Retrieve array name - c++

Question

I have written a function in c++ which receives a struct as a input. The struct object received has two arrays. I need to use both the arrays for different purposes. The array names have been created in a certain format. How to retrieve array names in a string.
struct INFO
{
float fADataLHS[3] = {1,2,3};
float fADataRHS[3] = {4,5,6};
Struct INFO has been defined where two arrays have been defined an initialized. The function useStruct uses both the function for different purposes.
void useStruct(struct *INFO)
{
--------;
--------;
}
int main()
{
struct INFO info;
useStruct(info);
}
I want a method in which I can retrieve the name of the array as for ex. fAdataLHS and store it to a string. The idea is to find the sub-string LHS and RHS from the string names and process then accordingly.
PS: I am quite new to c++.

Answer 1

I will go simple as you're a begginer to C++.
If you want to use both of arrays for different purposes, just doit. For instance:
void use_array_for_different_purposes(INFO *info)
{
// Purpose one, printing values using fADataLHS.
for (int i = 0; i < 3; i++) {cout << info->fADataLHS[i] << endl;}
// Purpose two, computing total sum using fADataRHS.
int acum;
for (int i = 0; i < 3; i++) {acum += info->fADataRHS[i];}
}
As you can see, you don't need to get the arrays names as strings values.

Answer 2

If I understand corectly, your use case is this: you have two (or more) names and each has a float array associated with it. You want to get the array by name and process the data.
Consider this code:
class INFO
{
std::map<std::string, std::vector<float>> vectors;
public:
INFO() : vectors{}
{
vectors["fADataLHS"] = { 1, 2, 3 };
vectors["fADataRHS"] = { 4, 5, 6 };
}
const std::vector<float>& operator[](const std::string& key) const // access vector by key
{
return vectors.at(key);
}
};
void useStruct(const INFO& info) // pass instance by const reference
{
std::cout << info["fADataLHS"][0] << "\n"; // access element 0 from the fADataLHS array
// get the entire array:
const auto& arr = info["fADataRHS"];
// this will throw a std::out_of_bounds
const auto& arr = info["non-existent-key"];
}
EDIT: A few other notes:
in C++ try not to use float - use double instead
if you need to alter the vector contents from client code, add a non-const version of the operator[]