c ++错误：'＆'标记之前的预期primary-expression

Question

I'm learning c++ and I have the following code which gives an error in line 39 (fill_file() call). I've searched on the web for a solution but can't find why I get this error (expected primary-expression before '&' token).

#include <iostream>
#include <string>
#include <vector>
#include "../std_lib_facilities.h"
using namespace std;

struct Point {
    double x;
    double y;
};

void fill_file(vector<Point>& original_points) {
    string outputfile="mydata.txt";
    ofstream ost{outputfile};
    if(!ost) error("Can't open outputfile ", outputfile);
    for(int i=0;i<original_points.size();i++) {
        ost << original_points[i].x << " " << original_points[i].y << endl;
    }
}

int main() {
    cout << "Please enter 3 points with a value: " << endl;
    vector<Point> original_points;
    Point p;
    double x;
    double y;
    for(int i=0;i<3;i++) {
        cin>>p.x;
        cin>>p.y;
        original_points.push_back(p);
    }
    cout << endl;
    cout << endl << "Points: " << endl;
    for(int i=0;i<original_points.size();i++) {
        cout << original_points[i].x << " " << original_points[i].y << endl;
        /* ost << original_points[i].x << " " << original_points[i].y << endl; */
    }
    cout << endl << endl;
    fill_file(vector<Point>& original_points);
    return 0;
}

What am I doing wrong? Thx for the help!!

Answer 1

You made a mistake when you called your fill_file function:

fill_file(vector<Point>& original_points);

must be called like this:

fill_file(original_points);

Answer 2

You made an error calling the function fill_file() . Currently you call it like this:

fill_file(vector<Point>& original_points);

This above, I presume is a copy paste error. What I thing you want to do is:

fill_file(original_points);

because original_points is the actual variable, not vector<Point>& original_points . As your error states:

expected primary-expression before '&' token

As seen above, you are putting a random l-value in the function call, and this is not allowed.