static

问题 It has been years since I worked in C++ , and I've never used CMake before. I'm trying to compile a program called ngmlr, which uses CMake . It worked seamlessly on other systems I tried to build it on. This time around, CMake finds ZLIB ( Found ZLIB: /usr/lib64/libz.so (found version "1.2.3") ), as required by ngmlr , but the subsequent make fails with ld: cannot find -lz . I think I know what's happening: CMake found the dynamic ZLIB library ( libz.so ), but the CMakeLists.txt file requires

问题 How do I restart my score when I reload a screen public class KeepingScore: Monobehaviour; public static int Score; I also have score set as whenever I click on an object, the object is destroyed and gives me a point. void OnMouseDown() KeepingScore.score += 1; Destroy(); I also have a timer where when I run out of time, scene switches to level select menu, where I click on the level again (ie level 1), but then I still see my score back how it was. I know it's static therefore It's still the

问题 Suppose I have a function that will return a large data structure, with the intention that the caller will immediately copy the return value: Large large() { return Large(); } Now suppose I do not want to rely on any kind of compiler optimizations such as return value optimization etc. Also suppose that I cannot rely on the C++11 move constructor. I would like to gather some opinions on the "correctness" of the following code: const Large& large() { static Large large; large = Large(); return

问题 As you can see, I've created (instantiated?) a static array of Corner objects in the object Corner. Is this good form? I want all the Corner object to have access to all the other Corner objects. package Main; public class Corner { private String biome; private static Corner[][] corners; private float elevation, moisture, heat; private boolean isRiver, isLake; private int x, y; public void createArray(int width, int height) { corners = new Corner[width][height]; } public String getBiome() {

问题 I've got a template Singleton class that I use for a certain amount of important components of my code. Using a Singleton code-model is not the point of this question. Now, I'd like to add to this class a static counter that is shared by every class that use this template. Let me code that for you (the code is not exhaustive): template <class T> class Singleton { public: Singleton(const std::string &name){ printf("%s CTOR call #%d\n", name.c_str(), _counter); _counter++; } virtual ~Singleton(

问题 I've got a template Singleton class that I use for a certain amount of important components of my code. Using a Singleton code-model is not the point of this question. Now, I'd like to add to this class a static counter that is shared by every class that use this template. Let me code that for you (the code is not exhaustive): template <class T> class Singleton { public: Singleton(const std::string &name){ printf("%s CTOR call #%d\n", name.c_str(), _counter); _counter++; } virtual ~Singleton(

问题 I've a doubt about this question, not relatively to a specific language: when I write a class, maybe in C++ or Java, the memory for member function code is allocated once or at every instance? So, in certain cases, is it better to write them as static? thanks for replies 回答1: Nope, the data portion of the code is loaded separately from the executable section when the OS loads your program into memory. They reside usually into different memory regions (typically, the executable section is a

问题 In my Android app, I am trying to simply go back to my main Activity once a video that I am playing ends. I have tried many workarounds, but I can't find a way to call StartActivity from the video onCompletionListener - I am getting the "cannot make a static reference to the non-static method startActivity(Intent) from the type Activity" error. I tried getting a context from the Activity that preceded the videoView, and passing that to the intent/startActivity. That allowed the app to compile

问题 This is quite odd, because I have a Character class that can access Frame.dimension.getWidth(); and its partner getHeight(), however when I wanted to use this in the Map class eclipse underlines it and cannot give me feedback. Running the program anyways ends up in java errors stating they can't find the X value of a Map object. Here's the Frame class: package Core; import java.awt.Dimension; import java.awt.Rectangle; import javax.swing.JFrame; public class Frame { static int width = 800,

问题 This question already has answers here : Closed 8 years ago . Possible Duplicate: What is a “static” function? I have seen a function in a global namespace that is declared like this: static int function_name(int a, double* p, int c, float * u) { //do something with these arguments } What the static keyword means here? EDIT: Now when I know what is for static, please explain what advantage gives the restriction of a function to be visible in a file only where it is declared? I mean why I