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USJeff
 

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    1. POIs the Visitor Pattern the fastest way to differentiate parameter types in C++?
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    3. POnon-deferred static member initialization for templates in gcc?
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    1. PObest alternative to in-definition initialization of static class members? (for SVN keywords)
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    2. POshielding #include within namespace { } block?
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    3. POnon-resizeable vector/array of non-reassignable but mutable members?
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      1. POHow do I make an arbitrary Perl regex wholly non-capturing? (Answer: You Can't)
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      1. POGetting Filename from file descriptor in C
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      1. POHow to automatically generate a stacktrace when my gcc C++ program crashes
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    1. CO@Martin: Right, that is the effect that I want and sometimes actually use already, where A is actually a reciprocally friended interface to some restricted access class Z. The common complaint with the normal Attorney-Client Idiom seems to be that the interface class A has to boilerplate call wrappers to Z, and in order to extend access to subclasses, A's boilerplate has to be essentially duplicated in every base class like B. An interface normally expresses what functionality a module wants to offer, not what functionality in others it wants to use itself.
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    2. CO@Martin: Right, in this scheme the friended base could be used to get at the friending class, which could be simple encapsulation violation in many (if not most) cases. However, in situations where the friended base is an abstract class, any derived class would be coerced into implementing a reciprocal interface of its own. I'm not sure whether an 'impostor' class in this scenario would be considered to be breaking encapsulation or to be violating an interface contract if it didn't try to faithfully act its claimed role properly.
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    3. COFriendship, although given through declarations like members, aren't really members so much as notifications of which other classes can essentially ignore the visibility classifications on 'real' members. While the spec sections you quote explain how the language operates regarding these nuances and frames behavior in self-consistent terminology, things could have been crafted differently, and nothing above gets to the heart of the rationale, unfortunately.
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