How can I insert element into beginning of vector?

Question

I need to insert values into the beginning of a std::vector and I need other values in this vector to be pushed to further positions for example: something adde

Answer 1

Use the std::vector::insert function accepting an iterator to the first element as a target position (iterator before which to insert the element):

#include 

int main() {
    std::vector v{ 1, 2, 3, 4, 5 };
    v.insert(v.begin(), 6);
}

Alternatively, append the element and perform the rotation to the right:

#include 
#include 

int main() {
    std::vector v{ 1, 2, 3, 4, 5 };
    v.push_back(6);
    std::rotate(v.rbegin(), v.rbegin() + 1, v.rend());
}