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Joel Bennett

The Performance of Arrays - Chris Burrows - 2 views

  • arrays of reference types are covariant in their element type, but not safely
  • where did that exception come from? It came from the runtime, which was in a unique position to know what the real type of the array object was, and the real type of the element. It needed to determine if the assignment was allowable and throw if not. Now if you think about this for a minute, you can see that it’s going to have to perform that check for every assignment to an array element
  • arrays are covariant only for reference types?
  • ...3 more annotations...
  • So if I want to have an array of reference types, but get the runtime to treat it like an array of value types, what have I got to do? Just wrap the reference type in a value type
  • So I got rid of that check, right? But I added the initialization of a value type. Did I win or lose? Let’s do some timing to figure it out.
  • when I build Debug binaries, the Reference<T> trick makes my example about three times SLOWER.
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    Arrays are covariant only for reference types. If you use a struct wrapper to turn a reference type into a value type, the initialization of the value type takes less time than array assignment.
Fabien Cadet

Intel® 64 and IA-32 Architectures Software Developer's Manuals - 0 views

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    Software Developer's Manuals: * Volume 1: Basic Architecture. * Volume 2A&B: Instruction Set Reference. * Volume 3A&B: System Programming Guide. * Optimization Reference Manual. * Memory Ordering White Paper. * Application Note: TLBs, Paging-Structure Caches, and Their Invalidation. * x2APIC Specification.
Fabien Cadet

SitePoint HTML / CSS / Javascript Reference - 0 views

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    Companion site for the "Ultimate CSS/HTML Reference" books. Comprehensive documentation.
Adildi ldinlio

Adobe Creative Suite 3 Web Premium All-in-One Desk Reference For Dummies|free ebooks do... - 0 views

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    Adobe Creative Suite 3 Web Premium All-in-One Desk Reference For Dummies free download at the best library for free multimedia ebooks download.
Matti Narkia

Download - Ubuntu Pocket Guide and Reference - 0 views

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    The PDF Edition of Ubuntu Pocket Guide and Reference is available entirely free of charge. It is practically identical to the Print Edition. You can download it by clicking the links below. Over 250,000 people already have!
Matteo Spreafico

Fabulous Adventures In Coding : The Stack Is An Implementation Detail, Part One - 0 views

  • Almost every article I see that describes the difference between value types and reference types explains in (frequently incorrect) detail about what “the stack” is and how the major difference between value types and reference types is that value types go on the stack.
  • I find this characterization of a value type based on its implementation details rather than its observable characteristics to be both confusing and unfortunate. Surely the most relevant fact about value types is not the implementation detail of how they are allocated, but rather the by-design semantic meaning of “value type”, namely that they are always copied “by value”.
  • Of course, the simplistic statement I described is not even true. As the MSDN documentation correctly notes, value types are allocated on the stack sometimes. For example, the memory for an integer field in a class type is part of the class instance’s memory, which is allocated on the heap.
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  • As long as the implementation maintains the semantics guaranteed by the specification, it can choose any strategy it likes for generating efficient code
  • That Windows typically does so, and that this one-meg array is an efficient place to store small amounts of short-lived data is great, but it’s not a requirement that an operating system provide such a structure, or that the jitter use it. The jitter could choose to put every local “on the heap” and live with the performance cost of doing so, as long as the value type semantics were maintained
  • I would only be making that choice if profiling data showed that there was a large, real-world-customer-impacting performance problem directly mitigated by using value types. Absent such data, I’d always make the choice of value type vs reference type based on whether the type is semantically representing a value or semantically a reference to something.
amby kdp

Download Here Best Python Programming Book For Beginners - 0 views

shared by amby kdp on 16 Mar 15 - No Cached
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    "Python Programming For Beginners" by James P. Long Book is the must have book for all those programmers who wish to keep some reference while programming. It is not just meant for the beginners, but also the most experienced programmers can need it as a reference material. http://amzn.to/1GL50ff
trimantra

How to run .NET 2/3.5 website/webapplication into .NET 4 hosting environment | Trimantr... - 0 views

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    It is general requirement that you want to host your ASP.NET 2.0/3.5 website/webapplication onto the hosting server which provide support for .NET Framework 4 but not for .NET Framework 2. At the time of development we normally assume that by default all application should run on .NET Framework 4 because backward compatibility is supported. But sometimes they are not because of new changes into ASP.NET 4.0. Here is the link for your reference: ASP.NET 4 Breaking Changes.
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    It is general requirement that you want to host your ASP.NET 2.0/3.5 website/webapplication onto the hosting server which provide support for .NET Framework 4 but not for .NET Framework 2. At the time of development we normally assume that by default all application should run on .NET Framework 4 because backward compatibility is supported. But sometimes they are not because of new changes into ASP.NET 4.0. Here is the link for your reference: ASP.NET 4 Breaking Changes.
Joel Bennett

CSS Cheat Sheet - Cheat Sheets - ILoveJackDaniels.com - 0 views

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    A CSS 2.1 cheat sheet, listing all selectors and properties, plus a visual reference of the box model, as well as references for CSS units, media types, etc.
Daniel Gregoire

Mastering the VI editor - 0 views

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    Good reference for vi editor.
Fabien Cadet

utf 8 nbsp - RE: nbsp is not that hard, folks ; reply by: Américo Albuquerque... - 0 views

  • " " " " and "\u00A0" have nothing, NOTHING to do with UTF-8.
  • There is a character -- an abstract unit in a "script" (a writing system; we are using Latin right now) -- called NO-BREAK SPACE by the Unicode Standard and ISO/IEC 10646. Unicode and ISO/IEC 10646 assign this character an integer number, 160, which is A0 in hex.
  • UTF-8 is an encoding scheme that provides a way of representing any of the approximately 1.1 million possible abstract characters in Unicode as a sequence of 1 to 4 bytes.
  • ...8 more annotations...
  • The UTF-8 representation of the Unicode character 160 (no-break space), is the pair of bytes C2 A0, in that order.
  • This thing: \u00A0
  • the no-break space character
  • This thing:   or this thing:  
  • is to SGML applications like HTML and XML what \u00A0 is to Java & Python;
  • is called a character reference (or "numeric character reference").
  • This thing:  
  • is to SGML applications like HTML and XML an "entity reference";
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    « [...] " " " " and "\u00A0" have nothing, NOTHING to do with UTF-8 [...] Unicode and ISO/IEC 10646 assign this character an integer number, 160, which is A0 in hex [...] UTF-8 is an encoding scheme [...] The UTF-8 representation of the Unicode character 160 (no-break space), is the pair of bytes C2 A0. »
iwebservices7

What Is the Future of Cross-Platform App Development? - 0 views

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    Cross-platform apps have emerged as one of the most popular choices in the world of mobile app development due to the advantages they provide. In the technology-driven world today, there is a strong demand for apps without bugs. Quite naturally, businesses put in their best efforts to satisfy the customers with powerful apps without glitches. With enhanced user experience, businesses can get the opportunity of increasing revenue. Before you move ahead to the future of cross-platform apps, it is essential to understand what they mean for businesses. Cross-platform app development refers to the creation and delivery of mobile apps that can function effortlessly on different platforms, such as iOS and Android. It requires a single codebase to develop cross-platform apps. Among the popularly-known cross-platform apps, Flutter and React Native from Facebook are common among the app developers.
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    Cross-platform apps have emerged as one of the most popular choices in the world of mobile app development due to the advantages they provide. In the technology-driven world today, there is a strong demand for apps without bugs. Quite naturally, businesses put in their best efforts to satisfy the customers with powerful apps without glitches. With enhanced user experience, businesses can get the opportunity of increasing revenue. Before you move ahead to the future of cross-platform apps, it is essential to understand what they mean for businesses. Cross-platform app development refers to the creation and delivery of mobile apps that can function effortlessly on different platforms, such as iOS and Android. It requires a single codebase to develop cross-platform apps. Among the popularly-known cross-platform apps, Flutter and React Native from Facebook are common among the app developers.
lucyll

How to Watch 4K Videos on 4K Blu ray Player? - YouTube - 0 views

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    Ultra HD, commonly referred to as 4K, has four times the amount of pixels of standard HD. It has twice the horizontal pixels and twice the amount of vertical pixels, resulting in a 3840 x 2160 resolution that makes 4K one of the sharpest formats on the market.There are many ways to watch 4K video, the most popular way is to watch 4k videos by 4K Blu-ray Player. Sometimes,when you play your 4K video on 4K Blu-ray Player,you will find your 4K video can' t be supported by the 4K Blu-ray player. Then how to solve the problem? Just watch this tutorial.
Adam Wills

HTML5 Aside Tag Using Tutorial to Reference Auxiliary Content - 0 views

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    To mark some additional information, HTML has recently introduced a new element that allows users to enhance an article; however it is not necessarily key to understand it. The new HTML element Aside () represents a section of a page that contains not only the main content of the page, but also some content that indirectly connected with the main content.
Biztech Consultancy

Some Steps of Convert HTML to WordPress - 0 views

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    Static Web Site and .html web page on the site and we want to move it to WordPress. Less the number of static pages, less the effort is required to convert. WordPress websites are referred as dynamic and the pages have different ending like .PHP .WordPress. It just takes couple of hours when it comes to changing website content and working with a blog.
Charlie Collett

New Stocks S6400 Heavy Duty Truck-mounted Street Sweeper - 0 views

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    Sweepers Australia street sweeper or street cleaner may refer to either a person's occupation, or a machine that cleans streets.
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