There have been C++ templates written that use jemalloc-specific calls; for instance see Folly from facebook. I haven't taken a close look, but I know they do some jemalloc-specific code: https://github.com/facebook/folly/tree/master/folly

The other allocated-related thing that C++ really wants (and could benefit C as well) is "sized deallocation". Most of the time you often know the exact size of the memory you allocated. If you could pass that to free() the allocator could save some work determining it. In the case of C++ the compiler can often do this on your behalf for many "delete" calls (at least in the cases where it knows the exact type). Google did an implementation of this idea and got good results. They submitted a proposal to the standards body but I don't know if there is any recent activity. I hope it does happen though: http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n353...