On Mon, Sep 28, 2009 at 12:35 PM, bearophile <bearophileh...@lycos.com> wrote: > Beside the known ones, like computed gotos and __builtin_expect(), GCC has > other less known extensions, you can find some of them here: > http://www.ibm.com/developerworks/linux/library/l-gcc-hacks/ > > They are used by Linux. If D wants to be a system language, such small things > may be useful if you want to build a kernel with D. > > One of them is the Range extension, it seems GCC devs think that 3 points are > better after all: > > switch (major_idx) { > case 0: > return SCSI_DISK0_MAJOR; > case 1 ... 7: > return SCSI_DISK1_MAJOR + major_idx - 1; > case 8 ... 15: > return SCSI_DISK8_MAJOR + major_idx - 8; > default: > BUG(); > return 0; > } > > > Triple points can be used for initializations too: > int widths[] = { [0 ... 9] = 1, [10 ... 99] = 2, [100] = 3 }; > > > The __builtin_return_address() looks interesting, but I don't understand > where it can be useful. > > > The Constant detection done with __builtin_constant_p(exp) is what I was > asking for in one of my recent posts here. It seems I was "right" again. > > > The article also shows some of the function attributes, in truth in GCC there > are many other of such attributes. Some of them are useful for D too. > > The good thing of adding some of those things to D is that they can be put in > the specs, so they don't become nonstandard extensions as in GCC, this avoids > several troubles.
I think it's kind of silly that you constantly whine to Walter whenever he adds new features saying "why don't we fix the problems that already exist in D like the module system," and then turn around suggesting we add a bunch of features. Which do you want? Do you want new features, or do you want things to be fixed?
