Hi, We have a custom memory allocator and we don't do global operator new/delete override for the obvious reasons. While the container classes being provided by Boost get the allocator as a template arguments, there are a lot of classes which do contain string and vector inside them, but don't provide the allocator as template arguments. May i request to have a coding standard to provide allocators as template arguments in all the classes that maintain private heap directly /indirectly( through the other containers )? To name a few, i saw the implementation of Boost Format, which provides the allocator for string, but not for the vectors. I also looked at the Boost filesystem, which has a string inside, but restricts itself to std::allocator. Thanks, Gokul.