Changing my array definitions to Vectors or Lists?

Question

According to that question, I'm more and more worried about the management of the memory in my project, and my program would crash when there is somewhere a conflict in one of the array memories.

The different answers to this posted question have converged to the fact that I would change my arrays to Vectors and some of my arrays are defined as below:

#define Nb 50
int position[Nb];
double indication[Nb];
double sum[Nb];

how to change each one of them to

 std::vector
 std::list?

Can we manipulate / process them when changing their declaration (organizing them in ascending order for example or overwriting one of the values) ?

Answer 1

You are using fixed size arrays,

#define Nb 50
int position[Nb];

the modern C++ alternative to these is std::array, not std::vector:

std::array<int, 50> position;

std::vector is a dynamically sized array, whose size can be determined at runtime and can change after construction.

int n;
std::cin >> n;
std::vector<int> v(n); // vector has n value constructed ints
v.push_back(42); // v has n+1 ints now.

C++14 offers std::dynarray, which is a dynamically sized array, whose size can be determined at runtime but cannot be changed after construction.

Answer 2

The Syntax is as follows:

#define Nb 50
std::vector<int> position(Nb); // create std::vector holding ints, Initial size is 50

You should also refrain from using #define, but rather use const, this is more C++:

const int Nb = 50; //maybe wrap Nb in a namespace
 std::vector<int> position(Nb);

See vector and its constructors.