Stack Overflow Weekly Newsletter - Tuesday, March 29, 2016

Top new questions this week: Why does BufferedInputStream copy a field to a local variable rather than use the field directly When I read the source code from java.io.BufferedInputStream.getInIfOpen(), I am confused about why it wrote code like this: /** * Check to make sure that underlying input stream has not been * ... java   asked by Saint 45 votes answered by Stephen C 48 votes Why cube is faster than square I wrote this: var max = 0xffffff * 4; var step = 1 / max; function cube() { var result = 0.; for (var x = 0.; x < 1; x += step) { result += x * x * x; } return result; ... javascript performance   asked by shal 27 votes answered by Siderite Zackwehdex 0 votes Query the alignment of a specific variable C++11 introduced the alignas specifier to specify the alignment of a variable, and the alignof operator to query the default alignment of a type. However, I don't see any way to get the alignment of a ... c++ c++11 memory-alignment   asked by Morwenn 25 votes answered by manlio 6 votes What is the logic behind this result? def foo(_, _='override') _ end p foo("bye bye") p foo("hello", "world") Output: "override" "hello" I could understand if the result was: "override" "world" or even: "bye bye" "hello" But ... ruby   asked by Gerry 21 votes answered by Mike 2 votes How to prevent implicit conversion from int to unsigned int? Suppose you have this: struct Foo { Foo(unsigned int x) : x(x) {} unsigned int x; }; int main() { Foo f = Foo(-1); // how to get a compiler error here? std::cout << f.x ... c++ implicit-conversion unsigned-integer   asked by tobi303 19 votes answered by skypjack 16 votes What's the right way to fix this template resolution ambiguity? Suppose I've written: template <typename T, typename = std::enable_if_t<std::is_integral<T>::value>> void foo() { std::cout << "T is integral." << std::endl; } template ... c++ c++11 c++14 sfinae enable-if   asked by einpoklum 19 votes answered by Barry 10 votes C++ array sizes without constant expressions I'm reading Stroustrup's A Tour of C++. On page 9, he states: "The size of an array must be a constant expression." Yet later, on pg. 16, he uses the following code sample: void vector ... c++ arrays   asked by George 19 votes answered by Barry 28 votes Greatest hits from previous weeks: How can I know which radio button is selected via jQuery? I have two radio buttons and want to post the value of the selected one. How can I get the value with jQuery? I can get all of them like this: $("form :radio") How do I know which one is selected? ... javascript jquery jquery-selectors radio-button   asked by juanformoso 1463 votes answered by Peter J 2520 votes Difference between INNER and OUTER joins What is the difference between INNER JOIN and OUTER JOIN? How do LEFT JOIN, RIGHT JOIN, and FULL JOIN fit in? sql join inner-join outer-join difference   asked by cdv 2650 votes answered by Mark Harrison 3828 votes Can you answer these? How to merge adjacent polygons I'm using a Javascript implementation of Fortune's algorithm to compute voronoi cells (https://github.com/gorhill/Javascript-Voronoi). My sites to compute are points on a map (so (lat,lng)). I first ... javascript geometry leaflet voronoi turfjs   asked by kwn 5 votes Bootstrap navbar "flashing" when clicking outside of menu to close it I'm having an issue with the navbar where a "flash" appears when you click outside the menu to close the menu. The flash persists if the mouse is held down when clicking out of the menu as shown here: ... html css angularjs twitter-bootstrap   asked by Left 6 votes Phaser Custom Sprite Trapezoidal Shape I want to create something like this using Phaser Javascript Framework here is a sample of a reference on creating a trapezoidal image transformation using canvas Trapezoid - JSFiddle and here is a ... javascript html html5 canvas phaser-framework   asked by Oli Soproni B. 6 votes

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