move

问题 Consider the following piece of code: struct foo { std::string id; }; int main() { std::vector<foo> v; { foo tmp; v.push_back(std::move(tmp)); } } LIVE DEMO In the piece of code demonstrated: The default constructor of class foo is going to be invoked for the construction of object tmp . The move constructor of class foo is going to be invoked in the statement v.push_back(std::move(tmp)); . The destructor of class foo is going to be invoked twice. Questions: Why the destructor of a moved from

问题 I am reading about the std::move, move constructor and move assignment operator. To be honest, all I got now is confusion. Now I have a class: class A{ public: int key; int value; A(){key = 3; value = 4;} //Simple move constructor A(A&& B){ A.key = std::move(B.key); A.value = std::move(B.value);} }; I thought B is an rvalue reference, why you can apply std::move to an ravlue reference's member? After B.key and B.value have been moved, both have been invalidated, but how B as an object of

问题 Is it possible for a bat file to search through a folder and look at the file names and only move files with that name or part of that name in it? Then move them into a specified location. For example: Parent Folder Arrow0273.text Arrow0314.text Spear083112.text Spear0832.text Sheild087.txt Sheild87.txt Move only the files with “Arrow” in their name into folder location “A”. ect... Thanks Guys! Edit: Found this but not sure if it is what I'm looking for, and to be honest, not sure how that

问题 I'm trying to do something new with my app. I have a number of buttons that I'd like the user to be able to rearrange on the screen by dragging them. The view is currently created via Interface Builder. The ideal implementation would check for a flag in NSUserDefaults which if present would allow the user to move the object, drop it,then remove the flag which would save the setup for next time the user loads. Anyone know if anything like this would be possible? 回答1: You can have it done by

问题 What is the best process of moving a 200+ MB DotNetNuke site from Professional to Community edition? I am asking the Stackoverflow community since DotNetNuke's standard line is "there is no supported option to switch from PE to CE", or to contact their customer support. However DNN support told a fellow team member tell us that it was not possible to go from Professional to Community, so that was a waste of time. Based on research there are a couple possibilities for doing this: Create a new

问题 I can't get the mouse move event when using the evtest tools to test the input events . I just get three mouse events: left click event: type = EV_KEY, code = 272 (LeftBtn), value=1/0 right click event: type = EV_KEY, code = 273 (RightBtn), value = 1/0 mouse wheel event: type = EV_REL, code = 8 (Wheel), value = -1 No mouse move event . So where my mouse move event and how to capture it? ps: Tested on Ubuntu 11.04 and Gentoo in VirtualBox-4 with virtualBox-addition installed. 回答1: If not on an

问题 I'm trying to speed up Eclipse by having my projects on a RAM disk (stuck with a slow laptop and a heavy kind of eclipse project at the moment). Worked great for loading the project and such, but when I'm building it seems to read and write a lot to a directory in %APPDATA% (seems to have a generated name from the name of the project). This makes it actually go slower than usual... So... is there a way I can move the tmp directory of eclipse? Preferably without moving the tmp directory of

问题 I have a base class and its subclass: class Base { public: virtual void hi() { cout << "hi" << endl; } }; class Derived : public Base { public: void hi() override { cout << "derived hi" << endl; } }; Trying to create a helper function that creates a unique pointer of a Derived object. 1) This one works: std::unique_ptr<Base> GetDerived() { return std::make_unique<Derived>(); } 2) But, this one fails to compile: std::unique_ptr<Base> GetDerived2() { auto a = std::make_unique<Derived>(); return

问题 so I got this working: -(void) ccTouchesMoved:(NSSet *)touches withEvent:(UIEvent *)event { UITouch *myTouch = [touches anyObject]; CGPoint location = [myTouch locationInView:[myTouch view]]; location = [[CCDirector sharedDirector] convertToGL:location]; for( UITouch *touch in touches ) { CGPoint touchLocation = [touch locationInView: [touch view]]; CGPoint prevLocation = [touch previousLocationInView: [touch view]]; touchLocation = [[CCDirector sharedDirector] convertToGL: touchLocation];

问题 so I got this working: -(void) ccTouchesMoved:(NSSet *)touches withEvent:(UIEvent *)event { UITouch *myTouch = [touches anyObject]; CGPoint location = [myTouch locationInView:[myTouch view]]; location = [[CCDirector sharedDirector] convertToGL:location]; for( UITouch *touch in touches ) { CGPoint touchLocation = [touch locationInView: [touch view]]; CGPoint prevLocation = [touch previousLocationInView: [touch view]]; touchLocation = [[CCDirector sharedDirector] convertToGL: touchLocation];