.cpp(20) : error C2248: 'x' : cannot access private member
declared in class 'Point'
test2.cpp(12) : see declaration of 'x'
test2.cpp(27) : error C2593: 'operator <<' is ambiguous

Being an old compiler, its library probably has ostream outside of the
std namespace as well as inside.

--
Ian Collins.

[AngreGanon]

I did on Linux C++ compiler.

Good~! no error. ^^

Thank you~