auto_ptr.cpp

来自「Thinking in c++ 2nd edition,c++编程思想（第2版）」· C++ 代码 · 共 34 行

//: C01:Auto_ptr.cpp
// From "Thinking in C++, Volume 2", by Bruce Eckel & Chuck Allison.
// (c) 1995-2004 MindView, Inc. All Rights Reserved.
// See source code use permissions stated in the file 'License.txt',
// distributed with the code package available at www.MindView.net.
// Illustrates the RAII nature of auto_ptr.
#include <memory>
#include <iostream>
#include <cstddef>
using namespace std;

class TraceHeap {
  int i;
public:
  static void* operator new(size_t siz) {
    void* p = ::operator new(siz);
    cout << "Allocating TraceHeap object on the heap "
         << "at address " << p << endl;
    return p;
  }
  static void operator delete(void* p) {
    cout << "Deleting TraceHeap object at address "
         << p << endl;
    ::operator delete(p);
  }
  TraceHeap(int i) : i(i) {}
  int getVal() const { return i; }
};

int main() {
  auto_ptr<TraceHeap> pMyObject(new TraceHeap(5));
  cout << pMyObject->getVal() << endl;  // Prints 5
} ///:~