This is the mail archive of the gcc@gcc.gnu.org mailing list for the GCC project.


Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]
Other format: [Raw text]

Re: does gcc support multiple sizes, or not?


Mark Mitchell <mark@codesourcery.com> writes:

| DJ Delorie wrote:
| >> And back to my original answer: it's up to each language to decide
| >> that.
| > 
| > Hence my original question: is it legal or not?  What did the C++
| > developers decide?
| 
| The C++ standard implies that for all pointer-to-object types have the
| same size and that all pointer-to-function types have the same size.
| (Technically, it doesn't say that that; it says that you can convert T*
| -> U* -> T* and get the original value.)  However, nothing in the
| standard says that pointer-to-object types must have the same size as
| pointer-to-function types.

Indeed.  

However, the C++ definition has been amended at the last Lillehammer
meeting to allow that cast as "conditionally supported": either it is
valid or it errors out.  the compiler has to tell.

-- Gaby


Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]