# Extra Clang Tools 21.1.8 documentation

## clang-tidy - cert-mem57-cpp

# cert-mem57-cpp

This check flags uses of default `operator new` where the type has extended alignment (an alignment greater than the fundamental alignment). (The default `operator new` is guaranteed to provide the correct alignment if the requested alignment is less or equal to the fundamental alignment). Only cases are detected (by design) where the `operator new` is not user-defined and is not a placement new (the reason is that in these cases we assume that the user provided the correct memory allocation).

This check corresponds to the CERT C++ Coding Standard rule MEM57-CPP. Avoid using default operator new for over-aligned types.