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What is a mixin, and why are they useful?

... Probably not an issue in this example, but you generally want to put the main base class as the last element within the parenthesis so to create the inheritance chain: Request==>Mixin==>...==>BaseRequest. See here: ianlewis.org/en/mixins-and-python ...
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Is there a range class in C++11 for use with range based for loops?

...:irange, which is a bit more focused in scope. C++20's range library will allow you to do this via view::iota(start, end). share | improve this answer | follow ...
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Which characters are valid in CSS class names/selectors?

What characters/symbols are allowed within the CSS class selectors? I know that the following characters are invalid , but what characters are valid ? ...
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What do (lambda) function closures capture?

...the name and scope of the variable, not the object it's pointing to. Since all the functions in your example are created in the same scope and use the same variable name, they always refer to the same variable. EDIT: Regarding your other question of how to overcome this, there are two ways that com...
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Semantic Issue: Property's synthesized getter follows Cocoa naming convention for returning 'owned'

... the memory management rules for declared properties, too — more specifically, for declared properties’ accessors: You take ownership of an object if you create it using a method whose name begins with “alloc”, “new”, “copy”, or “mutableCopy”. A property named newTitle, whe...
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How to access session variables from any class in ASP.NET?

... } } This class stores one instance of itself in the ASP.NET session and allows you to access your session properties in a type-safe way from any class, e.g like this: int loginId = MySession.Current.LoginId; string property1 = MySession.Current.Property1; MySession.Current.Property1 = newValue;...
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What is the preferred/idiomatic way to insert into a map?

... First of all, operator[] and insert member functions are not functionally equivalent : The operator[] will search for the key, insert a default constructed value if not found, and return a reference to which you assign a value. Obvi...
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Make a div fill up the remaining width

...div> <div id="middle-div"> middle div<br />bit taller </div> </div> divs will naturally take up 100% width of their container, there is no need to explicitly set this width. By adding a left/right margin the same as the two side divs, it's own contents is...
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Removing duplicates from a list of lists

... much easier that it offers good returns on efforts. But sometimes (essentially for "tragically crucial bottlenecks" in deep inner loops of code that's pushing the boundaries of performance limits) one may need to go into much more detail, providing probability distributions, deciding which performa...
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How to make MySQL handle UTF-8 properly

... My understanding is that utf8 within MySQL only refers to a small subset of full Unicode. You should use utf8mb4 instead to force full support. See mathiasbynens.be/notes/mysql-utf8mb4 "For a long time, I was using MySQL’s utf8 charset for databases, tables, and columns, assuming i...