class

push_back with derived class

由 荒凉一梦 提交于 2020-02-04 04:05:08
问题 I want to create an array of objects and I want to use a certain constructor. std::vector<Modul> arrDigOut; arrDigOut.push_back(Modul(IDC_CHECK1, this, "GVL.DigOut1", pAddr)); This works as long as DigOut is not a derived class. When I derive it and use the class DigOut it fails: class Modul { protected: int id; int nErr; void* plcVar; bool bDigOut; PAmsAddr pAddr; ULONG lHdlVar; CButton* pBt; public: Modul(); //Modul(int ID, Cbeckhoff_frontendDlg* pCbeckhoff,void* pVar,PAmsAddr pAdr) //{ //

Class works not correct. How to make it better?

由 China☆狼群 提交于 2020-02-04 02:50:07
问题 I have written class and want show it to you ... I think that this class written not correct and thats why I have leeks in my application. First of all the delloc never calls. What can I change in this class to make it better, please help. Articles.h #import <Foundation/Foundation.h> @interface Article : NSObject { BOOL favorite; NSMutableString * title; NSMutableString * summary; NSMutableString * mainLink; NSMutableString * pubDate; NSMutableString * author; NSMutableString * imageLink; }

ios - objectC 的isa 详解

由 六月ゝ 毕业季﹏ 提交于 2020-02-04 00:25:59
每个Objective-C对象都有一个隐藏的数据结构，这个数据结构是Objective-C对象的第一个成员变量，它就是isa指针。 在NSObject.h里面： @interface NSObject < NSObject > { Class isa OBJC_ISA_AVAILABILITY ; } 再点开 Class 的定义： struct objc_class { Class isa OBJC_ISA_AVAILABILITY; #if !__OBJC2__ Class super_class OBJC2_UNAVAILABLE; const char *name OBJC2_UNAVAILABLE; long version OBJC2_UNAVAILABLE; long info OBJC2_UNAVAILABLE; long instance_size OBJC2_UNAVAILABLE; struct objc_ivar_list *ivars OBJC2_UNAVAILABLE; struct objc_method_list **methodLists OBJC2_UNAVAILABLE; struct objc_cache *cache OBJC2_UNAVAILABLE; struct objc_protocol_list *protocols OBJC2

How can get an instance from .class file in java

由 痴心易碎 提交于 2020-02-03 12:23:13
问题 Frankly, I do not know even it is possible or not. But what I am trying to do is just like below. I made a class file from ClassFile.java via javac command in terminal. Then I want to get an instance from .java file or .class file. Next, I made another project in eclipse, As you guess this project path and upper file path are completely different. For instance, ClassFile.java/class file can be located in '~/Downloads' folder, the other hand, new eclipse project can be in '~/workspace/'. So I

深入理解JVM张龙-P15-P20

由 此生再无相见时 提交于 2020-02-03 12:07:29
数组类的Class对象不是由classloader创建的，是由Java虚拟机在动态运行期间创建的 来自定义类加载器 loadclass方法会调用我们重写的findclass方法。findclass方法一定要重写 package com . kmoonwang . mywenda ; import java . io . ByteArrayOutputStream ; import java . io . File ; import java . io . FileInputStream ; import java . io . InputStream ; import java . util . Random ; import java . util . UUID ; public class JVMlearning extends ClassLoader { private String classLoaderName ; private final String fileExtension = ".class" ; private String path ; //指定从什么地方去加载 public void setPath ( String path ) { this . path = path ; } public JVMlearning ( String

Python全栈（四）高级编程技巧之4.元类编程、迭代器和生成器

由 ◇◆丶佛笑我妖孽 提交于 2020-02-03 05:44:37
文章目录 一、__getattr__和__getattribute__魔法函数 二、属性描述符 1.属性描述符分析 2.属性查找顺序 三、自定义元类 1.动态创建类 2.使用type创建类 四、metaclass属性 五、迭代器和生成器 1.迭代器 2.生成器 应用：生成器读取大文件 一、__getattr__和__getattribute__魔法函数 from datetime import date class User : def __init__ ( self , name , birthday ) : self . name = name self . birthday = birthday if __name__ == "__main__" : user = User ( "corley" , date ( year = 2020 , month = 1 , day = 1 ) ) print ( user . name ) 打印 corley 当打印不存在的属性时，会报错： from datetime import date class User : def __init__ ( self , name , birthday ) : self . name = name self . birthday = birthday if __name__ == "__main

Add to custom class in Python

由 六眼飞鱼酱① 提交于 2020-02-03 04:49:27
问题 I would like to be able to add to a custom class in the style of: x=myclass("Something", 7) x + 3 7, of course, corresponds with an inner property that I'd like to increment by adding to it. The class holds a number that refers to a location in a list. This might seem like something that can be done by a normal integer, but I need it to act as a separate type. This is all done to emulate an old game language. The class is its 'variable' class, and the value of the variable is stored in the

css--layui树练习

由 跟風遠走 提交于 2020-02-03 00:08:50
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>老师端</title> <script src="js/jquery-1.11.1.js"></script> <script src="js/jquery-1.9.1.min.js"></script> <link rel="stylesheet" href="dtree2/layui/css/layui.css"> </head> <body class="layui-layout-body"> <div class="layui-layout layui-layout-admin"> <!--1.头部区域--> <div class="layui-header"> <div class="layui-logo">后台管理</div> <!-- 头部区域（可配合layui已有的水平导航） --> <ul class="layui-nav layui-layout-left"> </ul> <ul class="layui-nav layui-layout-right"> <li class

大数据wordcount代码。要理解代码就要配合图形理解

由 ＊爱你＆永不变心＊ 提交于 2020-02-02 23:28:36
package cn.itcast.hadoop.mr; import java.io.IOException; import org.apache.hadoop.conf.Configuration; import org.apache.hadoop.fs.Path; import org.apache.hadoop.io.IntWritable; import org.apache.hadoop.io.Text; import org.apache.hadoop.mapreduce.Job; import org.apache.hadoop.mapreduce.lib.input.FileInputFormat; import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat; public class WordCountDriver { public WordCountDriver() { } public static void main(String[] args) throws IOException, ClassNotFoundException, InterruptedException { Configuration conf = new Configuration(); //conf.set(

从EnableJpaRepositories说开去

由 泪湿孤枕 提交于 2020-02-02 20:01:09
1 、spring boot @EnableJpaRepositories( repositoryBaseClass = BaseRepositoryImpl.class, includeFilters = @ComponentScan.Filter(type = FilterType.ASSIGNABLE_TYPE, classes = BaseRepository.class), excludeFilters = @ComponentScan.Filter(NoRepositoryBean.class), repositoryFactoryBeanClass = BaseRepositoryFactoryBean.class ) 从EnableJpaRepositories的源代码里面可以看到相关的默认值 1 @EnableJpaRepositories( 2 basePackages = {}, 3 basePackageClasses = {}, 4 includeFilters = {}, 5 excludeFilters = {}, 6 repositoryImplementationPostfix = "Impl", 7 namedQueriesLocation = "",//META-INF/jpa-named-queries.properties 8
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