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As of Visual Studio 2005, IntelliSense is now activated by default when the user begins to type, instead of requiring marker characters (though this behavior can be turned off). IntelliSense is now supported by the Visual Studio editors for C++, C#, J#, Visual Basic, XML, HTML and XSLT among others. IntelliSense has entered a new phase of development with the unified Visual Studio.NET environment first released in 2001, augmented by the more powerful introspection and code documentation capabilities provided by the.

For example, one of the most requested capabilities missing from the pre-.NET products was support for templates, which is now fully implemented.

These shortcomings (criticized by many VC++ developers since the 97 release) have been largely corrected in the. Because it was based on the introspection capabilities of COM, the Visual Basic versions of IntelliSense were always more robust and complete than the 5.0 and 6.0 (97 and 98 in the Visual Studio naming sequence) versions of Visual C++, which did not have the benefit of being entirely based on COM. Initially, Visual Basic IDE was the primary "test bed" for the technology, but IntelliSense was incorporated into Visual FoxPro and Visual C++ in the Visual Studio 97 timeframe (one revision after first seen in Visual Basic). It was first introduced as a feature of a mainstream Microsoft product in 1996 building on many already invented concepts of code completion and syntax checking, with the Visual Basic 5.0 Control Creation Edition, which was essentially a publicly available prototype for Visual Basic 5.0. IntelliSense is Microsoft's implementation of code completion, best known in Visual Studio. Support in editors and IDEs Visual Studio SPELL and its algorithms and data structures inspired the Unix program Ispell. Gorin made SPELL publicly accessible, as was done with most SAIL programs, and it soon spread around the world via the then-new ARPANET, about a decade before personal computers came into general use. Gorin wrote the program in assembly for faster action he made it by searching a word list for plausible correct spellings that differ by a single letter or adjacent-letter transpositions, and presenting them to the user. SPELL, for the DEC PDP-10 at Stanford University's Artificial Intelligence Laboratory (SAIL), was published in February 1971. Ralph Gorin, a graduate student under Earnest at the time, created the first true spell-check program written as an application (rather than research) for general English text. In 1961, Les Earnest, who headed the research on this budding technology, saw it necessary to include the first spell checker that accessed a list of 10,000 acceptable words. Research on intelligent code completion began in 1957, with spelling checkers for bitmap images of cursive writing and special applications to find records in databases despite incorrect entries.
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Some code editing software provide intelligent code completion through a Language Server Protocol (LSP) server. The feature also lets users select from a number of overloaded functions in languages that support object-oriented programming. IntelliSense also displays a short description of a function in the pop-up window-depending on the amount of documentation in the function's source code. Over time, IntelliSense determines which variable or function the user most likely needs. The user can either accept the suggestion by typing a statement-completion character ( Tab ↹ or ↵ Enter) or a language-specific marker (such as the semicolon for C++), or continue typing the name. When the user types one of these characters immediately after the name of an entity having one or more accessible members (such as contained variables or functions), IntelliSense suggests matches in a pop-up dialog. The "classic" implementation of IntelliSense works by detecting marker characters such as periods (or other separator characters, depending on the language). Intelligent code completion uses an automatically generated in-memory database of classes, variable names, and other constructs that given computer code defines or references. variables and functions) in the active scope appears dynamically in the form of tooltips. It also allows for users to refer less frequently to external documentation, as interactive documentation on many symbols (i.e. The feature speeds up software development by reducing keyboard input and the necessity for name memorization. Intelligent code completion, which is similar to other autocompletion systems, is a convenient way to access descriptions of functions-and in particular their parameter lists.
