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Why should the “PIMPL” idiom be used? [duplicate]
...rivate: cat_->Purr(); Purr() is not accessible from the outside because by deafult it's private. What am I missing here?
– binaryguy
Aug 14 '15 at 9:20
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Lists: Count vs Count() [duplicate]
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Count() is an extension method introduced by LINQ while the Count property is part of the List itself (derived from ICollection). Internally though, LINQ checks if your IEnumerable implements ICollection and if it does it uses the Count property. So at the end of the...
Update data in ListFragment as part of ViewPager
...ents. The ViewPager is on a vertical phone screen, the lists are not side-by-side.
10 Answers
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Why does Razor _layout.cshtml have a leading underscore in file name?
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That's how Ruby on Rails does it (Partials start with a _ but the Render Partial call does not include the _), and ASP.net MVC has drawn heavy inspiration from it.
No technical reason really, just a convention to clearly show the intent ...
Why are Python's 'private' methods not actually private?
...es us the ability to create 'private' methods and variables within a class by prepending double underscores to the name, like this: __myPrivateMethod() . How, then, can one explain this
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Prefer composition over inheritance?
...ve from Airplane.
Does TypeB want only some/part of the behavior exposed by TypeA? Indicates need for Composition.
e.g. A Bird may need only the fly behavior of an Airplane. In this case, it makes sense to extract it out as an interface / class / both and make it a member of both classes.
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How to print an exception in Python?
...on. Thus I strongly prefer printing the traceback as in the solution below by @Cat Plus Plus! E.g. I had an issue with an invalid unicode character during XML parsing and printing the exception showed only "invalid character" or so. Not very helpful. The full trace showed "UnicodeEncodeError: chara...
What is a segmentation fault?
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Segmentation fault is a specific kind of error caused by accessing memory that “does not belong to you.” It’s a helper mechanism that keeps you from corrupting the memory and introducing hard-to-debug memory bugs. Whenever you get a segfault you know you are doing somethin...
Using IQueryable with Linq
...es (which is what Enumerable uses).
The expression trees can be inspected by your chosen LINQ provider and turned into an actual query - although that is a black art in itself.
This is really down to the ElementType, Expression and Provider - but in reality you rarely need to care about this as a ...
Why isn't the size of an array parameter the same as within main?
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In C++ you can pass the array by reference to the function but you cannot do that in C.
– Prasoon Saurav
Dec 29 '09 at 15:32
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