How do I redefine a class's function outside of the class - c++

Question

class Function
{
public:
std::string Name;
void call(std::string x);
Function(std::string Nam)
{
Name = Nam;
}
};
std::vector<Function> funcs;
void Load_FuncLib()
{
Function print("print");
Function add("add");
print.call(std::string x)
{
std::cout<< x <<"\n";
}
add.call(std::string x)
{
std::cout<< std::stoi(x) + std::stoi(x) << "\n";
}
funcs.push_back(print);
funcs.push_back(add);
funcs.at(0).call("Hello world");
}
I want it to run the function print.call("Hello world"); but it will not work as I don't know how to set a function, which is already declared, nor do I know how to call it using a vector.

Answer 1

You most likely want to achieve something like this?
#include <unordered_map>
#include <iostream>
#include <string>
#include <functional>
int main() {
std::unordered_map<std::string, std::function<void (const std::string&)>> funcs;
funcs["print"] = [](const std::string& str) {
std::cout << str << '\n';
};
funcs["add"] = [](const std::string& str) {
int i = std::stoi(str);
std::cout << i + i << '\n';
};
funcs["print"]("Hello, World!");
funcs["add"]("12");
}
https://ideone.com/Ke4aEK
At any time you can reset a certain value of the hash map with another function.
Also, depending on your needs, you may use std::function or just plain function pointers.