字符串向量不传递到类功能

String vectors not passing to a class function

本文关键字：功能 向量 字符串      更新时间：2023-10-16

我在传递向量，作为参数到类函数时遇到一些问题。类在另一个文件中。这是我的代码：

main.cpp：

#include <iostream>
#include <vector>
#include <string>
#include "class1.h"
using namespace std;
int main() {
    vector<string> names;
    names.push_back("Bob");
    names.push_back("Gorge");
    names.push_back("Bill");
    names.push_back("Freddy");
    names.push_back("Daniel");
    names.push_back("Emily");

    class1 obj;
    obj.printVector(names);
    system("pause");
}

class1.h：

#pragma once
class class1
{
public:
    void printVector(std::vector<string>& names);
};

class1.cpp：

#include <string>
#include "class1.h"
using namespace std;
void class1::printVector(vector<string>& names) {
    for (unsigned int i = 0; i < names.size(); i++)
    {
        cout << names[i] << endl;
    }
}

我尝试使用其他数据类型（int，char，floats ...）做同样的事情，并且它起作用。同样，当我将它们传递到main中的功能时。错误是：

- Severity  Code    Description Project File    Line    Suppression State
Error   C3203   'allocator': unspecialized class template can't be used as a template argument for template parameter '_Alloc', expected a real type    tesst   c:users...documentsprograms and gamestessttesstclass1.h  6
- Severity  Code    Description Project File    Line    Suppression State
Error   C3203   'allocator': unspecialized class template can't be used as a template argument for template parameter '_Alloc', expected a real type    tesst   c:users...documentsprograms and gamestessttesstclass1.h  6
- Severity  Code    Description Project File    Line    Suppression State
Error   C2923   'std::vector': 'string' is not a valid template type argument for parameter '_Ty'   tesst   c:users...documentsprograms and gamestessttesstclass1.h  6   
- Severity  Code    Description Project File    Line    Suppression State
Error   C2923   'std::vector': 'string' is not a valid template type argument for parameter '_Ty'   tesst   c:users...documentsprograms and gamestessttesstclass1.h  6   
- Severity  Code    Description Project File    Line    Suppression State
Error   C2065   'string': undeclared identifier tesst   c:users...documentsprograms and gamestessttesstclass1.h  6   
- Severity  Code    Description Project File    Line    Suppression State
Error   C2065   'string': undeclared identifier tesst   c:users...documentsprograms and gamestessttesstclass1.h  6   
- Severity  Code    Description Project File    Line    Suppression State
Error   C2664   'void class1::printVector(std::vector &)': cannot convert argument 1 from 'std::vector<std::string,std::allocator<_Ty>>' to 'std::vector &' tesst   c:users...documentsprograms and gamestessttesstmain.cpp  22  
- Severity  Code    Description Project File    Line    Suppression State
Error   C2511   'void class1::printVector(std::vector<std::string,std::allocator<_Ty>> &)': overloaded member function not found in 'class1'    tesst   c:users...documentsprograms and gamestessttesstclass1.cpp    9

请帮忙！谢谢

class1.h不包括 <string>或 <vector>.

您是在包含class1.h之前恰好将<string>包含在源文件中的事实，这是前者的遗漏（不是您应该依靠的！）。

在后一种情况下，class1.cpp根本不知道 vector的含义。

修复您的包含。

您的问题不是将参数传递给类。以下代码在这里工作：

#include <iostream>
#include <vector>
#include <string>
using namespace std;
class class1 {
public:
    void printVector(std::vector<string>& names);
};
void class1::printVector(vector<string>& names) {
    for (unsigned int i = 0; i < names.size(); i++)
    {
        cout << names[i] << endl;
    }
}
int main() {
    vector<string> names;
    names.push_back("Bob");
    names.push_back("Gorge");
    names.push_back("Bill");
    names.push_back("Freddy");
    names.push_back("Daniel");
    names.push_back("Emily");

    class1 obj;
    obj.printVector(names);
        return 0;
}

如前所述，轨道上的轻度竞赛，您的问题不包括向量和字符串到Class1

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