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push_back a struct into a vector
struct point{
     int x;
     int y;
};

vector <point> a;

a.push_back( ??? );

point mypoint = {0, 1};
a.push_back(mypoint);

a.push_back(point(0,1));

point make_point(int x, int y) {
    point mypoint = {x, y};
    return mypoint;
}

a.push_back(make_point(0, 1));

point p;
p.x = 1;
p.y = 2;

a.push_back(p);

point foo; //initialize with whatever
a.push_back(foo);