FAQ

• General
  • Why are all versions of Logtalk numbered 2.x or 3.x?
  • Why do I need a Prolog compiler to use Logtalk?
  • Is the Logtalk implementation based on Prolog modules?
  • Does the Logtalk implementation use term-expansion?
• Compatibility
  • What are the backend Prolog compiler requirements to run Logtalk?
  • Can I use constraint-based packages with Logtalk?
  • Can I use Logtalk objects and Prolog modules at the same time?
• Installation
  • The integration scripts/shortcuts are not working!
  • I get errors when starting up Logtalk after upgrading to the latest version!
• Portability
  • Are my Logtalk applications portable across Prolog compilers?
  • Are my Logtalk applications portable across operating systems?
• Programming
  • Should I use prototypes or classes in my application?
  • Can I use both classes and prototypes in the same application?
  • Can I mix classes and prototypes in the same hierarchy?
  • Can I use a protocol or a category with both prototypes and classes?
  • What support is provided in Logtalk for defining and using components?
  • What support is provided in Logtalk for reflective programming?
• Troubleshooting
  • Using compiler options on calls to the Logtalk compiling and loading predicates does not work!
  • Gecko-based browsers (e.g., Firefox) show non-rendered HTML entities when browsing XML documenting files!
  • Compiling a source file results in errors or warnings but the Logtalk compiler reports a successful compilation with zero errors and zero warnings!
• Usability
  • Is there a shortcut for compiling and loading source files?
  • Is there an equivalent directive to the ensure_loaded/1 Prolog directive?
  • Are there shortcuts for the make functionality?
• Deployment
  • Can I create standalone applications with Logtalk?
• Performance
  • Is Logtalk implemented as a meta-interpreter?
  • What kind of code Logtalk generates when compiling objects? Dynamic code? Static code?
  • How about message-sending performance? Does Logtalk use static binding or dynamic binding?
  • Which Prolog-dependent factors are most crucial for good Logtalk performance?
  • How does Logtalk performance compare with plain Prolog and with Prolog modules?
• Licensing
  • What’s the Logtalk distribution license?
  • Can Logtalk be used in commercial applications?
  • What’s the final license for a combination of Logtalk with a Prolog compiler?
• Support
  • Are there professional consulting, training and supporting services?