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c++ - 如何在 C++ 中创建一个作为另一个类的 vector 的类?

转载 作者:搜寻专家 更新时间:2023-10-31 01:30:40 24 4
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感谢阅读我的问题。

我正在尝试开始编写一个使用一副纸牌的程序,因为我想了解如何使用类。我决定创建一个存储西装和值的类,如下所示:

#ifndef CARD_H
#define CARD_H

class Card {
public:
//here are the individual card values
int _suit;
int _value;
Card(int suit, int value);
};

#endif
#include "card.h"

//define suits
const int spades = 0;
const int clubs = 1;
const int hearts = 2;
const int diamonds = 3;
//define face cards
const int jack = 11;
const int queen = 12;
const int king = 13;
const int ace = 14;

Card::Card(int suit, int value){
_suit = suit;
_value = value;
}

然后我决定创建一个牌组类,并在该类中通过分配 0-3(花色)的值和 2-14(牌的排名)的值来初始化我的纸牌。我还将卡片添加到我定义的用于保存它们的 vector 中,如下所示:

#ifndef DECK_H
#define DECK_H

#include <vector>

class Deck {
public:
std::vector<Card> _deck(51);
Deck();
};

#endif
#include <iostream>
#include <vector>

#include "card.h"
#include "deck.h"

const int all_suits = 4 - 1;
const int all_values = 14;

Deck::Deck(){
int i = 0;
for (int j = 0; j <= all_suits; ++j) {
//begin with 2 because card can't have value 0
for (int k = 2; k <= all_values; ++k) {
_deck[i] = Card(j, k);
++i;
}
}
}

当我尝试像这样测试程序时,这不知何故给我带来了问题:

#include <iostream>
#include <vector>

#include "card.h"
#include "deck.h"

int main() {
Deck new_deck = Deck();
std::cout << new_deck._deck[4]._value;
return 0;
}

当我尝试运行代码时出现以下错误:

In file included from main.cpp:6:
./deck.h:8:27: error: expected parameter declarator
std::vector<Card> _deck(51);
^
./deck.h:8:27: error: expected ')'
./deck.h:8:26: note: to match this '('
std::vector<Card> _deck(51);
^
main.cpp:22:24: error: reference to non-static member function must be called; did you mean to call it with no arguments?
std::cout << new_deck._deck[4]._value;
~~~~~~~~~^~~~~
()
3 errors generated.
In file included from deck.cpp:8:
./deck.h:8:27: error: expected parameter declarator
std::vector<Card> _deck(51);
^
./deck.h:8:27: error: expected ')'
./deck.h:8:26: note: to match this '('
std::vector<Card> _deck(51);
^
deck.cpp:18:4: error: reference to non-static member function must be called; did you mean to call it with no arguments?
_deck[i] = Card(j, k);
^~~~~
()
3 errors generated.

老实说,我不太确定发生了什么。我非常关注我在网上看到的一个类(class)示例。如果有人可以帮助我找到问题所在,将不胜感激。对不起,我对此有点陌生,可能犯了一些愚蠢的错误。非常感谢您花时间和耐心阅读本文并帮助我。

最佳答案

你的问题在于_deck的声明:

class Deck {
public:
std::vector<Card> _deck(51);

在这里您试图声明 _deck 并调用构造函数,但您不能从类成员初始化器中这样做。可以为没有构造函数的数据成员执行此操作,例如:

class Deck {
public:
int no_of_cards = 51;
std::vector<Card> _deck;

您将需要使用您的构造函数来初始化 _deck(就像您已经在做的一样:

Deck::Deck() {
_deck.reserve(51);
int i = 0;
for (int j = 0; j <= all_suits; ++j) {
//begin with 2 because card can't have value 0
for (int k = 2; k <= all_values; ++k) {
_deck.push_back(Card(j, k));
++i;
}
}
}

并将您的 _deck 声明保留为:

class Deck {
public:
std::vector<Card> _deck;

关于c++ - 如何在 C++ 中创建一个作为另一个类的 vector 的类?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/47298962/

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