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Asked: 2026-06-02T04:56:20+00:00

Making a vector of lists of unsigneds in C++. I am clueless when it

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Making a vector of lists of unsigneds in C++. I am clueless when it comes to pointers but I think I need to declare the vector as holding pointers to the lists.

It’s just been a disaster. If it compiles at all, I get seg faults.

I don’t know in advance how large the vector will be until I get a file to read (it should be on the first line) and I won’t know how large the lists will be until i get through the file.

Any ideas on how to declare the vector of lists? I think once I get that I can figure out the rest (OK maybe not but I’ll be closer). Thx.

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  1. Editorial Team

    • Use a debugger to trace the location of the crash.

    • Never make a vector of raw pointers; use smart pointers only if you absolutely must have a vector of pointers.

    • Vectors do the memory management and resizing for you.

      vector<list<TYPE> > vecOfLists; //empty
      vecOfLists.push_back (some_list); //add new list onto the back

    If you’re using lists in place of an ordinary array, you might be better off using a vector of vectors instead.

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