[cfe-dev] hexfloats in c++0x

Howard Hinnant hhinnant at apple.com
Thu Jan 27 12:01:09 PST 2011

On Jan 27, 2011, at 2:48 PM, Douglas Gregor wrote:

> On Jan 27, 2011, at 10:50 AM, Howard Hinnant wrote:
>> Can we turn on support for hexfloats in -std=c++0x?  It is already turned on in c++03 mode.
>> get_double.pass.cpp:108:14: error: invalid suffix 'p' on integer constant
>>       assert(v == 0x125p-1);
>>       ^
> They're disabled in C++0x mode because they conflict with user-defined literals. We might be able to jump through some hoops to see if there's a literal operator named "p" or "P" in scope, but... yuck.
> Suggestions welcome!

<sigh> That's a serious design flaw / incompatibility in C++0x.  hexfloat literals are one of the better features of C99.  We even enshrined hex-float formatting in the C++0x library.  What a mess...


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