wrapper | 易学教程

Wrappers in switch statement

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问题 I have a question about objects in a switch statement. I am aware that variables used in case clause must be final (otherwise we get: "case expressions must be constant expressions"). Final on objects means only reference can't be changed, the value still can be changed by other non final reference therefore, we cant use objects in 'case'. But why cant we use wrappers? They are immutable arent they? java code: Integer i = 8; final int x = 10; switch ( x ) { case x: System.out.println("x");

How do I print a Mat element using this basic C wrapper for the C++ Mat Class ptr object

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问题 I'm writing a C wrapper for some OpenCV C++ code and I have 2 functions I use to create a Mat object and set data to it cv_create_Mat_type and cv_Mat_ptr_index respectively. The functions are as they need to be, I can't change them because there part of a project I'm working on with someone. My question is how do I print the matrix that cv_Mat_ptr_index is filling up, as it fills it up inside the for loop. The return on cv_Mat_ptr_index is a uchar* I tried dereferencing it but I need to know

PowerShell Windows Forms Wrapper

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问题 In PowerShell it is quiet common to use Windows Forms to build a User Interface for small cmdlets but the syntaxis required for this are often partly redundant and quiet verbose. This leads to the question: Is there a way to minimize the code required or does there exist a Windows Forms wrapper for PowerShell to reduce the verbose and redundant syntaxis? I am not looking for the ShowUI as this solution is too heavy considering it based on Windows Presentation Foundation (see also: WPF vs

How to include c++ bindings in a rails project

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问题 I asked this question about r-trees and the answer included using a c++ library with some ruby wrappers. I've gotten the wrapper to work in a test file, but how can I include the wrapper in my rails project? 回答1: I included the folder containing the files ( RTREE in this case) in the /lib folder of my project. I then ran ruby exconf.rb from within that folder. Lastly, I included the necessary file in my project ( require RBOOST/rboost_rtree_2d_rect ). With that, I was good to go. 来源： https:/

Tomcat8源码分析-请求处理过程

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【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> 上一篇： Tomcat8源码分析-启动流程-start方法此篇主要讲Tomcat8从接收请求到处理请求的时序图画出来，并用文字描述一下主要流程时序图说明文字描述流程之前先提示如下两点： 1.Acceptor、Poller、SocketProcessor都是NioEndpoint的内部类 2.Tomcat不一定只有NioEndpoint还有Nio2Endpoint AprEndpoint，只是常规的请求和默认都使用的是http和nio，所以在时序图中就用NioEndpoint了 Acceptor负责接收发起的请求，经过NioEndpoint和Poller将socket最终包装为一个PollerEvent放入到SynchronizedQueue同步队列当中，接着继续等待新的请求到底重复前面的步骤 Poller循环判断同步队列中是否有问题处理的Event，如果有则使用WindowsSelectorImpl读取socket，将socket中的attachment添加到SocketProcessor( implements runnable)，使用线程池启动SocketProcessor SocketProcessor经过一层层调用开始Engine-Host-Context

Returning a Opencv Mat type from my Python Code

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问题 I tried to return the (c++ opencv Mat) from my opencv python code Steps i done: A. Generated .so file for my opencv C++ program by using SWIG B. Wrote a sample Opencv Python Program A.Generating .so for my opencv C++ Code: opencvtest.cpp #include <opencv2/core/core.hpp> #include <opencv2/highgui/highgui.hpp> #include <opencv2/imgproc/imgproc.hpp> #include <iostream> using namespace cv; using namespace std; int my(Mat image) { cv::Mat out; if(! image.data ) // Check for invalid input { cout <<

Easiest way to make .NET DLL visible to COM?

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问题 I have a proprietary .NET DLL which I would like to use in a COM client. Currently when I use regasm it says: warning RA0000 : No types were registered Since I don't have the source code I can't set the classes to ComVisible or whatever else is required. How can I easily make this DLL visible to COM ? 回答1: You need to write a "COM callable wrapper". Here are a few links: http://msdn.microsoft.com/en-us/library/ms973802.aspx http://msdn.microsoft.com/en-us/library/f07c8z1c.aspx http://edn

Subclass vs Wrapper - Constructor With An Additional Parameter

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问题 Which is generally considered the more preferred method when trying to add a constructor with an additional parameter? A subclass or a wrapper? That being, creating a subclass of the class and then just using that subclass' constructor? Or adding a wrapper method which will take the extra parameter and return an object with that parameter set? Thank you for your time! EDIT: I don't have access to the superclass's code. 回答1: The answer is language dependent. In C#/.NET, you would typically use

How to create a variadic (with variable length argument list) function wrapper in JavaScript

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问题 The intention is to build a wrapper to provide a consistent method of calling native functions with variable arity on various script hosts - so that the script could be executed in a browser as well as in the Windows Script Host or other script engines. I am aware of 3 methods of which each one has its own drawbacks. eval() method: function wrapper () { var str = ''; for (var i=0; i<arguments.lenght; i++) str += (str ?', ':'') + ',arguments['+i+']'; return eval('[native_function] ('+str+')');

How do I use ServiceLoader in a Netbeans Platform project to add SPIs

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问题 I'm trying to add MP3 capabilities to my Netbeans Platform project in Netbeans 8.0. I understand that this can be easily added to the javax.sound.sampled libraries using ServiceLoader and an SPI for the MP3 codecs. So I downloaded MP3 SPI and unzipped it, then in Netbeans I created a Jar wrapper module with the three jars that were in the zip file (one jar was in the root of the zip and two were under lib/ ). Then I made the modules that need the MP3 functionality depend on this wrapper