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The advantage of automatically generated template code is thus a disadvantage when code size matters Because Symbian OS code is deployed on mobile phones with limited ROM and RAM sizes, it is important to avoid code bloat Using templated classes, such as CDynamicArray above, expands the code size too signi cantly To avoid this, but still reap the bene ts of C++ templates, Symbian OS makes use of the thin template pattern This chapter describes the pattern in more detail, so you have a good idea of how the system code works If you intend to use C++ templates1 in your code on Symbian OS, you should endeavor to use this pattern to minimize code size Let s onsider the theory rst, and then look at a couple of examples of the use of thin templates in Symbian OS code The thin template idiom works by implementing the necessary code logic in a generic base class that uses type-unsafe TAny* pointers rather than a templated type This code is liable to misuse because of the lack of type-checking, so typically these methods will be made protected in the base class to prevent them being called naively A templated class will then be de ned which uses private inheritance2 from this class to take advantage of the generic implementation The derived class declares the interface to be used by its clients and implements it inline in terms of the base class I ll show an example of this from Symbian OS code shortly Since the derived class uses templates, it can be used with any type required It is type-safe because it is templated and thus picks up the use of an incorrect type at compile time There are no additional runtime costs because the interfaces are de ned inline, so it will be as if the caller had used the base class directly And importantly, since the base class is not templated, only a single copy of the code is generated, regardless of the number of types that are used For illustration purposes, here is just a small part of the RArrayBase class and its subclass RArray (from e32stdh and e32stdinl) The type-unsafe base class (RArrayBase) implements the code logic for the array but cannot be used directly because all its methods are protected You ll nd a detailed discussion of the RArray class, and other Symbian OS container classes, in 7.

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Paint Barcode In C#.NET Using Barcode maker for Visual . Code-128 In Visual Basic .NET Using Barcode encoder for .Although the edit and update actions from Section 101 are functionally complete, they suffer from a ridiculous security flaw: they allow anyone ( even non-signed-in users) to access either action and any signed-in user can update the information for any other user5 In this section, we ll implement a security model that requires users to be signed in and prevents them from updating any information other than their own Users who aren t signed in and who try to access protected pages will be forwarded to the signin page with a helpful message, as mocked up in Figure 105.Related: EAN-8 Generation .NET WinForms , .NET Data Matrix Generator , EAN-8 Generation ASP.NET

If you remove something from an API which is used by an external component, that component s code will no longer compile against the API (a break in source compatibility) nor run against its implementation (a break in binary compatibility) Thus, at n API level, you should not remove any externally-visible class, function, enumeration (or any value within an enumeration) or global data, such as string literals or constants At a class level, you should not remove any methods or class member data Even private member data should not be removed, in general, because the size of the resulting object will change, which should be avoided for reasons described above. Bar Code In Java Using Barcode generator for Java .Related: .NET Intelligent Mail Generation

The Cost of Sharing Let's see specifically why locality is important and what the effects of not paying attention to it can be When more than one processor shares access to a ocation in memory that resides on the same cache line, coherence traffic will increase and can negatively impact performance This is especially bad when the processors are performing writes, because it requires invalidation of lines in local processor caches This is particularly true of atomic (interlocked) operations because they must acquire cache lines in exclusive (E) mode Contention like this can even lead to an exclusive bus lock on older memory architectures What's worse, false sharing often leads to the symptoms of sharing, but is not always evident in the program This happens when two different memory locations are spatially collocated in memory, but logically distinct in the program For heap memory this is often a byproduct of how memory gets allocated In NET, the server GC has processor local heaps and so allo cations on separate processors should be physically separate enough to avoid this issue Similarly, many native memory allocators have processor local pools of free pages; this is primarily to avoid contention, but also helps. haring = { a } " , woutSha ri ng ) j Console Write L . EAN128 Drawer In Java Using Barcode maker for Java Control .Related: Java Data Matrix Generator , EAN-8 Generation Word , VB.NET Intelligent Mail Generating

COMPATIBILITY. QR Code Encoder In .NET Using Barcode encoder . the class has a virtual destructor The reasons for this rule are fairly straightforward First, the size of memory required for an object to be allocated on the stack is determined for each component at build time, and to change the size of an object would affect previously compiled client code, unless the client is guaranteed to instantiate the object only on the heap, say by using a NewL() factory function Additionally, access to data members within an object occurs through an offset from the this pointer If the class size is changed say by adding a data member, the offsets of the data members of derived classes are rendered invalid To ensure that an object of a class cannot be derived or instantiated except by members (or friends) of the class, it should have private, non-inline and non-exported constructors It is not suf cient simply not to declare any constructors for the class, since the compiler will then generate an implicit, public default constructor On Symbian OS, all C classes derive from CBase, which de nes a protected default constructor, and prevents the compiler from generating an implicit version2 If your class needs a default constructor, you should simply de ne it as private and implement it in source, or at least, not inline where it is publicly accessible Here s a de nition for a typical, non-derivable class:. In Visual Basic .NET Using Barcode generator for Visual .Related:

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