Slicing a vector in C++

Question

Is there an equivalent of list slicing [1:] from Python in C++ with vectors? I simply want to get all but the first element from a vector.

Python\'s lis

Answer 1

It seems that the cheapest way is to use pointer to the starting element and the number of elements in the slice. It would not be a real vector but it will be good enough for many uses.

Answer 2

This can easily be done using std::vector's copy constructor:

v2 = std::vector<int>(v1.begin() + 1, v1.end());

Answer 3

You can follow the above answer. It's always better to know multiple ways.

int main
{
    std::vector<int> v1 = {1, 2, 3};
    std::vector<int> v2{v1};
    v2.erase( v2.begin() );
    return 0;
}

Answer 4

I know it's late but have a look at valarray and its slices. If you are using a vector of some sort of NumericType, then it's worth giving it a try.