Stack Overflow Weekly Newsletter - Tuesday, September 30, 2014

Top new questions this week: What is this JavaScript pattern called and why is it used? I'm studying THREE.js and noticed a pattern where functions are defined like so: var foo = ( function () { var tmpObject = new Bar(); return function ( ) { //actual logic using … javascript closures iife   asked by Patrick Klug 45 votes answered by MD. Sahib Bin Mahboob 39 votes Is the behavior behind the Shell Shock vulnerability in Bash documented or at all intentional? A recent vulnerability, CVE-2014-6271, in how bash interprets environment variables was disclosed. The exploit relies on bash parsing some environment variable declarations as function definitions, … bash function security environment-variables shellshock-bash-bug   asked by kojiro 33 votes answered by Barmar 34 votes what does Haskell's <|> operator do? Going through haskell's documentation is always a bit of a pain for me, because all the information you get about a function is often nothing more than just: f a -> f [a] which could mean any … haskell applicative   asked by Electric Coffee 30 votes answered by J. Abrahamson 26 votes Why does GCC implement isnan() more efficiently for C++ <cmath> than C <math.h>? Here's my code: int f(double x) { return isnan(x); } If I #include <cmath> I get this assembly: xorl %eax, %eax ucomisd %xmm0, %xmm0 setp %al This is reasonably clever: ucomisd … c++ c optimization nan constantfolding   asked by John Zwinck 28 votes answered by Rapptz 7 votes Why does adding 0.1 multiple times remain lossless? I know the 0.1 decimal number cannot be represented exactly with a finite binary number (explanation), so double n = 0.1 will lose some precision and will not be exactly 0.1. On the other hand 0.5 can … java floating-point floating-point-precision   asked by icza 27 votes answered by Peter Lawrey 28 votes Why is this function call ambiguous? I'm reading the standard and trying to figure out why this code won't be resolved without a cast. void foo(char c) { } // Way bigger than char void foo(unsigned long int) { } int main() { … c++ integer implicit-conversion unsigned-integer integer-promotion   asked by user4073503 25 votes answered by AndreyT 44 votes Why are std::fstreams so slow? I was working on a simple parser and when profiling I observed the bottleneck is in... file read! I extracted very simple test to compare the performance of fstreams and FILE* when reading a big blob … c++ performance   asked by Felics 24 votes answered by Mats Petersson 11 votes Greatest hits from previous weeks: Edit an incorrect commit message in Git I wrote the wrong thing in a commit message. How do I change the message? I have not yet pushed the commit to anyone. git git-commit git-rewrite-history   asked by Laurie Young 5851 votes answered by EfForEffort 6546 votes How to horizontally center a div in a div? How do I horizontally center a div in a div with CSS (if it's possible at all)? The outer div has 100%: <div id="outer" style="width:100%"> <div id="inner">Foo foo</div> … html css   asked by Lukas 1317 votes answered by Justin Poliey 1501 votes Can you answer these? Is it possible to login automatically in google drive or Dropbox with static credentials, without login popup? I have a requirement in my project like this . Client will place a images in his google drive account/dropbox.I need to display those images in my application from drive/dropbox.I need to give … ios objective-c iphone google-drive-sdk   asked by sunil 4 votes Escape "[]" characters in a semicolon-separated list in CMake I found "[" and "]" might have special meanings in a semicolon-separated list in CMake. When I try this code in CMakeLists.txt: set(XX "a" "b" "[" "]") message("${XX}") foreach(x ${XX}) … cmake   asked by Cheng Li 5 votes How can I establish a secure connection to a websocket on localhost? We have an application which we run on a POS terminal, that should receive data from an application running on the same machine, while displaying content from a remote site which is loaded over HTTPS. … javascript google-chrome https websocket   asked by Oliver Salzburg 5 votes

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