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 could allocate a raw chunk of memory and use placement new to initialize each struct:

int number_of_structs = 10;
my_structs = (a_struct*)new unsigned char[sizeof(a_struct) * number_of_structs];
     // allocate a raw chunk of memory 
a_struct* p = m_structs;
for (int i=0; i

See also: What uses are there for "placement new"?