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What is copy-on-write?

...gy used in computer programming. The fundamental idea is that if multiple callers ask for resources which are initially indistinguishable, you can give them pointers to the same resource. This function can be maintained until a caller tries to modify its "copy" of the resource, at which point a true...
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How to specify different Debug/Release output directories in QMake .pro file

...ke things even easier to switch around, only define your DESTDIRs conditionally, and then use that value in all your other paths: OBJECTS_DIR = $${DESTDIR}/.obj. Cheers! – Xavier Holt Mar 7 '12 at 4:16 ...
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Resize image in PHP

I'm wanting to write some PHP code which automatically resizes any image uploaded via a form to 147x147px, but I have no idea how to go about it (I'm a relative PHP novice). ...
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Mongoose subdocuments vs nested schema

...still have the same subdocument structure. – Martin Hallén Jul 9 '14 at 9:17 2 you should also c...
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Django : How can I see a list of urlpatterns?

... If you want a list of all the urls in your project, first you need to install django-extensions, add it to your settings like this: INSTALLED_APPS = ( ... 'django_extensions', ... ) And then, run this command in your terminal ./manage.py show_...
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Node.js throws “btoa is not defined” error

...se the btoa() and atob() functions which are native in client-side javascript but for some reason weren't included in node. The new directory showed up in my node_modules folder, which itself is in root alongside app.js . Then I made sure to add btoa-atob as a dependency in my package.json ...
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“Unknown provider: aProvider

...that caused this issue, but I have since been able to find the problem manually. There was a controller function declared on the global scope, instead of using a .controller() call on the application module. So there was something like this: function SomeController( $scope, i18n ) { /* ... */ } ...
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C# Sanitize File Name

... And another potentially great SO user goes walking... This function is great. Thank you Adrevdm... – Dan Rosenstark Aug 1 '09 at 2:15 ...
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Using tags to turn off caching in all browsers? [duplicate]

...ifferent http service request. That worked for me, so adding a server side scripting code snippet to automatically update this tag wouldn't hurt: <meta http-equiv="expires" content="timestamp"> share | ...
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How to test code dependent on environment variables using JUnit?

... value); } } For Java 5 to 7 the library System Rules has a JUnit rule called EnvironmentVariables. import org.junit.contrib.java.lang.system.EnvironmentVariables; public class EnvironmentVariablesTest { @Rule public final EnvironmentVariables environmentVariables = new EnvironmentVariab...