Slicing a vector

Question

I have a std::vector. I want to create iterators representing a slice of that vector. How do I do it? In pseudo C++:

class InterestingType;

void doSomethi         


        

Answer 1

I learnt Python before I learnt C++. I wondered if C++ offered slicing of vectors like slicing in Python lists. Took a couple of minutes to write this function that allows you to slice a vector analogous to the way its done in Python.

vector slice(const vector& v, int start=0, int end=-1) {
    int oldlen = v.size();
    int newlen;

    if (end == -1 or end >= oldlen){
        newlen = oldlen-start;
    } else {
        newlen = end-start;
    }

    vector nv(newlen);

    for (int i=0; i

Usage:

vector newvector = slice(vector_variable, start_index, end_index);

The start_index element will be included in the slice, whereas the end_index will not be included.

Example:

For a vector v1 like {1,3,5,7,9}

slice(v1,2,4) returns {5,7}