Using initializer list initialized member values in other member constructors

Looking at the following class definition:

class MyClass
{
public:
    int value;
    std::vector<int> container{value, value}; //vector initialized using member
    
    MyClass(size_t v) : value(v){} //initialize value in initializer list
  
};

int main(){

    MyClass obj(10);
    
    for(auto& i : obj.container){   //this works as expected
            std::cout << i << " ";
    }
}

The member value is initialized in the initializer list, and it's used in the initializer list constuctor of a std::vector member.

The initialization works as expected, std::vector is initialized with two member whose value is that of value member.

Of course I could simply do this:

MyClass(size_t v) : value(v), container{value, value}{}

But that's not the point.

I'd assume there are rules that govern this situation but I've not been able to find them.

The question is, is that construct correct? How can I be sure value is initialized before the vector?