C++: dynamically allocating a member array of structs using non-default constructor

Question

If I have:

struct a_struct
{
    int an_int;

    a_struct(int f) : an_int(f) {}
    a_struct() : an_int(0) {}
};

class a_class
{
    a_struct * my_structs;         


        

Answer 1

You can't do it directly on any particular parameterized constructor. However you can do,

a_struct *my_struct[10] = {}; // create an array of pointers

for (int i = 0; i < 10; i++)
    my_struct[i] = new a_struct(i); // allocate using non-default constructor

When you're going to de-allocate the memory,

for (int i = 0; i < 10; i++)
    delete my_struct[i]  // de-allocate memory

I suggest using a std::vector container instead of going through this process.