Ok, so what I'm doing is this:
Files:
++++
std/filestat
std/posix/filestat
std/win32/filestat
classes:
+++++++
std/filestat:
=========
class FileStat_class[os, ..others]
{
virtual ...
}
include "std/posix/filestat";
include "std/win32/filestat";
// default to Host OS class
class FileStat {
if PLAT_WIN32 do
inherit Win32FileStat;
else
inherit PosixFileStat;
}
std/posix/filestat:
=============
class PosixFileStat {
// posix specific stuff
type stat_t = "posix_stat";
..
// inherit the generic code
inherit FileStat_class[Posix, stat_t];
// instantiate generic code
instance FileStat_class[Posix, stat_t] {
..
}
}
So now, FileStat works as before for your host OS
However if you're on Linux and want to generate C++ for Windows,
you can write:
Win32FileStat::filetime(s)
The parametric form is:
FileStat_class[os]::filetime(s)
The point of this is that on ANY platform you can generate C++ for ANY
platform with a command line switch:
flx --target=Win32 ....
At present there's no such switch, however you can probably do some
include file tricks to work around it, eg
include "mymacros";
and then set the target OS in that:
typedef os = Win32;
Note the parametric form is DIFFERENT to the "generic" form
in a second way: it GUARANTEES PORTABILITY. Using
FileStat does not, because it inherits platform dependent
features from PosixFileStat (for example) and if you try
to build on Windows you might run aground.
========================================
We should note here: Felix provides two kinds of platform independence.
Some things are done by C++ conditional compilation or link time
library selection. This means the generated C++ is portable to all
platforms.
With the mechanism above, however, the Felix code is portable to
all platforms, but the C++ code is not.
We might recover C++ source portability with plugins, i.e. at the link stage,
in a similar way that C++ is rendered portable by a standard API to the
non-portable implementation of C/C++ libraries.
--
john skaller
skal...@users.sourceforge.net
http://felix-lang.org
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