Re: [fpc-devel] circular uses clauses
On Fri, Oct 3, 2008 at 2:31 AM, Joao Morais [EMAIL PROTECTED] wrote: Because a Pascal compiler parses the interface section of an unit only once, That would make sense. And probably the reason why FPC and Delphi are such fast compilers compared to C compilers. Thanks for the info. Regards, - Graeme - ___ fpGUI - a cross-platform Free Pascal GUI toolkit http://opensoft.homeip.net/fpgui/ ___ fpc-devel maillist - fpc-devel@lists.freepascal.org http://lists.freepascal.org/mailman/listinfo/fpc-devel
Re: [fpc-devel] circular uses clauses
Op Fri, 3 Oct 2008, schreef Graeme Geldenhuys: On Fri, Oct 3, 2008 at 2:31 AM, Joao Morais [EMAIL PROTECTED] wrote: Because a Pascal compiler parses the interface section of an unit only once, That would make sense. And probably the reason why FPC and Delphi are such fast compilers compared to C compilers. Yes, the interface contains all information the compiler needs to call a procedure. Once this is known the compiler can call procedures in a unit without having compiled the implementation yet. This is why implementations can use each other (a procedure call to a not yet compiled unit is no problem), but interfaces cannot (a reference to a type in a not yet compiled interface is problematic, because it affects how procedures are called). Daniël___ fpc-devel maillist - fpc-devel@lists.freepascal.org http://lists.freepascal.org/mailman/listinfo/fpc-devel
Re: [fpc-devel] circular uses clauses
In our previous episode, Graeme Geldenhuys said: Quote from CodeGear news circular uses clauses - why can't I declare two classes in two units that refer to each other? Why doesn't forward declarations cope with this? I've got this feature in C, C++ and C# why not Delphi? That's a good question... Why can't FPC allow that either? I don't know the internals of FPC, but can't FPC simply keep a list of used units as it compiles, so it simply skips any later references. What is the technical issue? I'm just curious here. Why do I have to put my files in a directory hierarchy and central (GAC) registries in C# and Java? Why can't I just throw all in one dir and let the compiler figure it out, like in FPC ? ___ fpc-devel maillist - fpc-devel@lists.freepascal.org http://lists.freepascal.org/mailman/listinfo/fpc-devel
Re: [fpc-devel] circular uses clauses
On Fri, Oct 3, 2008 at 3:27 PM, Marco van de Voort [EMAIL PROTECTED] wrote: Why do I have to put my files in a directory hierarchy and central (GAC) registries in C# and Java? Why can't I just throw all in one dir and let the compiler figure it out, like in FPC ? I agree! The file names could contain the namespace with a dot notation. FPC rules! :-) Regards, - Graeme - ___ fpGUI - a cross-platform Free Pascal GUI toolkit http://opensoft.homeip.net/fpgui/ ___ fpc-devel maillist - fpc-devel@lists.freepascal.org http://lists.freepascal.org/mailman/listinfo/fpc-devel
[fpc-devel] circular uses clauses
Hi. Quote from CodeGear news circular uses clauses - why can't I declare two classes in two units that refer to each other? Why doesn't forward declarations cope with this? I've got this feature in C, C++ and C# why not Delphi? That's a good question... Why can't FPC allow that either? I don't know the internals of FPC, but can't FPC simply keep a list of used units as it compiles, so it simply skips any later references. What is the technical issue? I'm just curious here. Regards, - Graeme - ___ fpGUI - a cross-platform Free Pascal GUI toolkit http://opensoft.homeip.net/fpgui/ ___ fpc-devel maillist - fpc-devel@lists.freepascal.org http://lists.freepascal.org/mailman/listinfo/fpc-devel
Re: [fpc-devel] circular uses clauses
The difference between include and uses is that include just drop everything inside the file that is using it, uses is also adding namespace and you do not share the same content. The problem with circular issues, is that it really hard to debug problems, and it usually cosing more headacks then solving problems. That's at least the reason why I think the FPC team does not allow such behavior (there might be additional reasons for this). Ido On Fri, Oct 3, 2008 at 12:52 AM, Graeme Geldenhuys [EMAIL PROTECTED] wrote: Hi. Quote from CodeGear news circular uses clauses - why can't I declare two classes in two units that refer to each other? Why doesn't forward declarations cope with this? I've got this feature in C, C++ and C# why not Delphi? That's a good question... Why can't FPC allow that either? I don't know the internals of FPC, but can't FPC simply keep a list of used units as it compiles, so it simply skips any later references. What is the technical issue? I'm just curious here. Regards, - Graeme - ___ fpGUI - a cross-platform Free Pascal GUI toolkit http://opensoft.homeip.net/fpgui/ ___ fpc-devel maillist - fpc-devel@lists.freepascal.org http://lists.freepascal.org/mailman/listinfo/fpc-devel -- http://ik.homelinux.org/ ___ fpc-devel maillist - fpc-devel@lists.freepascal.org http://lists.freepascal.org/mailman/listinfo/fpc-devel
Re: [fpc-devel] circular uses clauses
Graeme Geldenhuys wrote: Hi. Quote from CodeGear news circular uses clauses - why can't I declare two classes in two units that refer to each other? Why doesn't forward declarations cope with this? I've got this feature in C, C++ and C# why not Delphi? Because a Pascal compiler parses the interface section of an unit only once, ... That's a good question... Why can't FPC allow that either? I don't know the internals of FPC, but can't FPC simply keep a list of used units as it compiles, so it simply skips any later references. What is the technical issue? I'm just curious here. ... and the interface section of an unit need to be parsed before used by another one? Regards, - Graeme - -- Joao Morais ___ fpc-devel maillist - fpc-devel@lists.freepascal.org http://lists.freepascal.org/mailman/listinfo/fpc-devel
