How to reference an object based on its value

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I'm looking for a way to reference the items within my game based on their values.

C++

class item() {
     item();
     ~item();
     item(string name)
     private:
          string name;
}

item sword("sword");

vector<string> inventory;
inventory.pushback(sword.name);

While the code above is probably full of errors, it represents the concepts. Is there a way to reference the item sword from its name value in the inventory vector? Or would I have to use pointers? If so, how would I do that?

Thanks!

What I have tried:

Looking around the internet for ways to do this.

Posted 13-Sep-23 0:44am

Brennon Nevels

Updated 13-Sep-23 7:05am

Deeksha Shenoy

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Richard MacCutchan · Accepted Answer · 2023-09-13T01:17:00

That does not make a lot of sense. Your item class contains only a single property which is a string. And your vector contains only strings. So how could an element of that vector refer back to the item?

You probably need to use a std::map - cppreference.com[^] type to keep track of things.

But that is largely a guess as it is not clear what exactly you are trying to do.

CPallini · Accepted Answer · 2023-09-13T02:05:00

(If I got you) You might use a std::unordered_map too look-up items by their name property.
E.g.

C++

#include <iostream>
#include <unordered_map>
using namespace std;

class Item
{
  string name;
  int value;
  //...
public:
  Item(){}
  Item(string name, int value):name{name},value{value}{}
  string get_name(){ return name; };
  int get_value() { return value; };
  //...
  void show() const
  {
    cout << name << " " << value;
  }
  //...
};


int main()
{

  unordered_map<string, Item> inventory;

  inventory.emplace("foo", Item{"foo", 100});
  inventory.emplace("boo", Item{"boo", 20});
  inventory.emplace("goo", Item{"goo", -50});

  const auto & item_boo = inventory.at("boo"); // retrieve a reference of the Item by its name.
  item_boo.show(); cout << "\n";

  const auto & item_bar = inventory.at("bar"); // this is doomed to fail: no "bar" in your inventory...
  item_bar.show(); cout << "\n";
}

How to reference an object based on its value

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