vector::push_back e vector::pop_back
Viene illustrato come utilizzare vettore:: push_back e vettore:: pop_back Funzioni della libreria di modelli standard (STL) in Visual C++.
template<class _TYPE, class _A>
void vector::push_back(
const _TYPE& X
);
template<class _TYPE, class _A>
void vector::pop_back();
Note
[!NOTA]
La classe/nomi di parametro nel prototipo non corrisponde alla versione nel file di intestazione.alcuni sono stati modificati per migliorare la leggibilità.
Nell'esempio viene dichiarato un vettore vuoto di Integer.Aggiunge tre numeri interi al vettore e quindi eliminato uno.Infine, genera gli elementi rimanenti nel vettore.
Esempio
// 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 ;
}
Requisiti
intestazione: <vettore>