Possible Duplicate:
What are the differences between pointer variable and reference variable in C++?
Are there benefits of passing by pointer over passing by reference in C++?Passare da puntatore e Pass con riferimento
In entrambi i casi, ho raggiunto il risultato. Quindi quando si preferisce l'altro? Quali sono i motivi per cui usiamo l'uno sull'altro?
#include <iostream>
using namespace std;
void swap(int* x, int* y)
{
int z = *x;
*x=*y;
*y=z;
}
void swap(int& x, int& y)
{
int z = x;
x=y;
y=z;
}
int main()
{
int a = 45;
int b = 35;
cout<<"Before Swap\n";
cout<<"a="<<a<<" b="<<b<<"\n";
swap(&a,&b);
cout<<"After Swap with pass by pointer\n";
cout<<"a="<<a<<" b="<<b<<"\n";
swap(a,b);
cout<<"After Swap with pass by reference\n";
cout<<"a="<<a<<" b="<<b<<"\n";
}
uscita
Before Swap
a=45 b=35
After Swap with pass by pointer
a=35 b=45
After Swap with pass by reference
a=45 b=35
http://stackoverflow.com/questions/114180/pointer-vs-reference –
[Ci sono vantaggi del passaggio del puntatore al passaggio per riferimento in C++?] (Http://stackoverflow.com/q/334856/ 187543) – cpx