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Getting time elapsed in Objective-C
...ate];
// do stuff...
NSTimeInterval timeInterval = [start timeIntervalSinceNow];
timeInterval is the difference between start and now, in seconds, with sub-millisecond precision.
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How to migrate back from initial migration in Django 1.7?
I created a new app with some models and now I noticed that some of the models are poorly thought out. As I haven't committed the code the sensible thing would be to migrate the database to last good state and redo the migration with better models. In this case the last good state is database where ...
C# code to validate email address
...user experience. Assuming the e-mail address is valid, you could look for known top-level domains, check the domain for an MX record, check for spelling errors from common domain names (gmail.cmo), etc. Then present a warning giving the user a chance to say "yes, my mail server really does allow ???...
When should you not use virtual destructors?
...truction.
For the ellipsis case, it is no longer undefined behavior it is now conditionally-supported with implementation-defined semantics (N3937 - ~C++ '14 - 5.2.2/7):
...Passing a potentially-evaluated argument of class type (Clause 9) having a non-trivial copy constructor, a non-trivial mov...
Maximum number of records in a MySQL database table
...is before... i just surpassed my 64 terrabyte size on one of my tables and now my system is so slow!
– JM4
Nov 30 '10 at 1:00
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Is it valid to have a html form inside another html form?
...he problem with using such approaches is that the behavior of your code is now not guaranteed across browsers. (since it's not standard)
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mingw-w64 threads: posix vs win32
... on Windows and there are two options: win32 threads and posix threads. I know what is the difference between win32 threads and pthreads but I don't understand what is the difference between these two options. I doubt that if I will choose posix threads it will prevent me from calling WinAPI functio...
How can I reverse a NSArray in Objective-C?
... danielpunkass's solution. I used it thinking it was a great shortcut, but now I've just spent 3 hours trying to figure out why my A* algorithm was broken. It's because it returns the wrong set!
– Georg Schölly
Mar 12 '10 at 6:23
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How do I create delegates in Objective-C?
I know how delegates work, and I know how I can use them.
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How to make a copy of a file in android?
...d I found the problem was missing permission to write to external storage. now it works fine.
– A S
Feb 16 '12 at 9:51
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