c++ - vector 迭代器不兼容错误

Question

我在运行时遇到 vector 迭代器不兼容错误。它发生在代码部分的最后一行，在 for 循环内 (humans.push_back( Human(&deck, (*iter)) );)当我第一次收到错误时，我错误地使用了与“iter”不同的迭代器，因此运行时错误完全是有道理的。但现在我更改了它并重新编译了所有内容(我仔细检查过)，我仍然收到此错误。

void BlackjackGame::getHumansAndHouse()
{
    // asks how many players, pushes_back vector accordingly, initializes house, checking for valid input throughout
    string input;
    vector<string> names;
    while(true)
    {
        cout << "How many humans? (1 - 7)" << endl;
        cin >> input;
        if(!isdigit(input[0]))
            cout << "Invalid input. ";
        else
        {
            input.erase(1);
            int j = atoi(input.c_str());
            for(int i = 1; i <= j; i++)
            {
                while(true)
                {
                    cout << "Enter player " << i << " name: ";
                    cin >> input;
                    if(strcmp(input.c_str(), "House") == 0)
                        cout << "Player name has to be different than 'House'." << endl;
                    else
                    {
                        names.push_back(input);
                        break;
                    }
                }
            }
            break;
        }
    }
    vector<string>::iterator iter;
    for(iter = names.begin(); iter != names.end(); iter++)
        humans.push_back( Human(&deck, (*iter)) );

    house = House(&deck);
}

人类是一个 vector :

vector<Human> humans;

其中 Human 是一个类，其构造函数如下:

Human(Deck *d, string n) : Player(d), name(n) { printNameCardsAndTotal(); }

(Human是Player的派生类)

因为 iter 是一个字符串 vector 的迭代器，我不明白为什么我在 for 循环内的那一行得到了不兼容的 vector 迭代器。我并不是想直接对人类使用 iter。

错误在这里:

humans.push_back( Human(&deck, (*iter)) );

Answer 1

错误出现在您没有显示的代码中。以下代码是我根据您的代码和您的描述编写的，不会产生任何错误:

#include <vector>
#include <string>
#include <iostream>
#include <cstdlib>
#include <cstring>
#include <cctype>

using namespace std;

class Deck
{
};

class Player()
{
  public:
    Player(Deck *d) {}
};

class Human : public Player
{
  public:
    Human(Deck *d, string n) : Player(d), name(n) {}
  private:
    string name;
};

class House
{
  public:
    House(Deck *d) {}
};

int main()
{
    Deck deck;
    vector<Human> humans;
    string input;
    vector<string> names;
    while(true)
    {
        cout << "How many humans? (1 - 7)" << endl;
        cin >> input;
        if(!isdigit(input[0]))
            cout << "Invalid input. ";
        else
        {
            input.erase(1);
            int j = atoi(input.c_str());
            for(int i = 1; i <= j; i++)
            {
                while(true)
                {
                    cout << "Enter player " << i << " name: ";
                    cin >> input;
                    if(strcmp(input.c_str(), "House") == 0)
                        cout << "Player name has to be different than 'House'." << endl;
                    else
                    {
                        names.push_back(input);
                        break;
                    }
                }
            }
            break;
        }
    }
    vector<string>::iterator iter;
    for(iter = names.begin(); iter != names.end(); iter++)
        humans.push_back( Human(&deck, (*iter)) );

    House house = House(&deck);
    return 0;
}