heap.cpp

来自「the source of dev_c++ most of them for 」· C++ 代码 · 共 52 行

// Heap
// Demonstrates dynamically allocating memory

#include <iostream>

using namespace std;

int* intOnHeap();  //returns an int on the heap
void leak1();  //creates a memory leak
void leak2();  //creates another memory leak

int main()
{
    int* pHeap = new int;
    *pHeap = 10;
    cout << "*pHeap: " << *pHeap << "\n\n";
    
    int* pHeap2 = intOnHeap();
    cout << "*pHeap2: " << *pHeap2 << "\n\n";
    
    cout << "Freeing memory pointed to by pHeap.\n\n";
    delete pHeap;

    cout << "Freeing memory pointed to by pHeap2.\n\n";
    delete pHeap2;
    
    //get rid of dangling pointers
    pHeap = 0; 
    pHeap2 = 0;
   
    return 0;
}

int* intOnHeap()
{
    int* pTemp = new int(20);
    return pTemp;
}

void leak1()
{
    int* drip1 = new int(30);
}

void leak2()
{
    int* drip2 = new int(50);
    drip2 = new int(100);
    delete drip2;
}