CODEWITHSUNDEEP
c++
Xiaocheng
Xiaocheng

Reputation: 23

open a file in a function and use it in main

I have a school project. The project requires me to write a function called openFiles. So I need to open a file inside the function and use it in main or other functions. How can I do that? Assumed my file is named "1"

#include<iostream>
#include<string>
#include<fstream>
using namespace std;
void openFiles(string);
main() {
    openFiles("1");
    string str;
    while(file>>str)cout<<str;
}
void openFiles(string str){
    fstream file;
    file.open(str);
    
}

Upvotes: 2

Views: 128

Answers (1)

catnip
catnip

Reputation: 25408

Because fstream has a move constructor, you can return your fstream object as the result of openFiles, like so:

#include <iostream>
#include <string>
#include <fstream>

using namespace std;

fstream openFiles(string);

int main() {
    auto file = openFiles("1");
    string str;
    while(file>>str)cout<<str;
}

fstream openFiles(string str){
    fstream file;
    file.open(str);
    return file;
}

Of course, you should check if the open succeeds.

Upvotes: 4

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