There is ISO/IEC TR 24733 draft on decimal floating-point arithmetic. I found old thread by Stefan Slapeta: Decimal floating point library [1] I wonder, what is status of this idea in Boost?
[1] http://lists.boost.org/Archives/boost/2006/02/101457.php
Sadly the GPL license put a blocker on using any of IBM's code inside Boost, as was noted by several people at the time
http://lists.boost.org/Archives/boost/2006/02/101466.php
We need someone to start from scratch in a 'clean room'?
GSoC project?
Maybe not: decNumber is dual licensed (not sure if this is a new development or not), but the C code is available under the terms of the ICU license which is probably Boost-compatible (looks to be nearly the same as the old SGI STL license from which ours is derived) http://source.icu-project.org/repos/icu/icu/trunk/license.html And current decNumber download under those terms from http://speleotrove.com/decimal/#decNumber. HTH, John.