Using Output Parameters
suggest changeParameters can be used for returning one or more values; those parameters are required to be non-const
pointers or references.
References:
void calculate(int a, int b, int& c, int& d, int& e, int& f) {
c = a + b;
d = a - b;
e = a * b;
f = a / b;
}
Pointers:
void calculate(int a, int b, int* c, int* d, int* e, int* f) {
*c = a + b;
*d = a - b;
*e = a * b;
*f = a / b;
}
Some libraries or frameworks use an empty ‘OUT’ #define
to make it abundantly obvious which parameters are output parameters in the function signature. This has no functional impact, and will be compiled out, but makes the function signature a bit clearer;
#define OUT
void calculate(int a, int b, OUT int& c) {
c = a + b;
}
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