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Why can't I forward-declare a class in a nam>me m>space using double colons?
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Because you can't. In C++ language fully-qualified nam>me m>s are only used to refer to existing (i.e. previously declared) entities. They can't be used to introduce new entities.
And you are in fact "reopening" the nam>me m>space to declare new entities. If the class Class is later def...
How can I pretty-print JSON in a shell script?
... above cases. You can put this in .bashrc and it will be available every tim>me m> in shell. Invoke it like prettyjson_s '{"foo": "lorem", "bar": "ipsum"}'.
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Compiler Ambiguous invocation error - anonymous m>me m>thod and m>me m>thod group with Func or Action
I have a scenario where I want to use m>me m>thod group syntax rather than anonymous m>me m>thods (or lambda syntax) for calling a function.
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How to create a static library with g++?
Can som>me m>one please tell m>me m> how to create a static library from a .cpp and a .hpp file? Do I need to create the .o and the .a? I would also like to know how can I compile a static library in and use it in other .cpp code. I have header.cpp , header.hpp . I would like to create header.a . Test the...
Flask vs webapp2 for Google App Engine
...tarting new Google App Engine application and currently considering two fram>me m>works: Flask and webapp2 . I'm rather satisfied with built-in webapp fram>me m>work that I've used for my previous App Engine application, so I think webapp2 will be even better and I won't have any problems with it.
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git diff file against its last change
...re shown.
--follow is required to see changes that occurred prior to a renam>me m>.
As far as I can tell, this is the only way to imm>me m>diately see the last set of changes made to a file without using git log (or similar) to either count the number of intervening revisions or determine the hash of the co...
Detecting iOS / Android Operating system
I've done som>me m> research, and this question has com>me m> up, but not in the way I intend. I'm building a page for a client that is a QR code landing, which is a place to download an application. So he doesn't have to print out 2 QR codes on a page, I'd like to detect the current operating system (Apple...
How to pip install a package with min and max version range?
I'm wondering if there's any way to tell pip, specifically in a requirem>me m>nts file, to install a package with both a minimum version ( pip install package>=0.2 ) and a maximum version which should never be installed (theoretical api: pip install package<0.3 ).
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Simple Log to File example for django 1.3+
...uly love this so much here is your working example! Seriously this is awesom>me m>!
Start by putting this in your settings.py
LOGGING = {
'version': 1,
'disable_existing_loggers': True,
'formatters': {
'standard': {
'format' : "[%(asctim>me m>)s] %(levelnam>me m>)s [%(nam>me m>)s:%(lin...
Properly close mongoose's connection once you're done
I'm using mongoose in a script that is not m>me m>ant to run continuously, and I'm facing what seems to be a very simple issue yet I can't find an answer; simply put once I make a call to any mongoose function that sends requests to mongodb my nodejs instance never stops and I have to kill it manually wi...