Hi, The Boost.Conversion library (Generic explicit conversion between unrelated types) has not revealed too much interest for the Boost community since v0.4 was released on 10/09. For those that don't know it yet you can get the documentation and download links from https://svn.boost.org/trac/boost/wiki/LibrariesUnderConstruction#Boost.Conve... I have added on the sandbox some pending issues that Jeffrey Hellrung related to conversions that need extra information. If B1 is covertible to A1 using convert_to, now we can conver vectors of conversible types. B1 b10, b11, b12, b13; std::vector<B1> vb2; vb2[0]=b10; vb2[1]=b11; vb2[2]=b12; vb2[3]=b13; std::vector<A1> va2(boost::convert_to<std::vector<A1> >(vb2)) std::vector<A1,std::allocator<A1> > va6( boost::convert_to<std::vector<A1,std::allocator<A1> > >(pack(vb2, std::allocator<A1>()))); Note that when the Target constructor has some arguments (as is the case for vector with a specific allocator) we pack the Source and the Target arguments in a pack. The first argument is the Source. boost::conversion::pack(vb2, std::allocator<A1>()) The function 'pack' is currently a little bit rudimentary, but is usable already for vector conversions using a specific allocator. Currently accepts only two parameters, I plan to go up to 5 parameters. Any suggestion for better namming 'boost::conversion::pack'. I have no solution for the ambiguity problem of a user getting two different overloads of the same conversion on different namespaces, other than suggesting that convert_to overloadings should be done on the namespace of the Source, for example. Jeffrey does this answer to your attends? I will release the pack function and vector conversion (v.0.5) on the Vault once I will update the documentation. Comments are welcome :) Best, _____________________ Vicente Juan Botet Escribá http://viboes.blogspot.com/