static

What does it mean when the function in global namespace is declared as static C++? [duplicate]

由 限于喜欢 提交于 2020-01-04 06:34:27
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

Serving static html files using DefaultServlet on embedded Jetty

由 安稳与你 提交于 2020-01-04 04:13:54
问题 I'm working on a project that needs to be self contained so I've decided to embed Jetty in my app. I'm gonna be serving static HTML pages, a few JSP pages, and also will be using some custom servlets. I've found a perfect example of how to setup the embedded Jetty to accomplish all of this (http://thinking.awirtz.com/2011/11/03/embedded-jetty-servlets-and-jsp/), however, since this is the first time I'll be using Jetty and working with JSP pages or servlets, I've got a few basic questions.

Input process and type for static uint8_t array

由 ℡╲_俬逩灬. 提交于 2020-01-04 03:25:34
问题 I am currently trying to convert an integer variable to the value of a static uint8_t array in the Arduino IDE. I am using: #include <U8x8lib.h> And I do understand that uint8_t acts similarly to the byte type. Currently, the array has a set value: static uint8_t hello[] = "world"; From my perspective, "world" looks like a string, so I thought I would start with creating a string variable: String world = "world"; static uint8_t hello[] = world; This did not work and gave me the error:

isset on static class attributes

由 戏子无情 提交于 2020-01-04 03:12:13
问题 class A { public static $foo = 42; } $class = 'A'; $attribute = 'foo'; var_dump(isset($class::$attribute)); //gives bool(false) How can i checkt, of this static attribute exists in this class? 回答1: Use variable variables: var_dump(isset($class::$$attribute)); // the two dollars are intentional If you don't have PHP 5.3 yet the only accurate way is probably using the Reflection API: $reflectionClass = new ReflectionClass($class); $exists = $reflectionClass->hasProperty($attribute) &&

Is static deprecated when ensuring availability between translation units?

由 旧时模样 提交于 2020-01-04 01:38:10
问题 From the following stackoverflow answer, the user says: It means that the variable is local to a translation unit (simply put, to a single source file), and cannot be accessed from outside it. This use of static is in fact deprecated in the current C++ Standard - instead you are supposed to use anonymous namespaces: static int x = 0; should be: namespace { int x = 0; } I don't disagree that anonymous namespaces are the preferred method, but is using static really deprecated now? Where does

VS 2010 C++ IntelliSense “a storage class may not be specified here” even though it can?

由 本小妞迷上赌 提交于 2020-01-04 01:28:48
问题 This is a fairly minor question, but it's annoying me: IntelliSense seems to be convinced that declaring static variables at the function-scope in an if condition is an error, and complains about it. Only it builds just fine, and even the MSDN docs mention it as a legitimate usage. I'd really like to get rid of the wavy red line, because it comes up fairly often (it's used in a macro I use regularly). Here's the code, as an example, though it's not the only example in my program: MyForm:

Nginx 实现静态资源

由 邮差的信 提交于 2020-01-03 21:25:39
前言 nginx作为一款高性能的服务器，用途非常多，除了可以做后端服务器的代理，负载均衡之外，还有一个用途就是做 静态资源的缓存服务器 ，比如在 前后端分离 的项目中，为了加速前端页面的响应速度，我们可以将前端的相关资源，例如html，js,css或者图片等放到nginx指定的目录下，访问的时候只需要通过IP加路径就可以实现高效快速的访问， 1、基础环境 1.机器规划 hostname ip role web01 10.0.0.7 flask进程（端口5000） lb01 10.0.0.5 提供Nginx静态资源访问和反向代理 2.我自己写了一个基于flask_restful的flask小项目，目录结构为 flask-demo： https://pan.baidu.com/s/1PMx-ULDbQ5FEhlfZchWH9Q [root@web01 ~]# tree flask-demo flask-demo ├── app │ ├── api # 接口文件 │ │ ├── base.py │ │ ├── home.py │ │ └── web_html.py │ ├── __init__.py │ ├── libs # 工具函数 │ │ ├── commons.py │ │ └── const.py │ └── static # 静态资源 │ ├── html │ │ ├──

Create subclass from superclass static main

由 狂风中的少年 提交于 2020-01-03 19:05:14
问题 I have a generic, abstract class ( SuperClass ). I want to have there a main method, that would be a default main for each subclass and would do the same, but with proper subclass object that derived and called it. Like this: public abstract class SuperClass { // some code here... public static void main(String args[]) { // here instantiate the subclass // extending this SuperClass, and call // some methods } } public SubClass extends SuperClass { // here just implement some // abstract

Create subclass from superclass static main

由 江枫思渺然 提交于 2020-01-03 19:04:34
问题 I have a generic, abstract class ( SuperClass ). I want to have there a main method, that would be a default main for each subclass and would do the same, but with proper subclass object that derived and called it. Like this: public abstract class SuperClass { // some code here... public static void main(String args[]) { // here instantiate the subclass // extending this SuperClass, and call // some methods } } public SubClass extends SuperClass { // here just implement some // abstract

Generic classes and static fields

由 血红的双手。 提交于 2020-01-03 17:16:14
问题 Is there a way to share one static variable between several different generic classes ? I have a class class ClassA <T> : ObservableCollection<T> { static int counter; //... } and a couple of instances of it with different parameter instantiations, like ClassA<int> a = new ClassA<int>(); ClassA<double> b = new ClassA<double>(); ClassA<float> c = new ClassA<float>(); Is there a way that the instances a, b, and c share the static field counter ? Any answers and comments are pretty much
订阅 static