Now that we have a reference counting class, we will introduce this to our smart pointer class. We will maintain a pointer to classRCin ourSPclass and this pointer will be shared for all instances of the smart pointer which refers to the same pointer. For this to happen, we need to ha...
Now that we have a reference counting class, we will introduce this to our smart pointer class. We will maintain a pointer to classRCin ourSPclass and this pointer will be shared for all instances of the smart pointer which refers to the same pointer. For this to happen, we need to ha...
In this code we don’t need to free the memory after using the dynamically allocated variable. This shows the basic idea behind the implementation. You can easily make it generic by using template library. Another idea is based on reference counting that is used in shared pointer, it is bei...
Of course, this is not limited to a single CSample instance, or two pointers, or a single function. Here are some use cases for a shared_ptr. use in containers using the pointer-to-implementation idiom (PIMPL) Resource-Acquisition-Is-Initialization (RAII) idiom Separating Interface from...
CTestClass() { printf(“Create”); } voidDoPrint() {} ~CTestClass() { printf(“destroy”); } } // 以下代码创建栈对象 CTestClass test; test.DoPrint(); 栈对象生命周期由后台管理。当方法结束时,栈对象会从栈中弹出,编译器会自动销毁栈所弹出的对象。
implementation { TSmartPointer<T> } constructor TSmartPointer<T>.Create; begin inherited; FValue := T.Create; end; // complains: overload procedure TSmartPointer.Create must be marked with the overload directive constructor TSmartPointer<T>.Create(AValue: T); ...
The simplest example of a smart pointer is auto_ptr, which is included in the standard C++ library. You can find it in the header <memory>, or take a look atScott Meyers' auto_ptr implementation. Here is part of auto_ptr's implementation, to illustrate what it does: ...
"unicode/localpointer.h" #include "unicode/rep.h" #include "unicode/unistr" #include "unicode/chariter.h" @@ -179,6 +180,24 @@ typedefstruct UText UText; /**< C typedef for struct UText. @stableICU 3.6 */ U_STABLE U * U_EXPORT2 utext(UText *ut); #ifdef XP_...
smart pointer templates before, I decided to look at what exactly this was doing at the assembly level. A glance at the generated assembly shows that the order of operations is: 1) call srpFoo.Disown() to get the IFoo* 2) call srpBar.Disown() to get the IBar* 3) call map's ope...
Because any pointer can be explicitly converted to aunique_ptr. If we didn’t use aunique_ptrhere we would still have to express “sink” semantics, just in a more brittle way such as by accepting a rawowningpointer (anathema!) and documenting the semantics in comments. Using (c) is va...