Using the monotonic memory resource

The first one we'll discuss is std::pmr::monotonic_buffer_resource. It's a resource that only allocates memory and doesn't do anything on deallocation. It will only deallocate memory when the resource is destructed or on an explicit call to release(). This, connected with no thread safety, makes this type extremely performant. If your application occasionally needs to perform a task that does lots of allocations on a given thread, then releases all the objects used at once afterward, using monotonic resources will yield great gains. It's also a great base building block for chains of resources.