Question

我目前正在学习2类编程（c ++），我们受命制作基于文本的rpg。我将此post用作库存系统的参考，因为我认为它非常有效。但是我一直遇到E0349“没有运算符“ ==”或“ <<”与这些操作符匹配“错误。

如果有人可以帮助我，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
  }
}

错误消息

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

Answer 1

Equipment[i]是类型Item的对象。如果您没有提供将对象与"Empty"进行比较的方法，则编译器将不知道如何在行中进行比较

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

比较属性

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

或者您必须提供一种方法。同样的问题

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

编译器不知道如何打印对象。您必须为此提供功能。

您可以

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;
}

如果要使用运算符，则必须为它们重载。

基于C ++文本的RPG库存系统

1 个答案: