[Boost-users] multiple implicit constructors (MPL?)

Hello, I have a class, large_integer<BaseT>. I build 256bit integers by doing: typedef large_integer<unsigned long long> uint128; typedef large_integer<uint128> uint256; Unfortunately C++ only seems to allow one implicit conversion, so I'm unable to do uint256 a = 0, and have to do uint256 a = uint128(0); instead. I'm able to get around one of these by having a constructor which takes the base type, but that only gets me one free conversion, meaning a uint512 has the same issue. Is there a way around this (I'm guessing MPL would be my best bet?)? -- Cory Nelson http://www.int64.org