c++中的静态变量，静态指针，静态类指针，静态类对象使用和原理

#include"iostream"using namespace std;class s{class test{public:static int a;static int *b;test(){printf("构造函数\n");}~test(){printf("析构函数\n");}void add(){printf("ok %d %d\n",a,*b);}};public:static test t; //这2个东西怎么初始化static test *t1;};s::test* s::t1=new s::test(); //调用构造s::test s::t;//调用构造int s::test::a=10;int* s::test::b=new int(15);int main(int argc, char const *argv[]){s::t.add();s::t1->add();cout<<"hello"<<endl;return 0;}