const_cast.cpp

来自「Advanced Internet Programming Lecture 2 」· C++ 代码 · 共 25 行

#include <iostream>
using namespace std;

void sqrval(const int *val)
{
  int *p;

  // cast away const-ness.
  p = const_cast<int *> (val);

  *p = *val * *val; // now, modify object through v
}

int main()
{
  int x = 10;

  cout << "x before call: " << x << endl;
  sqrval(&x);
  cout << "x after call: " << x << endl;

  return 0;
}