clang-tidy - bugprone-suspicious-memory-comparison — Extra Clang Tools 18.1.8 documentation

# Extra Clang Tools 18.1.8 documentation

## clang-tidy - bugprone-suspicious-memory-comparison

# bugprone-suspicious-memory-comparison

Finds potentially incorrect calls to `memcmp()` based on properties of the arguments. The following cases are covered:

Case 1: Non-standard-layout type

Comparing the object representations of non-standard-layout objects may not properly compare the value representations.

Case 2: Types with no unique object representation

Objects with the same value may not have the same object representation. This may be caused by padding or floating-point types.

See also: EXP42-C. Do not compare padding data and FLP37-C. Do not use object representations to compare floating-point values

This check is also related to and partially overlaps the CERT C++ Coding Standard rules OOP57-CPP. Prefer special member functions and overloaded operators to C Standard Library functions and EXP62-CPP. Do not access the bits of an object representation that are not part of the object’s value representation