Question

我是C ++编程语言的新手。这段代码是我在Visual Studio中执行的一个简单的字符串复制功能，但它没有按照我期望的方式工作。

// main file
int _tmain(int argc, _TCHAR* argv[])
{   
    char source[] = { "Computer" };
    int sourcelength = strlen(source);
    printf("Source = %s", source);
    char* destination = new char[sourcelength];
    StringCopyFn(destination, source); // error is on this line
    printf("Source = %s", source);  
    scanf_s("Hello World"); 
    return 0;
}

// String Copy
StringCopyFn::StringCopyFn()
{
}

void StringCopy(char* destination, char* source)
{
    int i = 0;

    while (source[i] != '\0')
    {
        destination[i] = source[i];

        i++;
    }
}

StringCopyFn::~StringCopyFn()
{
}

我收到以下错误消息：

没有构造函数的实例匹配参数列表

如何更正此错误？

Answer 1

这是StringCopyFn构造函数：

StringCopyFn::StringCopyFn()
{
}

请注意，它需要零参数。

但基于此代码：

StringCopyFn(destination, source);

您似乎打算调用StringCopy()函数。从你为什么创建StringCopyFn类的问题中不清楚。

Answer 2

也许，你打算做以下事情：

#include <cstdio>
#include <cstring>
#include <TCHAR.h>

class StringCopyFn {
public:
    static void StringCopy(char *destination, char *source);
};

void StringCopyFn::StringCopy(char* destination, char* source){
    int i = 0;

    while( source[i] != '\0' ){
        destination[i] = source[i];

        i++;
    }
    destination[i] = '\0';
}

int _tmain(int argc, _TCHAR* argv[]){
    char source[] = { "Computer" };
    int sourcelength = strlen(source);
    printf("Source = %s", source);
    char* destination = new char[sourcelength+1];
    StringCopyFn::StringCopy(destination, source);
    printf("\ndestination = %s\n", destination);
    scanf_s("Hello World"); 
    delete [] destination;
    return 0;
}

或

#include <cstdio>
#include <cstring>
#include <TCHAR.h>

struct StringCopyFn {
public:
    void operator()(char *destination, char *source){
        int i = 0;

        while( source[i] != '\0' ){
            destination[i] = source[i];

            i++;
        }
        destination[i] = '\0';
    }
};

int _tmain(int argc, _TCHAR* argv[]){
    char source[] = { "Computer" };
    int sourcelength = strlen(source);
    printf("Source = %s", source);
    char* destination = new char[sourcelength+1];
    StringCopyFn()(destination, source);
    printf("\ndestination = %s\n", destination);
    scanf_s("Hello World"); 
    delete [] destination;
    return 0;
}

没有构造函数的实例匹配参数列表

2 个答案: