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At this point, we have achieved our goal of separating the work of managing pointers from our interface class We can use Handles to implement a wide variety of interface classes, none of which would have to worry about memory management However, our Handle class still has the problem that copying or assigning objects copies the underlying data, even when it does not need to do so The reason being that Handle always copies the object to which the Handle is bound In general, we would like to be able to decide whether we want to make such copies For example, we might want objects that are copies of one another to share their underlying information Such classes do not need or want valuelike behavior Other classes may not have any way of changing state once an object is created In such cases, there is no reason to copy the underlying object Copying such objects would waste time and space To support these kinds of classes, we'd like a kind of Handle that does not copy the underlying object when the Handle itself is copied Of course, if we allow multiple Handles to be bound to the same underlying object, we'll still need to free that object at some point The obvious point at which to free the object is when the last Handle that points to it goes away To this end, we will use a reference count, which is an object that keeps track of how many objects refer to another object Each target object will have a reference count associated with it We will arrange to increment the reference count each time we create a new handle that refers to our target object, and to decrement the reference count each time a referring object goes away When the last referring object goes away, the reference count will become zero At that point we'll know that it is safe to destroy the target object This technique can save a lot of unneeded memory management and copying of data We'll first build a new class, called Ref_handle, which will show how to add reference counts to our Handle class Then, in the next two sections, we'll explore how reference counting can help us define classes that behave like values while sharing representations To add reference counting to a class, we have to allocate a counter, and change the operations that create, copy, and destroy the objects so that they update the counter appropriately Each object to which we have a Ref_handle will have a reference count associated with it The only question is where to store the counter In general, we don't own the source code for the types from which we want to make Ref_handles, so we can't just add the counter to the object class type itself Instead, we'll add another pointer to our Ref_handle class to keep track of the count Each object to which we have attached a Ref_handle will also have an associated reference count that tracks how many copies we have made of that object:. asp.net qr code reader QR Code Scanner in ASP.Net - CodeProject
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After getting that file from your ASP.NET server code, you can try decoding it by using a software-based barcode reader suporting QR Code like ... template <class T> class Ref_handle { public: // manage reference count as well as pointer Ref_handle(): refptr(new size_t(1)), p(0) { } Ref_handle(T* t): refptr(new size_t(1)), p(t) { } Ref_handle(const Ref_handle& h): refptr(hrefptr), p(hp) { ++*refptr; } Ref_handle& operator=(const Ref_handle&); ~Ref_handle(); // as before operator bool() const { return p; } T& operator*() const { if (p) return *p; throw std::runtime_error("unbound Ref_handle"); } asp.net qr code reader Read QR Code Using ASP.NET Barcode Reader - BarcodeLib.com
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