在递归函数中打印一次变量，该变量在每次递归时都会不断变化

Question

I have a void function in c++. It is recursive. During each recursion I pass on a vector that gets updated in the function. I want to print the vector only when it gets out of the function completely. But If I simply print the vector at the end of function, then it will be printed each time it gets out of recursion. Is there any condition I can apply so that I can make sure printing happens only once (At the end of the first function call)?

I really don't want to change the function return type from ' void ' to anything. Is there a way or is it impossible?

EDIT: Code looks something like below

void myClass::shortestPath(string* ar, int dim[2], vector<vector < int > > & path, vector<int > & minPath) {
    if (condition) {
        #some code to update path and minPath
        shortestPath(ar,dim,path, minPath);
    }
    #I cannot print minPath here because it will print each time it returns
    return;

}

Answer 1

The easies way would be creating second function:

void mainFunction(vector<...> &v) {
    prepareVector(v);
    printVector(v);
}

void prepareVector(vector<...> &v) {
    //your recursive code here
}

Second option is adding some parameter for determining if this is first call or not:

void recursiveFunction(vector<...> &v, bool first=true) {
    ...
    recursiveFunction(v, false);
    ...
    if(first) {
        printVector(v);
    }
}

In your code, if you just want to print it once, at the end, you can change your code to:

void myClass::shortestPath(string* ar, int dim[2], vector<vector < int > > & path, vector<int > & minPath) {
    if (condition) {
        #some code to update path and minPath
        shortestPath(ar,dim,path, minPath);
        return;
    }
    // now you can print it here we terminate calls before this line
    // if condition is true
    return;
}

I'm assuming, that following condition is satisfied: You are making recursive call if and only if condition is true.

But this function could me replaced with loop :

while(condition) {
    #some code to update path and minPath
}