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Subtract 7 days from current date
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If you're running at least iOS 8 or OS X 10.9, there's an even cleaner way:
NSDate *sevenDaysAgo = [[NSCalendar currentCalendar] dateByAddingUnit:NSCalendarUnitDay
value:-7
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What does multicore assembly language look like?
...rdware gives to multi-threaded operation.
Nicholas Flynt had it right, at least regarding x86. In a multi threaded environment (Hyper-threading, multi-core or multi-processor), the Bootstrap thread (usually thread 0 in core 0 in processor 0) starts up fetching code from address 0xfffffff0. All th...
What algorithm can be used for packing rectangles of different sizes into the smallest rectangle pos
... and from top to bottom (called reverse-level) until the total width is at least 1/2. Then the reverse-level is dropped down until (at least) one of them touches some item below. The drop down is somehow repeated.
Approximation ratio: RF(I) <= 2·OPT(I).
Steinberg's algorithm
Steinberg's algorith...
Is gcc's __attribute__((packed)) / #pragma pack unsafe?
...x member is properly aligned. With an array of two struct foo objects, at least one or the other will have a misaligned x member.)
(In this case, p0 points to a misaligned address, because it points to a packed int member following a char member. p1 happens to be correctly aligned, since it points...
Abstract class in Java
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A Java class becomes abstract under the following conditions:
1. At least one of the methods is marked as abstract:
public abstract void myMethod()
In that case the compiler forces you to mark the whole class as abstract.
2. The class is marked as abstract:
abstract class MyClass
As al...
Why do 64-bit DLLs go to System32 and 32-bit DLLs to SysWoW64 on 64-bit Windows?
...OSEFULLY giving it such a misleading name?!? Shame on them!!! Why not AT LEAST actually name the directory "SysWin32OnWin64" to avoid confusion?!? And what happens when they eventually produce a 128-bit OS ... then where are they going to put their 32-bit, 64-bit, and 128-bit DLLs?!?
All of this ...
How to convert unix timestamp to calendar date moment.js
... Yes, that was the solution with the latest version of moment, or at least the one i got from npm recently. even though i got the .unix() from moment i had to * 1000 when instantiating it again. for instance: moment( moment().unix() * 1000 )
– kroe
Nov 19...
Very simple log4j2 XML configuration file using Console and File appender
...or some reason it doesn't always copy the log4j.xml even if it changed. At least that's what solved it for me.
– Reut Sharabani
May 5 '15 at 13:07
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Add a new item to a dictionary in Python [duplicate]
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@ChrisEberle and either should be O(1), or at least quite close to it, is that right?
– user3067923
Sep 7 '17 at 22:56
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Quickly find whether a value is present in a C array?
...t you can do with hand tuned assembly language. I tend to take the path of least resistance - for small routines like this, I just write asm code and have a good idea how many cycles it will take to execute. You may be able to fiddle with the C code and get the compiler to generate good output, but ...