can you please explain these lines of code?

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
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can you please explain these lines of code?

namespace space_invaders
class Alien : public AnimatedEntity
{
public:
/** The initial step size of the aliens. */
static const int INITIAL_STEP_SIZE - 55;
/** The amount of steps to speed up the alien movement on each destruct. */
static const int STEP_DECREMENT_SIZE = 1;
/** The amount of aliens per row. */
static const int ALIENS_PER_ROW = 11;
// =========
======
forbidden default functions =
// =
// ======:
=========
Alien() = delete;
Alien(const Alien&) = delete;
Alien(Alien&&) = delete;
Alien& operator=(const Alien&)
Alien& operator=(Alien&&) =
delete;
delete;
// === =======:
// = allowed functions =
// ==========---========
Alien(Game& game, int index);
~Alien() override = default;
void disappear ();
int getPoints() const { return mPoints; }
private:
int resolveYPosition();
private:
int mIndex;
int mPoints;
};
typedef std::shared_ptr<Alien> AlienPtr;
Transcribed Image Text:namespace space_invaders class Alien : public AnimatedEntity { public: /** The initial step size of the aliens. */ static const int INITIAL_STEP_SIZE - 55; /** The amount of steps to speed up the alien movement on each destruct. */ static const int STEP_DECREMENT_SIZE = 1; /** The amount of aliens per row. */ static const int ALIENS_PER_ROW = 11; // ========= ====== forbidden default functions = // = // ======: ========= Alien() = delete; Alien(const Alien&) = delete; Alien(Alien&&) = delete; Alien& operator=(const Alien&) Alien& operator=(Alien&&) = delete; delete; // === =======: // = allowed functions = // ==========---======== Alien(Game& game, int index); ~Alien() override = default; void disappear (); int getPoints() const { return mPoints; } private: int resolveYPosition(); private: int mIndex; int mPoints; }; typedef std::shared_ptr<Alien> AlienPtr;
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