问从刚刚由std::ofstream创建和编写的文件中读取文件时是否存在任何问题？

EN

//the writer
#include<iostream>
#include<fstream>
#include<chrono>
#include<thread>
using namespace std;
int main(int argc,char* argv[]){
    
    {
        std::ofstream file_writer{"test.txt"};

        file_writer << "when the file is actually written out?" << std::endl;
    }


    std::this_thread::sleep_for(std::chrono::seconds(3600));  //the reader below would be called and this process is still alive.  
    return 0;
}

//the reader
#include<iostream>
#include<fstream>
using namespace std;
int main(int argc,char* argv[]){
    
    {
        std::ifstream file_reader{"test.txt"};

        file_reader.read();
    }
    
    return 0;
}