A simple function

[Zunft]

//In the Second function: I want "_ax" to change a1, a2, a3, a4...a11
//Is there a way to make 1 function instead of 11?
//Collisions\main.cpp|79|error: '_ax' has not been declared|

class obj {
public:
struct axis
{
bool collide; //0 - Ignore Collisions; 1 - Normal Collision;
double position; //Base of Collisions Calculations
double velocity; //Transotion in 1 tick
double width; //Space taken on axis
double high; //Highest Point on axis
double low; //Lowest Point on axis
};
axis a1;
axis a2;
axis a3;
axis a4;
char* name;
void update();
void setCollide(bool, bool, bool, bool);
void setPos(double, double, double, double);
void setVel(double, double, double, double);
void setWidth(double, double, double, double);
};

...

bool Collideax (bool debug, _ax, objA, objB) { // I want "_ax" to change a1, a2, a3, a4...a11
if (objA._ax.collide == false || objB._ax.collide == false ) {
if (debug == true) {
outputfile
<< _ax
<< " Collide"
<< (objA._ax.collide == false)
<< (objB._ax.collide == false)
<< endl;}
return true;
} else {
if (objA._ax.low <= objB._ax.high && objA._ax.low >= objB._ax.low || objA._ax.high <= objB._ax.high && objA._ax.high >= objB._ax.low) //Test a1
{
if (debug == true) {
cout << "Collision Detected " << _ax << " - " << objA.name << " and " << obj2.name << endl<<
"Time - " << ticks << endl <<
"Position ObjA " << _ax << " Position - " << (objA._ax.position) << endl <<
"Position ObjB " << _ax << " Position - " << (objB._ax1.position) << endl;
outputfile << "Collision Detected " << _ax << " - " << objA.name << " and " << objB.name << endl <<
"Time - " << ticks << endl <<
"Position ObjA " << _ax << " Position - " << (objA._ax.position) << endl <<
"Position ObjB " << _ax << " Position - " << (objB._ax.position) << endl
<< ")" << endl;
}
return true;
} else {
return false;
}
}
}

int time () {
while (ticks < 100) {
//move objects
outputfile << "Tick " << ticks << " - ";
obj1.update();
obj2.update();

//test collidion
bool colla1 = Collideax(1, a1, obj1, obj2); //obj9285...
bool colla2 = Collideax(1, a2, obj1, obj2);
bool colla3 = Collideax(1, a3, obj1, obj2);
bool colla4 = Collideax(1, a4, obj1, obj2);
if (colla1 && colla2 && colla3 && colla4) {
cout<< "Collide" << endl;
outputfile << colla1 << colla2 << colla3 << colla4 << endl;
} else {
cout << colla1 << colla2 << colla3 << colla4 << endl;
outputfile << colla1 << colla2 << colla3 << colla4 << endl;
}
ticks++;
Sleep(1);
}
cout << endl << "Ticks - " << ticks << endl;
outputfile << endl << "Ticks - " << ticks << endl;
return (ticks);
}


int main(){
obj1.setPos(10,-10,0,.2);
obj1.setVel(-.2,.2,0,0);
obj1.setWidth(1,1,1,.4);
obj1.setCollide(true, true, false, false);
obj1.name = "Box One";
obj1.update();
obj2.setPos(-10,10,0,0);
obj2.setVel(.2,-.2,0,0);
obj2.setWidth(1,1,1,0);
obj2.setCollide(true, true, false, false);
obj2.name = "Box Two";
obj2.update();
time();
outputfile.close();
}

//In the Second function: I want "_ax" to change a1, a2, a3, a4...a11
//Is there a way to make 1 function instead of 11?
//Collisions\main.cpp|79|error: '_ax' has not been declared|

[Zhuge]

Why not make a1...11 an array and pass the subscript to the function?

[Zunft]

how do you "make a1...11 an array and pass the subscript to the function?"

[Zhuge]

Check you this tutorial on arrays:
http://cplusplus.com/doc/tutorial/arrays/
You seem to already know how to pass values to functions, but you can review that here as well:
http://cplusplus.com/doc/tutorial/functions/

[Zunft]

i was looking for something like:
int _ax
float _ax
double _ax
...

i don't see how an array will help with out it ether

[Zhuge]

An array will help because you'll need only one function to work on that array; you'd simply pass which element of that array you want the function to work on. In any case I'd suggest making large numbers of variables that simply have a different number appended to them an array anyway as it makes programmatical sense since they are all related.

If you're set on trying to use a sort of _ax thing, you could make those variables reference parameters to the function and pass in the particular a1...11 you want as an argument.

void func(int& _ax) {
    _ax += 1;
}

int main() {
    int a1, a2, a3; // ... assume defined
    func(a1); // func() will use _ax to refer to a1
    func(a2); //etc.
}

[JockX]

Zunft wrote:
i was looking for something like:
int _ax
float _ax
double _ax

For this, you'd want to use function templates: http://cplusplus.com/doc/tutorial/templates/

A simple template to add arguments of different types:

template <class A, class B>
A add (A a, B b)
{
	return a + b;
}

You can substitute types A and B with whatever you need to add.