// C++03
class Foo {
    std::vector<MyThing*> thingContainer_;
public:
    ~Foo() { // have to manually delete everything
        std::vector<MyThing*>::iterator it = thingContainer_.begin();
        while(it != thingContainer.end()) {
            delete *it;
            it = thingContainer_.erase(it);
        }
    }

    MyThing* add_thing() {
        thingContainer_.push_back(new MyThing);
        return thingContainer_.back();
    }

    void remove_thing(MyThing* thing) {
        std::vector<MyThing*>::iterator it = thingContainer_.begin();
        for(; it != thingContainer_.end(); ++it) {
            if(*it == thing) {
                delete *it;  // manually delete...
                thingContainer_.erase(it);
                return;
            }
        }
    }
};


// C++11
class Foo {
    std::vector<std::shared_ptr<MyThing> > thingContainer_;
public:
    ~Foo() {} // Don't need destructor any more! std::shared_ptr deletes all things automatically

    std::shared_ptr<MyThing> add_thing() {
        thingContainer_.push_back(new MyThing);
        return thingContainer_.back();
    }

    void remove_thing(MyThing* thing) {
        for(auto it = thingContainer_.begin(); it != thingContainer_.end(); ++it) {
            if(*it == thing) {
                thingContainer_.erase(it);  // automatically also deletes the thing
                return;
            }
        }
    }
};