No default constructor exists for class error

Vote count:

0

Some simple code:

class Thing {
public:
    int num;
    Thing(int num) { 
        this->num = num; 
    }
};

class Stuff {
public:
    Thing thing;  // an instance of thing is declared here but it cannot construct it
    Stuff(Thing thing) {
        this->thing = thing;
    }
};

int main() {
    Thing thing = Thing(5);
    Stuff stuff = Stuff(thing);
}

So here, I'm trying to work out how I should be taking a new instance of Thing in the constructor of Stuff without pointing to it as I want Stuff to hold its own copy. Of course, I can't declare thing like I have above because it's trying to initialise it.

How can I get around this problem of assigning a new object copy to a class' variable through its constructor?

Exact error is:

In constructor 'Stuff::Stuff(Thing)':
error: no matching function for call to 'Thing::Thing()'
  Stuff(Thing thing){ this->thing = thing; }

candidate expects 1 argument, 0 provided

asked 1 min ago

Jazcash

330

No default constructor exists for class error