set::swap, set::begin, e set::end
Viene illustrato come utilizzare impostare:: scambio,impostare:: inizio, andimpostare:: estremità Funzioni della libreria di modelli standard (STL) in Visual C++.
template<class _K, class _Pr, class _A>
class set
{
public:
// Function 1:
void swap(_Myt& _X);
// Function 2:
friend void swap(_Myt& _X, _Myt& _Y);
// Function 3:
const_iterator begin( ) const;
// Function 4:
const_iterator end( ) const;
}
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.
swap la funzione scambia le due sequenze archiviate.inizio la funzione restituisce un iteratore bidirezionale che punta al primo elemento della sequenza.estremità la funzione restituisce un iteratore bidirezionale che punta appena oltre la fine della sequenza.
Esempio
// SetSwapBeginEnd.cpp
// compile with: /EHsc
//
// Illustrates how to use the swap function to exchange the two
// controlled sequences. It also illustrates how to use the
// begin function to get a bidirectional iterator that points at
// the first element of the controlled sequence. Finally, it
// illustrates how to use the end function to get a bidirectional
// iterator that points just beyond the end of the controlled
// sequence.
//
// Functions:
//
// swap Exchanges the two controlled sequences.
// begin Returns a bidirectional iterator that points at the
// first element of the controlled sequence.
// end Returns a bidirectional iterator that points just
// beyond the end of the controlled sequence.
//
//////////////////////////////////////////////////////////////////////
#pragma warning(disable:4786)
#include <set>
#include <iostream>
using namespace std ;
typedef set<int> SET_INT;
int main() {
SET_INT s1;
SET_INT s2;
SET_INT::iterator i;
cout << "s1.insert(5)" << endl;
s1.insert(5);
cout << "s1.insert(10)" << endl;
s1.insert(10);
cout << "s1.insert(15)" << endl;
s1.insert(15);
cout << "s2.insert(2)" << endl;
s2.insert(2);
cout << "s2.insert(4)" << endl;
s2.insert(4);
cout << "swap(s1,s2)" << endl;
swap(s1,s2);
// Displays: 2,4
for (i=s1.begin();i!=s1.end();i++)
cout << "s1 has " << *i << " in its set." << endl;
// Displays: 5,10,15
for (i=s2.begin();i!=s2.end();i++)
cout << "s2 has " << *i << " in its set." << endl;
cout << "s1.swap(s2)" << endl;
s1.swap(s2);
// Displays: 5,10,15
for (i=s1.begin();i!=s1.end();i++)
cout << "s1 has " << *i << " in its set." << endl;
// Displays: 2,4
for (i=s2.begin();i!=s2.end();i++)
cout << "s2 has " << *i << " in its set." << endl;
}
Output
s1.insert(5)
s1.insert(10)
s1.insert(15)
s2.insert(2)
s2.insert(4)
swap(s1,s2)
s1 has 2 in its set.
s1 has 4 in its set.
s2 has 5 in its set.
s2 has 10 in its set.
s2 has 15 in its set.
s1.swap(s2)
s1 has 5 in its set.
s1 has 10 in its set.
s1 has 15 in its set.
s2 has 2 in its set.
s2 has 4 in its set.
Requisiti
intestazione: <set>