list::insert

Article
04/22/2008

Inserts an element or a number of elements or a range of elements into a list 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 target list where the first element is inserted.
_Val
The value of the element being inserted into the list.
_Count
The number of elements being inserted into the list.
_First
The position of the first element in the range of elements in the argument list to be copied.
_Last
The position of the first element beyond the range of elements in the argument list to be copied.

Return Value

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

Remarks

Any insertion operation can be expensive.

Example

// list_class_insert.cpp
// compile with: /EHsc
#include <list>
#include <iostream>

int main( ) 
{
   using namespace std;
   list <int> c1, c2;
   list <int>::iterator Iter;
   
   c1.push_back( 10 );
   c1.push_back( 20 );
   c1.push_back( 30 );
   c2.push_back( 40 );
   c2.push_back( 50 );
   c2.push_back( 60 );

   cout << "c1 =";
   for ( Iter = c1.begin( ); Iter != c1.end( ); Iter++ )
      cout << " " << *Iter;
   cout << endl;

   Iter = c1.begin( );
   Iter++;
   c1.insert( Iter, 100 );
   cout << "c1 =";
   for ( Iter = c1.begin( ); Iter != c1.end( ); Iter++ )
      cout << " " << *Iter;
   cout << endl;

   Iter = c1.begin( );
   Iter++;
   Iter++;
   c1.insert( Iter, 2, 200 );

   cout << "c1 =";
   for ( Iter = c1.begin( ); Iter != c1.end( ); Iter++ )
      cout << " " << *Iter;
   cout << endl;

   c1.insert( ++c1.begin( ), c2.begin( ),--c2.end( ) );

   cout << "c1 =";
   for ( Iter = c1.begin( ); Iter != c1.end( ); Iter++ )
      cout << " " << *Iter;
   cout << endl;
}

Output

c1 = 10 20 30
c1 = 10 100 20 30
c1 = 10 100 200 200 20 30
c1 = 10 40 50 100 200 200 20 30

Requirements

Header: <list>

Namespace: std

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