动态拼接字符串

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  工作中有时候需要传入不定个数的字符串，就需要专门写一个函数动态添加字符串，下面看下函数：

#include <iostream>
#include <cstring>
#include "stdarg.h"

std::string append(int count,const char* msg, ...){
    std::string srcStr;
    va_list vaList;
    va_start(vaList, msg);
    char tmp[1024] = {0};
    int n = 0;
    int true_count = count -1;
    strcat(tmp,msg);

    while(1)
    {
        strcat(tmp,"_");
        strcat(tmp,va_arg(vaList,char*));

        n++;
        if(n == true_count)
        {
            printf("%d\n",n);
            break;
        }
    }
    va_end(vaList);//结束可变参数列表
    std::string stmp(tmp);
    srcStr += stmp;

    return srcStr;
}

int main(){
    //string
    std::string str1 = "12";
    std::string str2 = "34";
    std::string str3 = "56";
    std::string src = append(3,str1.c_str(),str2.c_str(),str3.c_str());

    std::cout <<  src << std::endl;

    return 0;
}

经测试好用。