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V799. Variable is not used after memory…
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
OWASP errors (C#)
Additional information
Contents

V799. Variable is not used after memory is allocated for it. Consider checking the use of this variable.

Jun 19 2017

The analyzer has detected a situation where memory is dynamically allocated for a variable but the variable is not used after that. Review the code or remove the unused variable.

Consider the following example:

void Func()
{
  int *A = new int[X];
  int *B = new int[Y];
  int *C = new int[Z];

  Foo(A, X);
  Foo(B, Y);
  Foo(B, Z);           // <=

  delete [] A;
  delete [] B;
  delete [] C;
}

This code contains a typo: the third call of the 'Foo' function uses the 'B' array instead of the intended 'C' array. The analyzer detects an anomaly here since memory is allocated and freed but not used in any way. This is what the fixed code should look like:

void Func()
{
  int *A = new int[X];
  int *B = new int[Y];
  int *C = new int[Z];

  Foo(A, X);
  Foo(B, Y);
  Foo(C, Z);           // <=

  delete [] A;
  delete [] B;
  delete [] C;
}

You can look at examples of errors detected by the V799 diagnostic.

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