Question

I need to identify what properties(strings) are processed by a method. So, I have designed my method as below.

void method1( std::vector<String> * myVector )
{
   myVector = new std::vector<String>();  
   //do something;
   myVector->push_things;
}

So, I would call method1 from topMethod() like this.

topMethod()
{
   std::vector<String> * aVector = 0;
   method1( aVector );
   //process aVector to identify its contents;
}

Now, the vector myVector in method1() is getting populated fine. But its contents are unable at the caller method i.e., topMethod(). I’m not sure how they are getting freed. I feel that I’m allocating using new, so they should ideally be present at the caller location after the call..

Please provide your thoughts on what is going wrong.

Answer 1

You should pass the pointer to vector by reference.
You are allocating to a copy of the pointer to vector you passed not the pointer you passed.

void method1( std::vector<int>* & myVector )

This should fix it.