On Thu, 21 Mar 2013, N.M. Maclaren wrote: > On Mar 19 2013, Tobias Burnus wrote: > > Am 19.03.2013 13:15, schrieb Janne Blomqvist: > > > > > now that the Fortran frontend is C++ we can use the primitive bool > > > type instead of inventing our own. > > > > Well, C99's "bool" (_Bool) was already used before. ... > > Er, that is making a serious mistake or, at least, running the risk of > one. C++'s bool and C99's _Bool are NOT compatible types. The UK tried > to get _Bool either made compatible with C++ or (preferably) dropped, but > failed in both.
They have been ABI-compatible in GCC ever since I implemented C99 _Bool (as opposed to the different, incompatible version in earlier C9X drafts) in <http://gcc.gnu.org/ml/gcc-patches/2000-10/msg01127.html>, and the semantics are essentially the same except that C++ disallows decrement operators (prefix and postfix --) on bool and C allows them. (I don't know what C++ specifies regarding bool bit-fields or whether there are any incompatibilities there, but for non-bit-field objects you shouldn't have problems.) -- Joseph S. Myers jos...@codesourcery.com
