wrapper: check if __cpp_sized_deallocation is defined
wrapper: check if __cpp_sized_deallocation is defined

Otherwise I get this error on recent clang:

Heap-Layers/wrappers/wrapper.cpp:453:5: warning: '__cpp_sized_deallocation' is not defined, evaluates to 0 [-Wundef]
    ^

emeryberger/Heap-Layers,emeryberger/Heap-Layers,emeryberger/Heap-Layers