为我的基于文本的 RPG 游戏制作库存时遇到困难

Question

So I created an Inventory class, wrote some codes and when I compiled the program I got this error:

no match for 'operator=' (operand types are 'std::basic_ostream::__ostream_type {aka std::basic_ostream}' and 'Item*')|

Here is the code:

Inventory.h file

#include <iostream>
#include <vector>
#ifndef INVENTORY_H
#define INVENTORY_H
#include "Item.h"

using namespace std;

class Inventory
{
    public:
        Inventory(unsigned capacity = 10);
        Inventory(const Inventory* other);
        ~Inventory();

        Item **items;

        unsigned totalItems;
        unsigned capacity;

        void initialize(const unsigned from = 0);
        void expand();
        void insertItem(const Item& item);
        void removeItem(const unsigned index);
        void clearInventory();

    protected:

    private:
};

#endif

Inventory.cpp file

#include "Inventory.h"

Inventory::Inventory(unsigned capacity)
{
    this->capacity = capacity;
    totalItems = 0;
    items = new Item*[capacity];

    initialize();
}

Inventory::Inventory(const Inventory* other)
{
    this->capacity = other->capacity;
    this->totalItems = other->totalItems;

    this->items = new Item*[this->capacity];

    initialize();

    for(size_t i = 0; i < this->totalItems; i++)
    {
        cout << this->items[i] = new Item(*other->items[i]);
    }
}

Can someone tell me what i did wrong?

Answer 1

Try this:

 cout << (this->items[i] = new Item(*other->items[i]));

Looks like the << operator takes precedence in this case, so this expression is evaluated from left to right as:

cout << this->items[i]    // which is an ostream

then you try to assign that new Item() to that ostream, so the = operator sees ostream on the left and *Item on the right.