C++ 基于文本的 RPG 库存系统

Question

我目前正在上编程 2 类(class) (c++)，我们的任务是制作一个基于文本的角色扮演游戏。我正在使用这个 post作为我的库存系统的引用，因为我认为它非常有效。但我一直遇到 E0349“没有运算符“==”或“<<”匹配这些操作数”错误。

如果有人能帮助我，那就太好了。这是我的全套代码:

#include "pch.h"
#include <iostream>
#include <fstream>
#include <iomanip>
#include <vector>
#include <ostream>
#include <Windows.h>
#include <string>
#include <cctype>
using namespace std;

  struct Item {
    string name; //Item name.
    int slot; //Head, Torso, Hands
    int attack;
    int knowledge;
    int defense;
    int hp;
    int speed;
    int charisma;
  };

int main()
{

    //Variables, Strings, etc.
    int itemcounter = 0, counter = 0;


    //"Empty" Item
    Item Empty{ "<Empty>", 0, 0, 0 };

    vector<Item> Equipment = { 6, Empty }; //Current Equipment, 6 empty slots.
    vector<Item> Inventory = { }; //Player Inventory.
    string InventorySlots[] = { "Head" "Torso", "Hands" }; //Player parts where items can be equiped.

    cout << "You sit your bag down and take a look inside." << " You have:" << endl;

    for (int i = 0; i < itemcounter; i++)
    {
        cout << InventorySlots[i];
        if (Equipment[i] == "Empty ")
        {
        cout << " " << Equipment[i] << endl << endl;
      }
    }

}

这里是我的错误更具体的地方

for (int i = 0; i < itemcounter; i++)  //Display equipped
{
    cout << InventorySlots[i];
    if (Equipment[i] == "Empty ") //Error Here
    {
    cout << " " << Equipment[i] << endl << endl; //Errore Here
  }
}

错误信息

Error (active)  E0349   no operator "<<" matches these operands     C:\Users\USER\source\repos\clunkinv\clunkinv\clunkinv.cpp   47

Answer 1

Equipment[i] 是 Item 类型的对象。如果您不提供将您的对象与 "Empty" 进行比较的方法，编译器将不知道如何在行中进行比较

if (Equipment[i] == "Empty ")

要么你比较属性

if (Equipment[i].name == "Empty ")

或者你必须提供一个方法。同线问题

cout << " " << Equipment[i] << endl << endl;

编译器不知道如何打印你的对象。您必须为此提供一个函数。

你可以

struct Item {
    string name; //Item name.
    int slot; //Head, Torso, Hands
    int attack;
    int knowledge;
    int defense;
    int hp;
    int speed;
    int charisma;
};

std::ostream &operator<<(std::ostream &os, const Item& item) {
    os << item.name;
    return os;
}

如果你想使用它们，你必须为你的类重载运算符。