将类对象放在向量内? [英] Placing a class object inside a vector?
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问题描述
我注意到我可以在一个向量中放置一个类;这里是我的程序,其中我收到以下错误:
I noticed that I can place a Class inside a vector; here is my program, where I am receiving the following error:
/out:blackjack.exe
blackjack.obj
blackjack.obj : error LNK2019: unresolved external symbol "private: static class
std::vector<class Card,class std::allocator<class Card> > Card::Cards" (?Cards@
Card@@0V?$vector@VCard@@V?$allocator@VCard@@@std@@@std@@A) referenced in functio
n "public: static void __cdecl Card::blankCard(void)" (?blankCard@Card@@SAXXZ)
blackjack.exe : fatal error LNK1120: 1 unresolved externals
问题出现在`blankcard()函数中,我试图创建一个新的类实例,并将其放入向量。
The issue is inside the `blankcard() function, where I'm trying to create a new class instance, and put it into the vector.
有人可以阅读代码告诉我我的问题,给我一个很好的例子,如何做到这一点?谢谢。
Can someone please read the code tell me my issue and give me a good example in how to do this? Thank you.
#include <iostream>
#include <vector>
#include <string>
using namespace std;
class Card
{
private:
string suit;
int number;
static vector<Card> Cards;
public:
Card::Card();
Card::Card(string cardS, int cardV);
static void createCards();
static void blankCard();
};
int main()
{
Card::blankCard();
return 0;
}
Card::Card(){};
Card::Card(string cardS, int cardV){};
void Card::blankCard()
{
int temp = 1;
int cardValue;
string suit;
int suitCount = 1;
for(int i = 1; i < 52; i++)
{
if(temp == 1 || temp > 13)
{
temp = 1;
cardValue = temp;
temp ++;
}
else if(temp > 1)
{
cardValue = temp;
temp ++;
}
if(suitCount <= 13)
{
suit = "spade";
suitCount++;
}
else if( suitCount >= 14 && suitCount <= 26)
{
suit = "club";
suitCount++;
}
else if(suitCount >= 27 && suitCount <= 39)
{
suit = "heart";
suitCount++;
}
else if(suitCount >= 40 && suitCount <= 52)
{
suit = "diamonds";
suitCount++;
}
Card a = Card(suit, cardValue);
Cards.push_back(a);
}
}
推荐答案
正在声明类定义中的静态成员 Cards
,但是你没有在任何地方定义它。在类定义之后添加一个定义:
You are declaring the static member Cards
inside the class definition, but you aren't defining it anywhere. Add a definition after the class definition:
vector<Card> Card::Cards;
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