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V687. Size of an array calculated by th…
Analyzer Diagnostics
General Analysis (C++)
General Analysis (C#)
General Analysis (Java)
Diagnosis of micro-optimizations (C++)
Diagnosis of 64-bit errors (Viva64, C++)
MISRA errors
AUTOSAR errors
Additional information
Contents

V687. Size of an array calculated by the sizeof() operator was added to a pointer. It is possible that the number of elements should be calculated by sizeof(A)/sizeof(A[0]).

March 4, 2014

The analyzer has detected an issue when an array size is added to a pointer, which is strange. Perhaps it is an error, and it is actually the number of the array items instead of its size that should be added to the pointer.

Note. It is safe to work with arrays consisting of bytes (char/unsigned char).

An example of the error:

int A[10];
...
std::sort(A, A + sizeof(A));

The function's first argument is a random-access iterator addressing the position of the first element in the range to be sorted.

The function's second argument is a random-access iterator addressing the position one past the final element in the range to be sorted.

The function call is incorrect: by mistake, the array size is added to the pointer which results in the function trying to sort more elements than necessary.

To fix the bug, the code should be rewritten so that the pointer is summed with the number of array items:

int A[10];
...
std::sort(A, A + sizeof(A) / sizeof(A[0]));

This diagnostic is classified as:

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