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How can I reset a react component including all transitively reachable state?
...en you say 'component will be thrown away and created from scratch' do you mean the virtual DOM will be thrown away and created from scratch but the DOM updates will still happen based on the diff algorithm?
– nimgrg
Feb 13 '14 at 20:37
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How to switch a user per task or set of tasks?
...dded to set these values for the duration of a play. @Brett so does that mean the succeeding tasks after this will be ran by some_user and not the original user remote_user which was used to connect to the host, is that correct?
– JohnnyQ
May 20 '16 at 3:47
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URL-parameters and logic in Django class-based views (TemplateView)
... it at the class level. So for example, you are using a TemplateView which means that you would do the logic in your get_context_data override.
– Ngenator
Apr 2 '13 at 12:58
4
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Why is address zero used for the null pointer?
... am adviced to set pointers to zero after freeing their memory, because it means freeing the pointer again isn't dangerous; when I call malloc it returns a pointer with the value zero if it can't get me memory; I use if (p != 0) all the time to make sure passed pointers are valid, etc.
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How to diff a commit with its parent?
...t is formed by a commit and its
parent commits exist. The r1^@ notation means all parents of r1. r1^!
includes commit r1 but excludes all of its parents.
This means that you can use 15dc8^! as a shorthand for 15dc8^..15dc8 anywhere in git where revisions are needed. For diff command the...
Cast int to varchar
I have below query and need to cast id to varchar
8 Answers
8
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Const before or const after?
... of the current declaration to a pointer type. Encountering const after * means the const qualifier is applied to a pointer declaration; encountering it prior to the * means the qualifier is applied to the data pointed to.
Because the semantic meaning does not change if the const qualifier appears...
Why does Environment.Exit() not terminate the program any more?
...Exception to try to avoid the WER dialog legitimate in the first place? I mean, if there's an unhandled exception, the WER dialog is supposed to show, isn't it?
– Harry Johnston
Aug 8 '13 at 1:56
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Spring 3 RequestMapping: Get path value
... HandlerMapping.PATH_WITHIN_HANDLER_MAPPING_ATTRIBUTE:
@RequestMapping("/{id}/**")
public void foo(@PathVariable("id") int id, HttpServletRequest request) {
String restOfTheUrl = (String) request.getAttribute(
HandlerMapping.PATH_WITHIN_HANDLER_MAPPING_ATTRIBUTE);
...
}
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.NET - Dictionary locking vs. ConcurrentDictionary
...read all work on the same "snapshot" of its internal data structure, which means that if you have code like this:
if (tree.Count > 0)
Debug.WriteLine(tree.First().ToString());
you might get a NullReferenceException because inbetween tree.Count and tree.First(), another thread has cleared o...