Problems with classes
Author
What I want to do in my code is this:
Enemy *enemy = new BorgShip;
printf("hitchance = %f",enemy->hit_chance);
enemy = new KlingonShip;
printf("hitchance = %f",enemy->hit_chance);
So I have a pointer of type Enemy* but it can point do multiple classes like BorgShip and KlingonShip.
Is this possible?
So far I have this:
struct Enemy {
virtual static const float hit_chance =0;
GLuint battletex;
};
struct BorgShip: Enemy{
static const float hit_chance = 0.1;
static GLuint battletex;
BorgShip(){
battletex = borgshiptex;
}
};
struct KlingonShip: Enemy{
static const float hit_chance = 0.1;
static GLuint battletex;
KlingonShip(){
battletex = klingonshiptex;
}
};
No - only methods can be virtual, not static or non-static members.
Note that this is illustrates the point but is a poor use of inheritance. If the HitChance is the only thing that varies, a simple member would suffice without inheritance. Alternatively, providing a Hit() method and doing the calculation in there would be a better approach.
HTH Paul
class Ship{public: virtual ~Ship(){ } virtual float HitChance() const=0;};class BorgShip : public Ship{public: virtual float HitChance() const { return 0.5f; }};class KlingonShip : public Ship{public: virtual float HitChance() const { return 0.8f; }};void f(){ Ship *E=new BorgShip(); std::cout << E->HitChance() << std::endl; delete E; // you had a memory leak in your code :) E=new KlingonShip(); std::cout << E->HitChance() << std::endl; delete E;}Note that this is illustrates the point but is a poor use of inheritance. If the HitChance is the only thing that varies, a simple member would suffice without inheritance. Alternatively, providing a Hit() method and doing the calculation in there would be a better approach.
HTH Paul
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