#include <iostream>
#include <memory>
using namespace std;

class A {
public:
    int *data;

    A(int *d) : data(d) {
        throw runtime_error("err");
    }
};

class B {
public:
    int *data2;
    A *a;

    B()
    try : data2(new int[10]), a(new A(new int[2])) {}
    catch (exception e) {
       // delete[] data2;
        //delete a;
    }
};


int main() {
    B b;
}