C++: creating multiple data structures using a for loop - c++

Question

I have a program where I use records of the form:
// declaring a struct for each record
struct record
{
int number; // number of record
vector<int> content; // content of record
};
Within main I then declare each record:
record batch_1; // stores integers from 1 - 64
record batch_2; // stores integers from 65 - 128
Where each batch stores 64 integers from a list of numbers (in this instance from a list of 128 total numbers). I would like to make this program open ended, such that the program is capable of handling any list size (with the constraint of it being a multiple of 64). Therefore, if the list size was 256 I would need four records (batch_1 - batch_4). I am not sure how I can create N-many records, but I am looking for something like this (which is clearly not the solution):
//creating the batch records
for (int i = 1; i <= (list_size / 64); i++)
{
record batch_[i]; // each batch stores 64 integers
}
How can this be done, and will the scope of something declared within the for loop extend beyond the loop itself? I imagine an array would satisfy the scope requirement, but I am not sure how to implement it.

Answer 1

Like many suggested in the comments why not use a resizable vector provided by the C++ Standard Library: std::vector?
So, instead of having this:
record batch_1; // stores integers from 1 - 64
record batch_2; // stores integers from 65 - 128
.
.
record batch_n // Stores integers x - y
Replace with:
std::vector<record> batches;
//And to create the the batch records
for (int i = 1; i <= (list_size / 64); i++) {
record r;
r.number = i;
r.content = ....;
batches.push_back(r);
// You could also declare a constructor for your record struct to facilitate instantiating it.
}

Answer 2

Why don't you try this
// code
vector<record> v(list_size / 64);
// additinal code goes here
Now,you can access your data as follow
(v[i].content).at(j);