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Accessing inactive union member and undefined behavior?

I was under the impression that accessing a union member other than the last one set is UB, but I can't seem to find a solid reference (other than answers claiming it's UB but without any support from the standard). ...
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When exactly are onSaveInstanceState() and onRestoreInstanceState() called?

The following figure (from the official doc ) describes the well-known lifecycle of an Android activity: 5 Answers ...
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WPF ToolBar: how to remove grip and overflow

In a nested WPF ToolBarPanel-ToolBar-Menu we want to get rid of the grip handle to the left and the overflow area to the right. they are both grayed out, but we'd like them to not be displayed at all. ...
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SQL Server Regular expressions in T-SQL

Is there any regular expression library written in T-SQL (no CLR, no extended SP , pure T-SQL) for SQL Server, and that should work with shared hosting? ...
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Creating a comma separated list from IList or IEnumerable

What is the cleanest way to create a comma-separated list of string values from an IList<string> or IEnumerable<string> ? ...
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What's the point of the X-Requested-With header?

JQuery and other frameworks add the following header: 3 Answers 3 ...
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Git pull without checkout?

I'm used to running git pull and other commands from within a branch I'm working on. But I have set up a development server that several people work on, so I don't want to have to switch branches when I do it. If I want to update an existing branch on the dev server from the github repository we a...
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SqlException from Entity Framework - New transaction is not allowed because there are other threads

I am currently getting this error: 20 Answers 20 ...
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Python: print a generator expression?

... Quick answer: Doing list() around a generator expression is (almost) exactly equivalent to having [] brackets around it. So yeah, you can do >>> list((x for x in string.letters if x in (y for y in "BigMan on campus"))) But you can...
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C# generic “where constraint” with “any generic type” definition?

Let me give example: 2 Answers 2 ...