Dear All, I'd like to encourage people who are looking at the proposed Multiprecision library to remind themselves of the xint review last year. See e.g. http://thread.gmane.org/gmane.comp.lib.boost.devel/218624 (result) http://thread.gmane.org/gmane.comp.lib.boost.devel/215968 (my review) etc. etc. To what extent do we believe that this new library addresses the weaknesses of the last proposal? It would be great if Vladimir Prus, review manager for xint, could write a review of Multiprecision. Here's my take on it: Multiprecision addresses many of the problems of xint, and also extends the scope into areas that xint did not address at all. However it still suffers some of the same problems: if I want an int128_t that is just 128 bits of data, it doesn't help me. Furthermore, it doesn't help me to build the int128_t that I want. Although Multiprecision is divided into "front" and "back"-ends, this division is not in the right place to let me substitute my own backend that just provides the 128 bits of storage. In the xint reviews, we suggested that the algorithms should be decoupled from the data structures and the same applies here. Similarly, this implementation doesn't provide hooks that would allow me to substitute e.g. assembler implementations of the algorithms. Regards, Phil.