#include <iostream>
using namespace std;

struct A {
    A() {
        printf("A() calledn");
    }

    A(int i, int j) {
        printf("A(%d, %d) calledn", i, j);
    }
};

struct B {
    A tab[100];

    B(int i, int j) {
        // I would like to call A(i, j) for each tab entries instead of the default constructor
        printf("B(%d, %d) calledn", i, j);
    }
};

int main() {
    B b(1, 7);
    return 0;
}

struct B {
    A tab[100];

    template<size_t... Is>
    B(int i, int j, std::index_sequence<Is...>) : tab{ {(void(Is), i), j }... } {}

    B(int i, int j) : B(i, j, std::make_index_sequence<100>()) {}
};