deque::insert

Article
07/29/2015

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

iterator insert(
    const_iterator Where,
    const Type& Val
);
iterator insert(
    const_iterator Where,
    Type&& Val
);
void insert(
    iterator Where,
    size_type Count,
    const Type& Val
);
template<class InputIterator>
    void insert(
        iterator Where,
        InputIteratorFirst,
        InputIteratorLast
    );
iterator insert(
    iterator Where,
initializer_list<Type> IList
);

Parameters

Parameter	Description
Where	The position in the target deque where the first element is inserted.
Val	The value of the element being inserted into the deque.
Count	The number of elements being inserted into the deque.
First	The position of the first element in the range of elements in the argument deque to be copied.
Last	The position of the first element beyond the range of elements in the argument deque to be copied.
IList	The initializer_list of elements to insert.

Return Value

The first two insert functions return an iterator that points to the position where the new element was inserted into the deque.

Remarks

Any insertion operation can be expensive.

Code

// deque_insert.cpp
// compile with: /EHsc
#include <deque>
#include <iostream>
#include <string>

int main()
{
    using namespace std;
    deque <int> c1, c2;
    deque <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 (auto c1_iter : c1)
        cout << c1_iter << " ";
    cout << "]" << endl;

    Iter = c1.begin();
    Iter++;
    c1.insert(Iter, 100);
    cout << "[ c1 = ";
    for (auto c1_iter : c1)
        cout << c1_iter << " ";
    cout << "]" << endl;

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

    cout << "[ c1 = ";
    for (auto c1_iter : c1)
        cout << c1_iter << " ";
    cout << "]" << endl;

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

    cout << "[ c1 = ";
    for (auto c1_iter : c1)
        cout << c1_iter << " ";
    cout << "]" << endl;

    // initialize a deque of strings by moving
    deque < string > c3;
    string str("a");

    c3.insert(c3.begin(), move(str));
    cout << "Moved first element: " << c3.front() << endl;

    c1.insert(c1.end(), { 70, 80, 90 });
    for (auto c1_iter : c1)
        cout << c1_iter << " ";
    cout << endl;
}// deque_insert.cpp
// compile with: /EHsc
#include <deque>
#include <iostream>
#include <string>

int main( ) 
{
    using namespace std;
    deque <int> c1, c2;
    deque <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;

// initialize a deque of strings by moving
    deque < string > c3;
    string str("a");

    c3.insert( c3.begin(), move( str ) );
    cout << "Moved first element: " << c3.front( ) << 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 ]
Moved first element: a
10 40 50 100 200 200 20 30 70 80 90

Requirements

Header: <deque>

Namespace: std