c++ 产生不重复独有文件名

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#include <iostream>
#include <cstdio>
#include <string>

int main()
{
    int pos;
    std::string fileName;
    std::string final;
	for(int i = 0; i < 10; i++)
	{
	    std::string name = std::tmpnam(nullptr);
    	pos = name.find_last_of('/');
   	 	fileName = name.substr(pos + 1);
    	final = fileName + ".jpg";
    	std::cout << final << std::endl;
    }

}