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vector::insert 

Inserts an element or a number of elements or a range of elements into the vector at a specified position.


iterator insert(
   iterator _Where,
   const Type& _Val
);
void insert(
   iterator _Where,
   size_type _Count,
   const Type& _Val
);
template<class InputIterator>
      void insert(
      iterator _Where,
      InputIterator _First,
      InputIterator _Last
   );

Parameters

_Where

The position in the vector where the first element is inserted.

_Val

The value of the element being inserted into the vector.

_Count

The number of elements being inserted into the vector.

_First

The position of the first element in the range of elements to be copied.

_Last

The position of the first element beyond the range of elements to be copied.

The first insert function returns an iterator that points to the position where the new element was inserted into the vector.

Any insertion operation can be expensive, see vector Class for a discussion of vector performance.

// vector_insert.cpp
// compile with: /EHsc
#include <vector>
#include <iostream>

int main( )
{
   using namespace std;   
   vector <int> v1;
   vector <int>::iterator Iter;
   
   v1.push_back( 10 );
   v1.push_back( 20 );
   v1.push_back( 30 );

   cout << "v1 =" ;
   for ( Iter = v1.begin( ) ; Iter != v1.end( ) ; Iter++ )
      cout << " " << *Iter;
   cout << endl;

   v1.insert( v1.begin( ) + 1, 40 );
   cout << "v1 =";
   for ( Iter = v1.begin( ) ; Iter != v1.end( ) ; Iter++ )
      cout << " " << *Iter;
   cout << endl;
   v1.insert( v1.begin( ) + 2, 4, 50 );

   cout << "v1 =";
   for ( Iter = v1.begin( ) ; Iter != v1.end( ) ; Iter++ )
      cout << " " << *Iter;
   cout << endl;

   v1.insert( v1.begin( )+1, v1.begin( )+2, v1.begin( )+4 );
   cout << "v1 =";
   for (Iter = v1.begin( ); Iter != v1.end( ); Iter++ )
      cout << " " << *Iter;
   cout << endl;
}

Output

v1 = 10 20 30
v1 = 10 40 20 30
v1 = 10 40 50 50 50 50 20 30
v1 = 10 50 50 40 50 50 50 50 20 30

Header: <vector>

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