RE: [boost] Is there interest in a decimal floating-point class?

From: Max Khesin (MKhesin_at_[hidden])
Date: 2004-05-20 08:51:38

I think this is very valuable, but I really doubt boost library guidelines
would allow including a wrapper over a C library, as the C library certainly
would not be confirming with boost coding (and possibly licensing)
standards. Perhaps you should propose your wrapper as the library interface,
if you are willing to reimplement the guts later.
m

> -----Original Message-----
> From: Richard Kaiser [mailto:rk_at_[hidden]]
> Sent: Thursday, May 20, 2004 9:03 AM
> To: boost_at_[hidden]
> Subject: [boost] Is there interest in a decimal floating-point class?
> 
> 
> I want to ask the boost community if there is interest in a decimal 
> floating-point class implementing one or more of the decimal 
> floating-point types that are intended to become part of a 
> future C and 
> C++ standard.
> 
> This class would be a wrapper class around Mike Cowlishaws 
> decNumber C 
> library. You can take a look at my first preliminary version 
> (it is just 
> a first try, the design is far from perfect, it is incomplete, its 
> notation is inconsistent and not according to boost conventions) at
> 
> http://www.rkaiser.de/rkaiser/DecFPClass/DecFPClass.html
> 
> Most of its operators work as they should do, and most of Mikes 
> testcases pass successfully. The function 
> DecimalFloat_Testcases("d:\\cpp.boo\\decnumber\\decnumberclass
\\decTest\\") 
in my test program test_rk reads all the testcases from Mikes decTest 
files and logs each testcase in a file (bcb files were created with 
Borland C++Builder 6, gcc with MinGW g++, and msc with MS Visual Studio 
..Net). With “grep "###number" *.log” you get the summary lines:

  File abs.decTest_bcb.log:    ###number of tests passed=87  failed=2
  File abs.decTest_gcc.log:    ###number of tests passed=87  failed=2
  File abs.decTest_msc.log:    ###number of tests passed=87  failed=2
  File add.decTest_bcb.log:    ###number of tests passed=773 failed=45
  File add.decTest_gcc.log:    ###number of tests passed=773 failed=46
  File add.decTest_msc.log:    ###number of tests passed=773 failed=45
  ...

If the boost community is interested, if I find enough time, and if 
everything works as intended, the resulting classes would be a reference 
implementation for the new standard decimal floating point types, or at 
least a close one.

I posted this request already some days ago, but by mistake I have 
posted it as a reply to a message it did not belong to. Sorry.

Richard Kaiser

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