move

问题 I have a container std::vector and I would like to efficiently split it into sub-ranges with x items in each. The original container is not needed so the items should be moved and not copied into the sub-ranges. I've managed to do the splitting using copying, however I'm unsure how to do it with move assignments? range.insert(range.end(), new_items.begin(), new_items.end()); while(range.size() >= x) { sub_ranges.push_back(std::vector<int>(range.begin(), range.begin() + x)); range = std:

问题 I have a massive number of files in one directory that I need to validate. The problem was, the file explorer takes too much time to load the file list and my whole computer becomes slow. So I wrote the following code to group files by moving certain number of files(shown as %limit% and will be 700) to numbered folders(shown as %DirN% ) for /f "tokens=1-2 delims=:" %%a in ('dir /b /a-d ^|findstr /n /v ".bat .cmd .txt"') do if %%a lss %limit% robocopy "%cd%" "%cd%\%DirN%" "%%b" /mov >nul This

问题 One more time about this, but the related questions do not answer my question. The standard is pretty clear: 12.8 Copying and moving class objects, §9 If the definition of a class X does not explicitly declare a move constructor, one will be implicitly declared as defaulted if and only if — X does not have a user-declared copy constructor, — X does not have a user-declared copy assignment operator, — X does not have a user-declared move assignment operator, — X does not have a user-declared

问题 One more time about this, but the related questions do not answer my question. The standard is pretty clear: 12.8 Copying and moving class objects, §9 If the definition of a class X does not explicitly declare a move constructor, one will be implicitly declared as defaulted if and only if — X does not have a user-declared copy constructor, — X does not have a user-declared copy assignment operator, — X does not have a user-declared move assignment operator, — X does not have a user-declared

问题 I currently have a program that draws lines and rectangles. void mousePressEvent(QMouseEvent *event); void mouseReleaseEvent(QMouseEvent *event); void mouseMoveEvent(QMouseEvent *event); I use mouseMoveEvent to draw temporary preview of a line and when i release i draw the actual line. What I would like to know is how can i make mouseMoveEvent work work only when i have the left mouse button pressed down. I tried the following but then the whole function stops working. void mouseMoveEvent

问题 #include <vector> struct A { int a[100]; }; void foo (const A& a) { std::vector<A> vA; vA.push_back(std::move(a)); // how does move really happen? } int main () { A a; foo(a); } The above code compiles fine. Now everywhere it's written that move avoids copying. Following are my queries: Does the move really work when one deals with a lvalue [non]- const reference? Even with "rvalue reference", how is the copy avoided when the object is inserted into a standard container like above? e.g. void

问题 I'm trying to get a div #sidebar that rests above my main #stream div to move from position left: 565px; to position left: 0px; onClick of one image in the #sidebar div (the red arrow in the images below), and do the reverse onClick of the same image. I know I have to use JavaScript, but I have no idea what the code would be. If possible, I would like to animate the div move too. The pre-clicked state (the arrow will be my link): The post-clicked state: Thanks in advance! 回答1: If you want to

问题 I have an image of a fish - If the user touches the screen I want the fish to "look" at the touched point and move there. If the touch has been moved i want the fish constantly following the touch. How can I do that? 回答1: would be something like this: - (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event { UITouch *tap = [touches anyObject]; CGPoint pointToMove = [tap locationInView:self.view]; CGFloat xdiff = pointToMove.x-myFish.center.x; CGFloat ydiff = pointToMove.y-myFish

问题 Per this presentation, if either the copy constructor or copy assignment operator is "user declared", then no implicit move operations will be generated. Does delete ing the copy constructor or copy assignment operator count as "user declared"? struct NoCopy { NoCopy(NoCopy&) = delete; NoCopy& operator=(const NoCopy&) = delete; }; Will implicit move operations be generated for the NoCopy class? Or does deleting the relevant copy operations count as "user declared" and thus inhibit implicit

问题 How do I move (drag and drop) multiple shapes with d3. I tried putting some shapes in a svg and move the svg - this works but not smoothly. This is what I got so far <html> <head> <script type="text/javascript" src="d3.v3.min.js"></script> <title>Creating SVG groups with D3.js</title> </head> <body> <script type="text/javascript"> // http://tutorials.jenkov.com/svg/g-element.html d3image = d3.select("body"); svgcanvas = d3image.append("svg:svg").attr("width", 700).attr("height", 500); svg1 =