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javac++clone

Struct value storage

I am converting a program originally in C++ over to Java, since I have little experience with C++, and am having some problems.

struct indx{ int i,j; };
void increment(indx place) { 

    place.i+=5;
    place.j+=5;

}

When C++ passes structures through methods and modifications are made, are they maintained in the rest of the code? In Java terms, will modifying a struct in a method be the same as modifying a clone?

Solution

  • You're passing place by value which means increment is operating on a copy of your structure, not the original. Change to pass-by-reference, like this:

    void increment(indx& place) {
...
}

    The function will then be operating on the original structure and any modifications will persist back to the caller.