Hi, I believe that a portable implementation of the proposed std::decimal (eg Decimal Types for C++ <http://tiny.cc/63ovcw> for older draft) would be useful. Since the standard specifies a class, a library should be able to achieve close to full compliance. At the moment I believe only gcc supports this. I'm currently working on this for my own purposes, and if there is sufficient interest (and guidance!) might try to expand it into a draft submission. Roadmap: 1. Implement std::decimal (see gcc version, for example) using Intel FP Decimal, DecNumber, native gcc, (maybe .NET Decimal depending on how close it is to complying with interface) 2. Some preprocessor trickery to make it easy to compile all implementation as separate classes (eg extension::decimal::Intel::decimal64), or a given implementation as the 'one true' class (extension::decimal::decimal64). This means unit tests and performance tests can be written using one implementation against another, and for production code, a given implementation can be used under the hood depending on the architecture. 3. Create performance and standards-compliance benchmarks for implementations. 4. Choose default implementation for each supported architecture, based on benchmarks. The above is a personal roadmap, of which a subset may be of interest to the boost community. Please let me know if you think this would be of value, and in particular if you would like to be involved in creating / testing / using this. Regards, Josh.