| .. title:: 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 |
| <https://wiki.sei.cmu.edu/confluence/display/c/EXP42-C.+Do+not+compare+padding+data>`_ |
| and |
| `FLP37-C. Do not use object representations to compare floating-point values |
| <https://wiki.sei.cmu.edu/confluence/display/c/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 |
| <https://wiki.sei.cmu.edu/confluence/display/cplusplus/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 |
| <https://wiki.sei.cmu.edu/confluence/display/cplusplus/EXP62-CPP.+Do+not+access+the+bits+of+an+object+representation+that+are+not+part+of+the+object%27s+value+representation>`_ |