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By default, each iostream class object contains two ios subobjects: the instance contained within its istream subobject and the instance within its ostream subobject Why is this bad In terms of simple efficiency, storing two copies of the ios subobject wastes storage, because iostream needs only one instance Moreover, the ios constructor is invoked twice, once for each subobject A more serious problem is the ambiguity to which the two instances give rise For example, any unqualified access to an ios member is a compiletime error: Which instance is intended What if the ostream and istream classes initialize their ios subobjects slightly differently How do we ensure a coherent pair of ios values by the iostream class Under the default composition by value mechanism, there is really no good way of ensuring that The language solution is to provide an alternative composition by reference inheritance mechanism: virtual inheritance Under virtual inheritance, only a single, shared base class subobject is inherited regardless of how many times the base class occurs within the derivation hierarchy The shared base class subobject is called a virtual base class Using virtual inheritance, the duplication of base class subobjects and the ambiguities to which the duplication gives rise are removed For the purposes of walking through the syntax and semantics of virtual inheri-tance, we have chosen to use the Panda class as a pedagogical example Within zoological circles, for more than a 100 years there has been an occasionally fierce debate as to whether vb net gs1 128 .NET GS1 - 128 / EAN - 128 Generator for C#, ASP.NET, VB . NET ...
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VB . NET GS1 - 128 / EAN-128 Generator creates barcode GS1 - 128 / EAN-128 images in VB . NET calss, ASP.NET websites. Our virtual inheritance Panda hierarchy is pictured in Figure 184, in which the two dotted arrows indicate a virtual derivation of both Bear and Raccoon from ZooAnimal, and the three solid arrows indicate a nonvirtual derivation of Panda from Bear, Raccoon, and, for good me sure, our Endangered class from Section 182 .net gs1 128 EAN - 128 VB . NET Control - EAN - 128 barcode generator with free VB ...
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... Codabar, Pharmacode, QR, DataMatrix, Aztec - www.free-barcode-generator. net . ... Barcode EAN - 128 ( GS1 - 128 ), encode production date 13-11; Barcode ... If we examine Figure 184, we notice a nonintuitive aspect of virtual inheritance: The virtual derivation (in our case, of Bear and Raccoon) has to be made prior to any actual need for it to be present Virtual inheritance becomes necessary only with the declaration of Panda, but if Bear and Raccoon are not already virtually derived, the designer of the Panda class is out of luck Does this mean that we should derive our base classes virtually just in case sometime down the hierarchical life cycle virtual inheritance may be needed No We strongly recommend against that The performance impact (and added complexity of subsequent class derivations) can be significant; see [LIPPMAN96a] for performance measurements and discussion Are we saying that we should never use virtual inheritance Again, no In practice, however, in nearly all successful uses of virtual inheritance, the entire hierarchical subtree requiring virtual inheritance, such as the iostream library or our Panda subtree, is designed at one time by either the same individual or the project design group In general, unless virtual inheritance provides a solution to an immediate design problem, we recommend against its use Of course, with that said, let's now look at how we might use it Virtual Base Class Declaration A base class is specified as being derived through virtual inheritance by modifying its declaration with the keyword virtual For example, the following declarations make ZooAnimal a virtual base class of both Bear and Raccoon: // the order of the keywords public and virtual // is not significant class Bear : public virtual ZooAnimal { }; class Raccoon : virtual public ZooAnimal { }; file:///F|/WinDDK/resources/CPPPrimer/c++primerhtm (899 / 1065) [2001-3-29 11:32:14] dominating set, but allows a node to be associated with a backbone node that is more than one hop away, depending on stability of the path between that node and its corresponding backbone node In other words, ADB creates a forest of varyingdepth trees, each of which is rooted at a backbone node In high-mobility areas, small local groups of only one or two hops in radius will be formed, which re ects the fact that local topology information is changing frequently and should not be collected in a high amount, because it will be outdated soon On the contrary, relatively static areas will result in larger local groups, since more information can be collected and remains steady The resulting backbone will provide an infrastructure that is adaptive to mobility, which is used to support multicast service for mobile ad hoc networks. The virtual derivation is not an explicit aspect of the base class itself, but rather of its relationship to the derived class As we stated earlier, virtual inheritance provides for composition by reference That is, access of the subobject and its nonstatic members is carried out by indirection This provides the necessary flexibility to combine the multiply inherited virtual base class subobjects into a single shared instance within the derived class At the same time, an object of the derived class can be manipulated through a pointer or a reference to a base class type even though the base class is virtual For example, all of the following Panda base class conversions execute correctly even though Panda is designed as a virtual inheritance hierarchy: gs1-128 vb.net Code 128 Barcode generation in vb . net - Stack Overflow
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