static

问题 I have a Java class which I'm working with in Scala. I can instantiate the class, but I don't see how to instantiate a public static class within the outer class from Scala. Can anyone point me to the answer? (I've read lots of posts that say how to use "static" members in Scala code. That is not what I'm looking for.) 回答1: In my case something like that works: Java class package test.java; public class Test { public static class TestInner {} } Scala class package test.scala import test.java

问题 It seems like most web servers (Apache, Nginx, Lighthttpd) serve static files separately from the html files (different configuration). Why is this? I'm trying to deploy my Django app with Apache and the deployment so far has been straightforward. In development the Django server served static files without me bothering to configure it. Why is it different in real webservers? 回答1: It's a performance issue. In a production setup you wouldn't want static content to be served through django.

问题 Can a reasonable decent compiler discard this const static variable class A{ const static int a = 3; } if it is nowhere used in the compiled binary or does it show up anyway in the binary? 回答1: Short answer: Maybe. The standard does not say the compiler HAS to keep the constants (or strings, or functions, or anything else), if it's never used. Long answer: It very much depends on the circumstances. If the compiler can clearly determine that it is not used, it will remove unused constants. If

问题 Can a reasonable decent compiler discard this const static variable class A{ const static int a = 3; } if it is nowhere used in the compiled binary or does it show up anyway in the binary? 回答1: Short answer: Maybe. The standard does not say the compiler HAS to keep the constants (or strings, or functions, or anything else), if it's never used. Long answer: It very much depends on the circumstances. If the compiler can clearly determine that it is not used, it will remove unused constants. If

问题 Can a reasonable decent compiler discard this const static variable class A{ const static int a = 3; } if it is nowhere used in the compiled binary or does it show up anyway in the binary? 回答1: Short answer: Maybe. The standard does not say the compiler HAS to keep the constants (or strings, or functions, or anything else), if it's never used. Long answer: It very much depends on the circumstances. If the compiler can clearly determine that it is not used, it will remove unused constants. If

问题 why or for what reason is it not possible to declare a class member variable in C++ as static mutable ? Something like static mutable int t; //This won't compile For me, there is no reason to ban such declarations. E.g. for reasons like maintaining a global class-wide statistics, it may be convenient to have static variable that can be altered by (logically) const methods. So either this is sort of a misdesign in C++ and unnecessarily complicated, or there is a practical or theoretical reason

问题 This question already has answers here : How to get the name of the calling class in Java? (12 answers) Closed 1 year ago . This is a follow up to more general and similar question/answers In Java 8 I can get class name called the method using new Exception String className = new Exception().getStackTrace()[1].getClassName(); But can I get class name in a static way? edit If I'm inside a different class's method and want to know the class called my method 回答1: Example for getting the class

问题 This question already has answers here : How to get the name of the calling class in Java? (12 answers) Closed 1 year ago . This is a follow up to more general and similar question/answers In Java 8 I can get class name called the method using new Exception String className = new Exception().getStackTrace()[1].getClassName(); But can I get class name in a static way? edit If I'm inside a different class's method and want to know the class called my method 回答1: Example for getting the class

问题 I would like to have a templated class with a static data member, and initialize it by emulating a "static constructor." For a non-templated class, this has already been answered (see static constructors in C++? I need to initialize private static objects and What is a static constructor?). However, none of the answers seem to work for a templated class. The following is an example that tries to adapt the "static constructor" idiom from the previous answers to a templated class. (Note that

问题 I would like to have a templated class with a static data member, and initialize it by emulating a "static constructor." For a non-templated class, this has already been answered (see static constructors in C++? I need to initialize private static objects and What is a static constructor?). However, none of the answers seem to work for a templated class. The following is an example that tries to adapt the "static constructor" idiom from the previous answers to a templated class. (Note that