[C++] Constructors / Destructors

I'm a beginner programmer, and I was wondering...
I need a unique ID for my object in the game
so I thought I define a global class that holds the global id, and when I call the constructor of an object it will be incremented, while calling the destructor of that object it decrements it.
Is it true that for every constructor call there will be a corresponding destructor?
second... is it possible to compare the memory adresses (this should be a unique id enough) of the objects instead of using an id_holder?
class id_holder{
private:
    int id_count;

public:
    id_holder() {id_count = 0 ; std::cout<< "unique_id: I'm constructed"<<std::endl;}

    ~id_holder(){std::cout<<"unique_id: I'm destructed"<<std::endl;}

    void increment_id(){id_count ++;};
    void decrement_id(){id_count --;};

    int get_id() {return id_count;};

};

class BaseObject {
protected:
    void increment_id();
    void decrement_id();
public:
    virtual ~BaseObject(){decrement_id();}
    BaseObject();
    BaseObject(V2 pos, ObjectType idobj, double s, Color col);
};

BaseObject::BaseObject(){  
    //stuff
    increment_id();
    unique_id = bObj_id_counter.get_id();
}


BaseObject::BaseObject(V2 pos, ObjectType idobj, double s, Color col){
    //stuff
    increment_id();
    unique_id = bObj_id_counter.get_id();
}

void BaseObject::increment_id(){
    bObj_id_counter.increment_id();
}

void BaseObject::decrement_id(){
    bObj_id_counter.decrement_id();
}

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I hope you are trolling. Just make a static member variable that holds the global id.

[code]
class BaseObject
{
private:
    static unsigned int global_id = 0;
    unsigned int object_id;

public:
    BaseObject() {
        object_id = global_id++;
    }
};

>>1

Also, just in case you weren't a troll, all you want is a global id right? Static member variable is of course the correct way.

Your id_holder class is silly. It behaves just like normal integer, but it looks more complicated (instead of id++, you must type fuctard_object.increment()). Don't make unnecessary classes. That's a code smell.
http://en.wikipedia.org/wiki/Code_smell

Is it true that for every constructor call there will be a corresponding destructor?
If the object is allocated dynamically, you need to delete it or use a smart pointer and let it clean up for you. Otherwise, the destructor won't be called.

Is it possible to compare the memory addresses?
Yes, it's possible, but bear in mind that when you copy an object, it will have a different address. Depending on what you're trying to achieve, your best option may be to generate a hash based on the data of the object and compare that.

C++ is unscientific and ultimately constructive / destructive.