PSIgroup | CodingCpp / Object Encapsulation

Trail Index | Objects 2 | Object Encapsulation

With the complete object, we can easily change things, taking advantage of the fact that its internal workings are now completely hidden from the outside world - a property know as encapsulation:

/*
* Ojects: hide internal change
*
* Assuming reasonably that the operator() is called more
* often than getK and setK,
* you may speed-up the calculation by
* avoid calculating sqrt(k1) each time.
* With the object, this change can be completely hidden from
* the rest of of the code, which will not need any modification
*/

class Function {
public:
double operator()(double x) const {
return sqK1*x+k2*x*x;
}
void setK1(double v) {
if (v>0)
sqK1=sqrt(v);
}
void setK2(double v) {
k2=v;
}
private:
double sqK1=0.;
double k2=0.;
}

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