dynamic

问题 I want to set the tintColor of my png Image dynamic. Actuall i am trying to set the color at the state properties and change them with seperate functions with the setState . My code is something like this (Expect that everything works fine above and around the following code snippet): class dynamicImageColor extends Component{ constructor(props) { super(props); this.state = { myDynamicColor: '#ffffff' } } changeColor(bool){ if(bool === true) { this.setState({ myDynamicColor: '#932727' }) }if

问题 I have problems understanding dynamic multithreading. I have this following algorithm: Page 16, MAT-VEC http://mitpress.mit.edu/books/chapters/0262033844chap27.pdf And in the text they say that "for MAT-VEC on an nxn matrix, the parallel initialization loop in lines 3–4 has span theta(lg n)" And my question is why? I'm confused. So if somebody could explain what they mean, it will be a big help. 回答1: First of all, the definition of "span", for those who don't know it, is the length of the

问题 foreach (DataRow dr in dt.Rows) { Rectangle rectangle_timeline = new Rectangle(); rectangle_timeline.Height = 19; rectangle_timeline.Cursor = Cursors.Hand; rectangle_timeline.Effect = new DropShadowEffect { Color = new Color { A = 255, R = 0, G = 0, B = 0 }, Direction = 315, ShadowDepth = 5, Opacity = 1 }; Grid_Timeline.Children.Add(rectangle_timeline); } I dynamically add a Rectangle with above simple code as shown image. However, sometimes, randomly, there're rectangles without

问题 This question already has answers here : dynamically call local function in javascript (5 answers) Closed 4 years ago . I'm having a difficulty calling a function inside of another function when its name is in a variable: var obj = {} obj.f = function() { var inner = { a: function() { function b() { alert('got it!'); } b(); // WORKS AS EXPECTED x = 'b'; [x](); // DOESN'T WORK, NEITHER this[x]() window[x](), etc. } } inner.a(); } obj.f(); I tried prefixing [x]() with different scope paths but

问题 I've been using async (and .Net 4.5 really) for the first time recently, and I've come across something that has me stumped. There isn't much information about the VoidTaskResult class that I can find on the Net so I came here to see if anyone has any ideas about what is going on. My code is something like the following. Obviously, this is much simplified. The basic idea is to call plugin methods, which are asynchronous. If they return Task , then there is no return value from the async call.

问题 I have got a small problem with 1D array in c++. I have got a function line this: void func(int (&array)[???]) { // some math here; "for" loop { array[i] = something; } } I call the functions somewhere in the code, and before I made math I'm not able to know dimension of the array. The array goes to the function as a reference!, because I need it in the main() function. How I can allocate array like this?, so array with ?? dimension goes to the function as reference then I have to put the

问题 This question already has answers here : Cast delegate to Func in C# (8 answers) Closed 4 years ago . I have the following delegate defined: public delegate object MyDelegate(dynamic target); And I have a Func<dynamic, object> object: Func<dynamic, object> myFunc How can I convert myFunc to MyDelegate ? I have tried these instructions, none of them worked: MyDelegate myDeleg = myFunc; MyDelegate myDeleg = (MyDelegate) myFunc; MyDelegate myDeleg = myFunc as MyDelegate; 回答1: You can wrap the

问题 How do you tell Visual C++ Express 2008 to statically link runtime libraries instead of dynamically? My exes do not currently run on computers w/o some sort of VS installed and I would love to change that. :) 回答1: Sorry, I do not have VC++ Express to test, but in Standard edition I use Project Properties -> Configuration Properties -> C/C++ -> Code Generation -> Runtime Library. Dll and Dll Debug are for dynamic linking. 回答2: Are you 100% sure that you want to do this? Please consider that if

问题 I have to add more than one buttons on a LinearLayout. But I want to put those buttons say 5px apart. I could not find a way to set a margin of a Button. Any idea? 回答1: Use the layout_margin property of the button element. Does that not work? <Button android:layout_margin="5px" (...)/> Edit When creating a button in java, LayoutParams is used to specify margins and so. Button button = new Button(); (....) params = new LinearLayout.LayoutParams(); params.leftMargin = 5; (set params as you need

问题 I'm writing a relatively simple Python script which supports a couple of different commands. The different commands support different options and I want to be able to pass the options parsed by argparse to the correct method for the specified command. The usage string looks like so: usage: script.py [-h] {a, b, c} ... script.py: error: too few arguments I can easily call the appropriate method: def a(): ... def b(): ... def c(): ... if __name__ == "__main__": parser = argparse.ArgumentParser(