insert vector

Insert into vector C++

// inserting into a vector
#include <iostream>
#include <vector>

int main ()
{
  std::vector<int> myvector (3,100);
  std::vector<int>::iterator it;

  it = myvector.begin();
  it = myvector.insert ( it , 200 );

  myvector.insert (it,2,300);

  // "it" no longer valid, get a new one:
  it = myvector.begin();

  std::vector<int> anothervector (2,400);
  myvector.insert (it+2,anothervector.begin(),anothervector.end());

  int myarray [] = { 501,502,503 };
  myvector.insert (myvector.begin(), myarray, myarray+3);

  std::cout << "myvector contains:";
  for (it=myvector.begin(); it<myvector.end(); it++)
    std::cout << ' ' << *it;
  std::cout << '\n';

  return 0;
}

Posted by: Guest on April-03-2020

Source

#include <iostream> #include <vector> void print_vec(const std::vector<int>& vec) { for (auto x: vec) { std::cout << ' ' << x; } std::cout << '\n'; } int main () { std::vector<int> vec(3,100); print_vec(vec); auto it = vec.begin(); it = vec.insert(it, 200); print_vec(vec); vec.insert(it,2,300); print_vec(vec); // "it" no longer valid, get a new one: it = vec.begin(); std::vector<int> vec2(2,400); vec.insert(it+2, vec2.begin(), vec2.end()); print_vec(vec); int arr[] = { 501,502,503 }; vec.insert(vec.begin(), arr, arr+3); print_vec(vec); }

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