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What does the “Just” syntax mean in Haskell?
...d does. Every Haskell tutorial that I have looked at just starts using it randomly and never explains what it does (and I've looked at many).
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Test if a variable is a list or tuple
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Go ahead and use isinstance if you need it. It is somewhat evil, as it excludes custom sequences, iterators, and other things that you might actually need. However, sometimes you need to behave differently if someone, for instance, ...
Using :after to clear floating elements
I have a list and the li's have a float:left; . The contents after the <ul> should be aligned correctly. Therefore i can build the following:
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Where is Vagrant saving changes to the VM?
I am just starting with Vagrant and I am having a little trouble understanding a few details. I have read through the docs but still am missing a basic concept. When I want to start a Vagrant box I run:
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iOS: Use a boolean in NSUserDefaults
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You can set your boolean by using:
[[NSUserDefaults standardUserDefaults] setBool:YES forKey:@"logged_in"];
[[NSUserDefaults standardUserDefaults] synchronize];
and read it by using this code:
if(![[NSUserDefaults standardUserDefaults] boolForKey:@"logged_in"]) {
[self d...
cancelling a handler.postdelayed process
I am using handler.postDelayed() to create a waiting period before the next stage of my app takes place. During the wait period I am displaying a dialog with progress bar and cancel button.
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Can I use my existing git repo with openshift?
...ave git repo on openshift only? I already have bitbucket / github git repo and would prefer to push there only. Can I simply hook into it so that openshift gets intimation ?
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Use of the MANIFEST.MF file in Java
I noticed that JAR, WAR and EAR files have a MANIFEST.MF file under the META-INF folder.
2 Answers
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How would one call std::forward on all arguments in a variadic function?
I was just writing a generic object factory and using the boost preprocessor meta-library to make a variadic template (using 2010 and it doesn't support them). My function uses rval references and std::forward to do perfect forwarding and it got me thinking...when C++0X comes out and I had a stand...
How to change a DIV padding without affecting the width/height ?
I have a div that I want to specify a FIXED width and height for, and also a padding which can be changed without decreasing the original DIV width/height or increasing it, is there a CSS trick for that, or an alternative using padding?
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