这是2013年写的一篇旧文,放在gegahost.net上面 http://raison.gegahost.net/?p=15 February 15, 2013 How `new’ operator works ? Filed under: c++ — Tags: C++ internal, c++ memory layout, c++ new, POD, virtual class — Raison @ 12:38 am (original works by Peixu Zhu) For s…

1. System.Object        The runtime requires every type to ultimately be derived from the System.Object type.        Because all types are ultimately derived from System.Object, you are guaranteed that every object of every type has a minimum set of…

All transformations in Flink may look like functions (in the functional processing terminology), but are in fact stateful operators. You can make every transformation (map, filter, etc) stateful by using Flink's state interface or checkpointing insta…

Dictionaries A dictionary is like a list, but more general. In a list, the indices have to be integers; in a dictionary they can be (almost) any type.You can think of a dictionary as a mapping between a set of indices (which are called keys) and a se…

MDX : Non Empty v/s NonEmpty User Rating: / 50 PoorBest Written by Jason Thomas    Friday, 07 May 2010 00:44 Reposted from Jason Thomas blog with the author's permission. The last few months, recession worries have allayed and it is common to see the…

One of my favourite questions in MDX is the difference between Non Empty and NonEmpty because even though many people use them daily to remove NULLS from their queries, very few understand the working behind it. Many times, I have even got answers li…

JsonPath is to JSON what XPATH is to XML, a simple way to extract parts of a given document. JsonPath is available in many programming languages such as Javascript, Python and PHP. Now also in Java! News   2013-09-27 Released 0.9.0 bug fixes, general…

  Introduction: Before the possibilities of the new C++ language standard, C++11, the use of templates was quite limited when it came to implementing for instance function objects (functors) & tuple facilities. Implementing these sort of things using…

  Examining ADF Business Components New Features Purpose In this tutorial, you create a series of simple ADF business services scenarios in JDeveloper 11g. This is intended as a light introduction to some of the new ADF BC functionality in Release 11…

学习Dart语言,必须将以下的概念熟记于心: 在dart语言中,一切皆为对象.所有的对象都是一个类的实例.甚至整数.函数.null也看做是对象.所有的对象都继承于Object类 尽管Dart是强类型语言,但是变量的类型指定不一定要标明,因为Dart可以推断出它的类型.比如说变量number就可以被推测出是int类型.如果你想明确表示这个变量不想被任何一个类型指定,那就使用特殊类型dynamic来表示. Dart语言支持通用类型,比如List<int>表示整数集列表,List<dynami…

When action grows unprofitable, gather information; when information grows unprofitable, sleep.                                      Ursula K. Le Guin, The Left Hand of Darkness 索引 作者的几个观点 ECMAScript standard Values, Types, and Operators Web browsers…

# JSONPath - XPath for JSON A frequently emphasized advantage of XML is the availability of plenty tools to analyse, transform and selectively extract data out of XML documents. XPath is one of these powerful tools. It's time to wonder, if there is a…

vim vimtutor ================================================================================ W e l c o m e t o t h e V I M T u t o r - Version 1.7 =欢迎使用VIM教程 1.7版=============================================================================== Vim is…

一.简介 世界上只有三种编辑器,EMACS.VIM和其它. 我们所处的时代是非常幸运的,有越来越多的编辑器,相对于古老的VIM和EMACS,它们被称为现代编辑器.我们来看看这两个古董有多大年纪了: **EMACS** : ~ = 38岁 **VI** : ~ = 37岁 **VIM** : ~ = 22岁 简单列举一下程序员期望使用的编辑拥有的功能: 轻量级,迅速启动(相对于IDE) 语法高亮 自动对齐 代码折叠 自动补全 显示行号 重定义Tab 十六进制编辑 列编辑模式 快速注释 高级搜索,替…

此页面向您展示如何使用每个主要Dart功能,从变量和运算符到类和库,假设您已经知道如何使用其他语言编程. 要了解有关Dart核心库的更多信息,请参阅 Dart Libraries之旅.无论何时需要有关语言功能的更多详细信息,请参阅Dart语言规范. 提示: 您可以使用DartPad播放Dart的大部分语言功能(了解更多信息). 打开DartPad 一个基本的Dart项目 以下代码使用了Dart的许多基本功能: // Define a function. printInteger(int aNum…

初次翻译,部分内容并非按字面翻译,是按本人理解进行了内容重组.如有错误望指正. Dart语言内置如下数据类型: numbers strings booleans lists (所谓的数组) maps runes (for expressing Unicode characters in a string) symbols 你可以通过直接赋值指定变量为如上几个基本数据类型,比如,'this is a string'就是String类型的值,true就是boolean类型的值. Numbers Da…

What is it? Here’s the scenario Consider getting the grandchild of a parent object like this: var g1 = parent.child.child.child; 很明显parent类里面有一个child类的成员,child类又包含child类的成员,这是一个递归调用,child.child.child....可以延伸到无限级. Okay, so, this is some poor coding be…

https://stackoverflow.com/questions/2802055/what-does-the-construct-x-x-y-mean -------------------------------------------------------- What is the double pipe operator (||)? The double pipe operator (||) is the logical OR operator . In most language…

实现效果: 主页代码: <script type="text/javascript" src="jquery.min.js"></script> <script type="text/javascript" src="jquery.date_input.js"></script> <link rel="stylesheet" href="dat…

Dart基础学习02--变量及内置类型 Dart中的变量 首先看一个变量的定义和赋值 var name = 'Bob'; 在Dart中变量名都是引用,这里的name就是一个指向值为Bob的字符串的引用. 默认值 在Dart中没有初始化的变量都有一个默认值null,哪怕是int型的变量它的初始值也是null,因为在Dart中int也是一个对象. int lineCount; assert(lineCount == null); 注意:这里引入一个Dart的重点知识,在Dart中任何可以放入变量中的…

Exception Try { ... ... } catch (Exception ex) { …; throw new Throwable(ex); } catch (Throwable ex) { …; } finally { } /* * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distr…

转载来源:http://www.ssas-info.com/analysis-services-articles/50-mdx/2196-mdx-non-empty-vs-nonempty One of my favourite questions in MDX is the difference between Non Empty and NonEmpty because even though many people use them daily to remove NULLS from t…

http://goessner.net/articles/JsonPath/ [edit] [comment] [remove] |2007-02-21| e1 # JSONPath - XPath for JSON A frequently emphasized advantage of XML is the availability of plenty tools to analyse, transform and selectively extract data out of XML do…

A dictionary is like a list, but more general. In a list, the indices have to be integers; in a dictionary they can be (almost) any type. You can think of a dictionary as a mapping between a set of indices and a set of values. Each index, which is ca…

1. Modulus operator (%) The modulus operator works on integers and yields the remainder when the first operand is divided by the second. In Python, the modulus operator is a percent sign (%). The syntax is the same as for the other operators: The mod…

Code Like a Pythonista: Idiomatic Python David Goodger goodger@python.org http://python.net/~goodger In this interactive tutorial, we'll cover many essential Python idioms and techniques in depth, adding immediately useful tools to your belt. There a…

除了CROSS JOIN, INNER JOIN, OUTER JOIN之外,T-SQL还提供了CROSS APPLY和OUTER APPLY这两个较为另类的Set操作符. 首先来看CROSS APPLY.跟CROSS JOIN一样,MSDN只在FROM Clause的文档中做了一个介绍,如下: Both the left and right operands of the APPLY operator are table expressions. The main difference bet…

About this Course This course will teach you how to build convolutional neural networks and apply it to image data. Thanks to deep learning, computer vision is working far better than just two years ago, and this is enabling numerous exciting applica…

mvel受到了java语法的启发,但是存在一些根本性的差异,mvel旨在使其成为更有效的表达式语言.比如直接支持集合.数组和字符串匹配,正则表达式的运算操作等. mvel2.x有以下几个部分组成:  Property expressions Boolean expressions Method invocations Variable assignments Function definitions 目录:      1:基本语法      2:操作运算      3:值测试      4:内联…

一.# rpm -qa|grep vim vim-minimal-7.2.-1.8.el6.x86_64 vim-enhanced-7.2.-1.8.el6.x86_64 vim-common-7.2.-1.8.el6.x86_64 # rpm -e vim-minimal-7.2.-1.8.el6.x86_64 vim-enhanced-7.2.-1.8.el6.x86_64 vim-common-7.2.-1.8.el6.x86_64 --nodeps 二. # wget ftp://ftp…