(C++) std::iter\_swap

January 10, 2018 · View on GitHub

(C++) std::iter_swap

std::iter_swap is an STL function to swap the data two iterators point to.

#include <cassert> #include <vector> int main() { //Create a std::vector std::vector<int> v; v.push_back(1); v.push_back(2); //How are these ints stored? assert(v[0]==1); assert(v[1]==2); //Create two iterators std::vector<int>::iterator i = v.begin(); std::vector<int>::iterator j = v.end() - 1; //What are the iterators pointing to? assert(i == 1); assert(j == 2); //Swap the data the iterators are pointing to std::iter_swap(i,j); //What are the iterators pointing to now? assert(i == 2); assert(j == 1); //How are these ints stored now? assert(v[0]==2); assert(v[1]==1); }