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The syntax used for Qt's signals and slots has proved very successful in practice. Or the vast variety of scanner and parser generators, with lex and yacc being the most well-known ones. We use it to safely query interfaces from dynamically loaded components. The property system alone is a great advantage: a powerful and generic user interface design tool like Qt Designer would be a lot harder to write - if not impossible - without a powerful and introspective property system. Documentation contributions included herein are the copyrights of their respective owners. Qt and respective logos are trademarks of The Qt Company Ltd. But if you need to send out every single byte one by one to a consumer, use a listener interface rather than signals and slots. Our approach goes far beyond anything you can do with templates. And then there is a gray area in between. With moc , we have turned this disadvantage into an advantage, and added the flexibility required to meet the challenge of safe and efficient graphical user interface programming. A generic vector container class is easily expressible, even with partial specialisation for pointer types, while a function that sets up a graphical user interface based on an XML description given as a string is not expressible as a template. While it is true that Qt adds a small overhead to the cost of calling a slot through a signal, the cost of the call is only a small proportion of the entire cost of a slot. Qt's moc Meta Object Compiler provides a clean way to go beyond the compiled language's facilities. This is not surprising since the Qt mechanism includes a generic marshaller, introspection, queued calls between different threads, and ultimately scriptability. They take a grammar specification as input and generate code that implements a state machine. We can e. This helps programmers get their design right from the very beginning, without even having to think about design patterns. What's good for a high end database server or an operating system isn't necessarily the right design choice for a GUI frontend. People learning Qt find the syntax helps them understand and utilize the signals and slots concept -- despite its highly abstract and generic nature. Another application domain are dynamic meta objects. Or we can export Qt components as ActiveX components by exporting its meta object. The moc is not the only code generator Qt is using. In cases where this occurs, you probably only require a connection anyway. Aside: If you have a signals and slots connection in a tight inner loop of a performance critical task and you identify this connection as the bottleneck, think about using the standard listener-interface pattern rather than signals and slots. Benchmarking against Qt's signals and slots system is typically done with empty slots. We can establish connections using type-safe call-by-name, without having to know the exact types of the objects we are connecting. As soon as you do anything useful in your slots, for example a few simple string operations, the calling overhead becomes negligible. For example, we can have object properties. You cannot do either of these things with templates. But it does not end here. Calling Performance is Not Everything Qt's signals and slots implementation is not as fast as a template-based solution. But just because those things can be done, it does not necessarily mean doing them is the right design choice. Code, unfortunately, is not meant to be published in books, but compiled with real-world compilers on real-world operating systems. Here are some reasons why Qt uses the moc: Syntax Matters Syntax isn't just sugar: the syntax we use to express our algorithms can significantly affect the readability and maintainability of our code. Both templates and the C preprocessor can be stretched to do incredibility smart and mind boggling things. Another benefit is that we can explore an object's signals and slots at runtime. For all these advantages, there are some downsides. It is what makes Qt the flexible and comfortable tool we have today. Our signals add zero bytes to the size of a class instance, which means we can add new signals without breaking binary compatibility. And we can have overloaded signals and slots, which feels natural when programming in a language where overloads are a key concept. Things that you can hack with templates at the cost of code size, readability, portability, usability, extensability, robustness and ultimately design beauty. Another prominent example is the uic User Interface Compiler. The syntax is intuitive, simple to use and easy to read.

As such, templates are highly interesting to framework creators, and we do use advanced templates in many places in Qt. Among these are scoped translations via a generated tr function, and an advanced property system with introspection and extended runtime type information.

Because qt signal/slot performance had the moc for signals and slots, we could add other useful things to it that could not qt signal/slot performance done with templates. Outside Qt, code generators are common as well.

No Limits Because we had the moc for signals and slots, we could add other useful things to it that could not be done with templates.

The alternatives to code generators are hacked compilers, proprietary languages or graphical programming tools with one-way dialogs or wizards that generate obscure code during design time rather than compile time. Syntax isn't just sugar: the syntax we use to express our algorithms can significantly affect the readability and maintainability of our code. While emitting a signal is approximately the cost of four ordinary function calls with common template implementations, Qt requires effort comparable to about ten function calls. Qt's signals and slots implementation is not as fast as a template-based solution. This is impossible with a template based solution. Instead of forcing programmers to add generated code into source repositories, we encourage them to add our tools to their build system: cleaner, safer and more in the spirit of UNIX. Even during the process of emitting a signal to several receivers, those receivers can be deleted safely without your program crashing. Typically moc is not called manually, but automatically by the build system, so it requires no additional effort by the programmer. All other trademarks are property of their respective owners. Qt's iterators are safe while those of faster template-based systems are not. It's the only language that is exploited on such a wide range of software projects, spanning every kind of application from entire operating systems, database servers and high end graphics applications to common desktop applications. Take for example rpc and idl , that enable programs or objects to communicate over process or machine boundaries. Without this safety, your application would eventually crash with a difficult to debug free'd memory read or write error. It does not rely on excessive inlining and code expansion and it provides unmatched runtime safety. Code Generators are Good Qt's moc Meta Object Compiler provides a clean way to go beyond the compiled language's facilities. Nonetheless, couldn't a template-based solution improve the performance of an application using signals and slots? For example, if you have an object that downloads data from the network, it's a perfectly sensible design to use a signal to indicate that the requested data arrived. However, there are limitations: There are things that you can easily express with templates, and there are things that are impossible to express with templates.