Member variable pointer to self in C++

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When I try to compile the code below I get an error?

class A {
 private:
    static A* Aptr[5];
 public:
    static int A_count;
    A() {
        Aptr[A_count] = this;
    }
};

int A::A_count = 0;

int main() {
    A a_;
    A b_;
    return 0;
}

Using g++ I get the following error:

/tmp/ccrp4BGg.o: In function `A::A()':
try.cpp:(.text._ZN1AC2Ev[_ZN1AC5Ev]+0x18): undefined reference to `A::Aptr'
collect2: error: ld returned 1 exit status

Why?

asked 29 secs ago

user1135541

124