Heap Layers is a template-based infrastructure for building memory allocators. The infrastructure is remarkably flexible and composable, and the resulting memory allocators are as fast or faster than counterparts written in conventional C or C++. These allocators can be used as plug-in replacements for malloc/free, or as application-specific (custom) allocators, usable on their own or in the STL.

Allocators included with Heap Layers include the Hoard scalable memory allocator (http://www.hoard.org) and the Reap hybrid region-heap memory manager.