Answer 1

Not 100% sure what you're going for, but here's how I understand it:

class ClassWithArray {

public:
ClassWithArray() {

_array = nullptr;

}
~ClassWithArray() {

if (_array)
delete _array;

}
void Set(std::initializer_list<int> values) {

_array = new int[values.size()];

int index = 0;
for (auto i = values.begin(); i != values.end(); ++i)
_array[index++] = *i;

}

private:
int* _array;

};

The you would use it like:

ClassWithArray obj;
obj.Set({ 1, 2, 3 });