vector::push_back und vector::pop_back

Artikel
03/15/2013

Veranschaulicht, wie die Features Vektor::push_back und Vektor::pop_back Standardvorlagenbibliothek (STL) in Visual C++ verwendet.

template<class _TYPE, class _A>
   void vector::push_back( 
      const _TYPE& X 
   );
template<class _TYPE, class _A>
   void vector::pop_back();

Hinweise

Hinweis
Die Klasse/Parameternamen im Prototyp stimmen nicht mit der Version in der Headerdatei ab.Einige wurden geändert, um die Lesbarkeit zu verbessern.

Das Beispiel deklariert einen leeren Vektor von ganzen Zahlen.Sie fügt drei ganzen Zahlen dem Vektor hinzu, und löscht dann ein.Schließlich generiert es die übrigen Elemente im Vektor.

Beispiel

// Pushpop.cpp
// compile with: /EHsc
// Illustrates how to use the push and pop member
// functions of the vector container.
//
// Functions:
//
// vector::push_back - Appends (inserts) an element to the end of a
// vector, allocating memory for it if necessary.
//
// vector::pop_back -  Erases the last element of the vector.
//
// vector::begin - Returns an iterator to start traversal of the vector.
//
// vector::end - Returns an iterator for the last element of the vector.
//
// vector::iterator - Traverses the vector.
//
//////////////////////////////////////////////////////////////////////

// The debugger can't handle symbols more than 255 characters long.
// STL often creates symbols longer than that.
// When symbols are longer than 255 characters, the warning is disabled.
#pragma warning(disable:4786)

#include <iostream>
#include <vector>

using namespace std ;

typedef vector<int> INTVECTOR;

int main()
{
    // Dynamically allocated vector begins with 0 elements.
    INTVECTOR theVector;

    // Iterator is used to loop through the vector.
    INTVECTOR::iterator theIterator;

    // Add one element to the end of the vector, an int with the value 42.
    // Allocate memory if necessary.
    theVector.push_back(42) ;

    // Add two more elements to the end of the vector.
    // theVector will contain [ 42, 1, 109 ].
    theVector.push_back(1) ;
    theVector.push_back(109) ;

    // Erase last element in vector.
    theVector.pop_back();

    // Print contents of theVector. Shows [ 42, 1 ]
    cout << "theVector [ " ;
    for (theIterator = theVector.begin(); theIterator != theVector.end();
         theIterator++)
    {
        cout << *theIterator;
        if (theIterator != theVector.end()-1) cout << ", ";
                                             
    }
    cout << " ]" << endl ;
}

Anforderungen

Header: <vector>

Siehe auch

Referenz

abs (<valarray>)

Konzepte

Standardvorlagenbibliotheks-Beispiele

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