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How are software license keys generated?
...very large cryptographically-secure random number.
Store it in our database and print it on the card.
Then, when someone enters a playtime-card number, check if it's in the database, and if it is, associate that number with the current user so it can never be used again.
For online servic...
Ignoring accented letters in string comparison
...Standard defines combining characters as characters that are combined with base characters to produce a new character. Nonspacing combining characters do not occupy a spacing position by themselves when rendered."
– Avlin
Apr 24 '14 at 9:15
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Default value to a parameter while passing by reference in C++
...ts to virtual functions in derived class, which overloading avoids:
class Base {
public:
virtual void f1 (int i = 0); // default '0'
virtual void f2 (int);
inline void f2 () {
f2(0); // equivalent to default of '0'
}
};
class Derived : public Base{
public:
virt...
List files ONLY in the current directory
...
This is what I needed in the end [os.path.join(path_base,f) for f in os.listdir(path_base) if os.path.isfile(os.path.join(path_base,f))]
– citynorman
Jan 5 '18 at 18:55
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What is a clearfix?
... Disagree that display: inline-block is better than floats for block-based layout. Inline-blocks are, as their name implies, laid inline - most layouts are block-based and having these blocks be laid out in an inline formatting context just doesn't make sense. You also have to deal with variou...
looping through an NSMutableDictionary
...
For simple loop, fast enumeration is a bit faster than block-based loop
It's easier to do concurrent or reverse enumeration with block-based enumeration than with fast enumeration
When looping with NSDictionary you can get key and value in one hit with a block-based enumerator, wherea...
Setting Android Theme background color
...
<resources>
<!-- Base application theme. -->
<style name="AppTheme" parent="android:Theme.Holo.NoActionBar">
<item name="android:windowBackground">@android:color/black</item>
</style>
</resources...
Resolving a 'both added' merge conflict in git?
...cause git creates the .LOCAL and .REMOTE files for the merge, but not the .BASE file. I think it should just create an empty .BASE file. If you manually create the empty .BASE file, the merge tool works fine.
– Jez
Mar 22 '12 at 14:29
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MongoDB SELECT COUNT GROUP BY
...
I need some extra operation based on the result of aggregate function. Finally I've found some solution for aggregate function and the operation based on the result in MongoDB. I've a collection Request with field request, source, status, requestDate.
...
Difference between session affinity and sticky session?
...rver to send to.
Bad if you have to support cookie-less browsers
Partition based on the requester's IP address.
Bad if it isn't static or if many come in through the same proxy.
If you authenticate users, partition based on user name (it has to be an HTTP supported authentication mode to do this).
D...