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What is the difference between user variables and system variables?

...eating the environment for an application. System variables are shared for all users, but user variables are only for your account/profile. If you deleted the system ones by accident, bring up the Registry Editor, then go to HKLM\ControlSet002\Control\Session Manager\Environment (assuming your curr...
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Failure [INSTALL_FAILED_ALREADY_EXISTS] when I tried to update my application

... If you install the application on your device via adb install you should look for the reinstall option which should be -r. So if you do adb install -r you should be able to install without uninstalling before. ...
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Difference between “managed” and “unmanaged”

... Unmanaged code compiles straight to machine code. So, by that definition all code compiled by traditional C/C++ compilers is 'unmanaged code'. Also, since it compiles to machine code and not an intermediate language it is non-portable. No free memory management or anything else the CLR provides. ...
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C++ compiling on Windows and Linux: ifdef switch [duplicate]

... @MestreLion The Predef project has since been absorbed into Boost, but all the macros are still listed in the documentation here: boost.org/doc/libs/release/libs/predef/doc/html/index.html – rubenvb Mar 26 '16 at 12:43 ...
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When to make a type non-movable in C++11?

... Herb's answer (before it was edited) actually gave a good example of a type which shouldn't be movable: std::mutex. The OS's native mutex type (e.g. pthread_mutex_t on POSIX platforms) might not be "location invariant" meaning the object's address is part of its va...
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What is the purpose of the '@' symbol in CSS?

...ructs. The @ syntax itself, though, as I mentioned, is not new. These are all known in CSS as at-rules. They're special instructions for the browser, not directly related to styling of (X)HTML/XML elements in Web documents using rules and properties, although they do play important roles in control...
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connect local repo with remote repo

... git remote add origin <remote_repo_url> git push --all origin If you want to set all of your branches to automatically use this remote repo when you use git pull, add --set-upstream to the push: git push --all --set-upstream origin ...
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node.js require all files in a folder?

How do I require all files in a folder in node.js? 14 Answers 14 ...
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Accessing @attribute from SimpleXML

I am having a problem accessing the @attribute section of my SimpleXML object. When I var_dump the entire object, I get the correct output, and when I var_dump the rest of the object (the nested tags), I get the correct output, but when I follow the docs and var_dump $xml->OFFICE->{'...
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How do I run all Python unit tests in a directory?

...it test module is of the form test_*.py . I am attempting to make a file called all_test.py that will, you guessed it, run all files in the aforementioned test form and return the result. I have tried two methods so far; both have failed. I will show the two methods, and I hope someone out there ...