vector iteration loop throwing an error?

Question

for (std::vector::iterator it = v.begin(); it != v.end(); ++it)

error: conversion from \'std::vector::const_iterator {aka

Answer 1

You are in a context where v is const. Use const_iterator instead.

for (std::vector<int>::const_iterator it = v.begin(); it != v.end(); ++it)

Note 1. auto would do this automatically for you:

for (auto it = v.begin(); it != v.end(); ++it)

Note 2. You could use a range based loop if you don't need access to the iterators themselves, but to the elements of the container:

for (auto elem : v) // elem is a copy. For reference, use auto& elem