Stack Overflow Weekly Newsletter - Tuesday, May 31, 2016

Have you found help on Stack Overflow? Take just two minutes to sign up now, and you'll be ready to give back when you can. Sign up for Stack Overflow Top new questions this week: Is using an outdated C compiler a security risk? We have some build systems in production which no one cares about and these machines run ancient versions of GCC like GCC 3 or GCC 2. And I can't persuade the management to upgrade it to a more ... c security gcc   asked by Calmarius 88 votes answered by plugwash 57 votes Why is the size of a lambda 1 in C++? I am working with the memory of some lambdas in C++, but I am a bit puzzled by their size. Here is my test code: #include <iostream> #include <string> int main() { auto f = [](){ ... c++ c++11 lambda c++14 sizeof   asked by sdgfsdh 49 votes answered by Yakk 62 votes The fastest C++ algorithm for string testing against a list of predefined seeds (case insensitive) I have list of seed strings, about 100 predefined strings. All strings contain only ASCII characters. std::list<std::wstring> seeds{ L"google", L"yahoo", L"stackoverflow"}; My app constantly ... c++ string windows algorithm   asked by Victor Mezrin 31 votes answered by VermillionAzure 43 votes Why is the F# version of this program 6x faster than the Haskell one? Haskell version(1.03s): module Main where import qualified Data.Text as T import qualified Data.Text.IO as TIO import Control.Monad import Control.Applicative ((<$>)) import ... performance haskell f#   asked by Marko Grdinic 30 votes answered by behzad.nouri 51 votes Why was the register keyword created? While reading Keywords That Aren't (or, Comments by Another Name) by Herb Sutter I came across these lines: That's right, some keywords are semantically equivalent to whitespace, a glorified ... c++ c c++11 language-lawyer   asked by ayushgp 30 votes answered by Theodoros Chatzigiannakis 33 votes Why is statistics.mean() so slow? I compared the performance of the mean function of the statistics module with the simple sum(l)/len(l) method and found the mean function to be very slow for some reason. I used timeit with the two ... python performance mean   asked by Just some guy 29 votes answered by Jivan 46 votes If nullptr_t isn't a keyword, why are char16_t and char32_t? As discussed at Why is nullptr_t not a keyword, it is better to avoid introducing new keywords because they can break backward compatibility. Why then are char16_t and char32_t keywords, when they ... c++ c++11   asked by Brian 25 votes answered by user657267 14 votes Greatest hits from previous weeks: Validate email address in JavaScript? How can an email address be validated in JavaScript? javascript regex validation email email-validation   asked by pix0r 1841 votes answered by sectrean 2203 votes Round to at most 2 decimal places in JavaScript I'd like to round up to 2 decimal places, but only if necessary. Input: 10 1.7777777 9.1 Output: 10 1.78 9.1 How can I do this in JavaScript? javascript decimal rounding decimal-point   asked by stinkycheeseman 923 votes answered by ustasb 1136 votes Can you answer these? Process unaligned part of a double array, vectorize the rest I am generating sse/avx instructions and currently i have to use unaligned load and stores. I operate on a float/double array and i will never know whether it will be aligned or not. So before ... c++ c vectorization   asked by hr0m 5 votes How probabilities are calculated in MS SQL Server Analysis Services - Decision Tree model? I am a new user of MS SSAS models and I'd like to know how the probabilities are being calculated within the node distribution of Decision tree model. Example: I've created a model for sample data ... ssas probability decision-tree   asked by Ramkumar 7 votes Why doesn't this code compile with clang but with gcc This code works perfectly fine with gcc/g++ and msvc but not with clang. It keeps complaining that no matching function for Log was found, what is going on? #include <iostream> template ... c++ c++11   asked by Dr. Jones 14 votes

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