How can I use and modify the s_member private static variable from the constructor or in general from an other member function?
This is what I tried.
a.h:
#ifndef A_H
#define A_H
#include <set>
class A
{
public:
A();
virtual ~A();
private:
static std::set<int> s_member;
};
#endif
a.cpp:
#include "a.h"
A::A()
{
A::s_member.insert(5); // It causes error.
}
I get this error:
/tmp/ccBmNUGs.o: In function `A::A()': a.cpp:(.text+0x15): undefined
reference to `A::s_member' collect2: error: ld returned 1 exit status
You have declared A::s_member but not defined it yet. To define it, put below code, outside of class:
std::set<int> A::s_member;
For example:
std::set<int> A::s_member;
A::A()
{
// ...
}
The problem is not related to accessing and private/public.
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