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Why do we need extern “C”{ #include } in C++?
...you won't even need the extern because most system C headers will already account for the fact that they might be included by C++ code and already extern their code.
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MySQL foreign key constraints, cascade delete
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If your cascading deletes nuke a product because it was a member of a category that was killed, then you've set up your foreign keys improperly. Given your example tables, you should have the following table setup:
CREATE TABLE categories (
id int unsigned not null primary key,
name VA...
Border around specific rows in a table?
...st-child, but none support last-child (!) msdn.microsoft.com/en-us/library/cc351024(VS.85).aspx
– mechanical_meat
Mar 22 '09 at 6:08
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Comparison between Corona, Phonegap, Titanium
...per of a web app. Through the PhoneGap javascript APIs, the "web app" has access to the mobile phone functions such as Geolocation, Accelerometer Camera, Contacts, Database, File system, etc. Basically any function that the mobile phone SDK provides can be "bridged" to the javascript world. On the o...
What's an Aggregate Root?
... your client code loads from the repository.
The repository encapsulates access to child objects - from a caller's perspective it automatically loads them, either at the same time the root is loaded or when they're actually needed (as with lazy loading).
For example, you might have an Order object...
How to get a file or blob from an object URL?
... blob url eg. blob:http://127.0.0.1:8000/e89c5d87-a634-4540-974c-30dc476825cc
responseType: 'blob'
}).then(function(response){
var reader = new FileReader();
reader.readAsDataURL(response.data);
reader.onloadend = function() {
var base64data = rea...
Regular expressions in C: examples?
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pcre2_code_free(re);
return Found;
}
Install PCRE using:
wget https://ftp.pcre.org/pub/pcre/pcre2-10.31.zip
make
sudo make install
sudo ldconfig
Compile using :
gcc foo.c -lpcre2-8 -o foo
Check my answer for more details.
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Objective-C: Where to remove observer for NSNotification?
...oc is only a last line of defence against crashing the app due to a later access to a decallocated object. But the proper place to unregister an observer is usually somewhere else (and often, much earlier in the object's life-cycle). I am not trying to say here "Hey, just do it in dealloc and every...
Random row from Linq to Sql
...random rows from a large table, see this: msdn.microsoft.com/en-us/library/cc441928.aspx I don't know if there's a LINQ equivalent.
– jwd
Sep 8 '11 at 22:39
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Simulating tremor (from e.g. Parkinson's Disease) with the mouse on a webpage?
...lize what may be identifier for your system you may try:
user@host:/path$ cat /proc/bus/input/devices | grep mouse
H: Handlers=mouse0 event3
H: Handlers=mouse1 event4
And so possibilities are "event3" and "event4" — but for your system that may have other values. So, if that is different from ...