Effective C++读书笔记——item13（使用对象管理资源）

1. 资源管理问题背景

class Investment { ... };            // root class of hierarchy of
                                     // investment types
Investment* createInvestment();      // return ptr to dynamically allocated
                                     // object in the Investment hierarchy;
                                     // the caller must delete it
                                     // (parameters omitted for simplicity)
void f()
{
  Investment *pInv = createInvestment();         // call factory function
  ...                                            // use pInv
  delete pInv;                                   // release object
}

• 在使用如createInvestment这类返回动态分配对象指针的函数时，若仅依靠手动在合适位置（如函数末尾）调用delete来释放资源，存