Introduction

Authentication and authorization as fundamental part of a web application was tremendously simplified with arrival of .NET 2.0. Basic authentication and authorization can be performed using different DBMS systems. There are numerous examples implementing authentication using Access database. One such example can be found in the article ASP.NET 2.0 Authentication using Access Database. In this article the example implements bare minimum to achieve desired goal, namely authentication and authorization using access database. However, authentication and authorization is only first part of the user management system. Second fundamental part of user management is allowing users to create an account at will. In such instances, users can sign up and become members of the community without administrator intervention. Furthermore, the user should be able to provide contact information (email) so that he/she can be contacted if necessary. Contact information must be verified. This article focuses on very simple ways to achieve such goal.
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Couple of days ago, I worked on an MFC application that required special functionallity of F1 key. At first, I thought that all I need is to override application's PreTranslateMessage function and trap the F1 key. However, I was wrong. Every time I pressed F1 key, the application performed custom function, but also popped message box saying that help file could not be located. My first thought was that MFC/Windows is placing a windows hook to trap such functionality and that the workaround might not be very elegant. Fortunatly that was not the case. After some investigation, I noticed the following code:

BEGIN_MESSAGE_MAP(CDRSApp, CWinApp)
    ON_COMMAND(ID_HELP, &CWinApp::OnHelp)
END_MESSAGE_MAP()

In other words, main application is getting notification to handle help request and is passing it to default MFC implementation. Once the ON_COMMAND line is commented out, such hadling is disabled.

Abstract

The compiler design is a well researched area of computer science. Typically, compiler designers use a parser generator framework like YACC or PCCTS to construct lexer, scanner, parser, and abstract syntax tree. With the arrival of expression templates and template meta-programming, it is possible to construct a parser by simply using the template meta-programming technique. The Spirit library is object-oriented recursive-decent parser implemented in C++ using expression templates and meta-programming. In Spirit the parser is constructed during the compile time using a combination of primitive parsers and fusing them through template meta-programming. TinyPascal is a practical application of Spirit framework.
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