几个小例子--memory leak

void MemoryLeak( )
{
int *data = new int;
*data = 15;
}

void MemoryLeak() {
int* ptr = new int;
// do something which may throw an exception
// we never get here if an exception is thrown
delete ptr;
}

int * a = malloc(sizeof(int));
a = 0; //this will cause a memory leak

char *s = (char*) malloc(5);
delete s;   //不能使用delete去释放malloc分配的内存

char* pStr = (char*) malloc(20);
free(pStr);
free(pStr); // results in an invalid deallocation

MyClass* MemoryLeak()
{
MyClass temp;
return &temp;
}

...
delete ptr;
ptr = nullptr;

ptr->show();

char* function( char* c)
{
char* temp = new char [ strlen (c) + 1 ];
strcpy ( temp, c );
delete[] c; //错误，不应该删除形参的指针
return temp;//错误，返回局域变量的指针
}

MyWindow* window;
window->show();

MyWindow window;
delete window;