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Why should I declare a virtual destructor for an abstract class in C++?

I know it is a good practice to declare virtual destructors for base classes in C++, but is it always important to declare virtual destructors even for abstract classes that function as interfaces? Please provide some reasons and examples why. ...
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How do I add custom field to Python log format string?

... This is nowaday's python3 best answer – Stéphane May 9 at 13:21 According to docs.python.org/3/howto/loggi...
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Why use pip over easy_install? [closed]

A tweet reads: 9 Answers 9 ...
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How can I return an empty IEnumerable?

...ing involves creating a new instance). – Francis Gagné Jul 12 '10 at 15:40 add a comment  |  ...
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module unsafe for SAFESEH image C++

... .asm files in the solution explorer instead. – Cillié Malan Jul 4 '18 at 9:42 add a comment  |  ...
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how to get the current working directory's absolute path from irb

... edited Jun 25 '17 at 17:45 José Andias 1,58522 gold badges2525 silver badges2626 bronze badges answered Mar 19 '15 at 15:25 ...
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Microsoft Excel mangles Diacritics in .csv files?

...xporting data (using PHP 5.2) into a .csv test file. Example data: Numéro 1 (note the accented e). The data is utf-8 (no prepended BOM). ...
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How do I close a connection early?

...continuing executing, so use with caution. – Eric Dubé Jun 16 '16 at 2:22 @RichardSmith Because the Connection: close...
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What's the difference between the build and create methods in FactoryGirl?

... edited Sep 11 '18 at 21:41 Stéphane Bruckert 17.3k99 gold badges7777 silver badges111111 bronze badges answered Jan 4 '13 at 21:03 ...
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Convert JS Object to form data

... instanceof Blob) in my case to upload my images – Clément Baconnier Dec 18 '19 at 14:41 Works well for me, i added i...