32 lines
1.6 KiB
ReStructuredText
32 lines
1.6 KiB
ReStructuredText
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.. title:: clang-tidy - bugprone-suspicious-memory-comparison
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bugprone-suspicious-memory-comparison
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=====================================
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Finds potentially incorrect calls to ``memcmp()`` based on properties of the
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arguments. The following cases are covered:
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**Case 1: Non-standard-layout type**
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Comparing the object representations of non-standard-layout objects may not
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properly compare the value representations.
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**Case 2: Types with no unique object representation**
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Objects with the same value may not have the same object representation.
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This may be caused by padding or floating-point types.
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See also:
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`EXP42-C. Do not compare padding data
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<https://wiki.sei.cmu.edu/confluence/display/c/EXP42-C.+Do+not+compare+padding+data>`_
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and
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`FLP37-C. Do not use object representations to compare floating-point values
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<https://wiki.sei.cmu.edu/confluence/display/c/FLP37-C.+Do+not+use+object+representations+to+compare+floating-point+values>`_
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This check is also related to and partially overlaps the CERT C++ Coding Standard rules
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`OOP57-CPP. Prefer special member functions and overloaded operators to C Standard Library functions
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<https://wiki.sei.cmu.edu/confluence/display/cplusplus/OOP57-CPP.+Prefer+special+member+functions+and+overloaded+operators+to+C+Standard+Library+functions>`_
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and
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`EXP62-CPP. Do not access the bits of an object representation that are not part of the object's value representation
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<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>`_
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