V558. Function returns the pointer/reference to temporary local object.

The analyzer detected an issue when a function returns a pointer to a local object. This object will be destroyed when leaving the function, so you will not be able to use the pointer to it anymore.

In a most common case, this diagnostic message is generated against the following code:

float *F()
{
  float f = 1.0;
  return &f;
}

Of course, the error would hardly be present in such a form in real code. Let's consider a more real example.

int *Foo()
{
  int A[10];
  // ...
  if (err)
    return 0;
  
  int *B = new int[10];
  memcpy(B, A, sizeof(A));

  return A;
}

Here, we handled the temporary array A. On some condition, we must return the pointer to the new array B. But the misprint causes the A array to be returned, which will cause unexpected behavior of the program or crash. This is the correct code:

int *Foo()
{
  ...  
  int *B = new int[10];
  memcpy(B, A, sizeof(A));
  return B;
}

This diagnostic is classified as:

You can look at examples of errors detected by the V558 diagnostic.


Bugs Found

Checked Projects
417
Collected Errors
14 279
This website uses cookies and other technology to provide you a more personalized experience. By continuing the view of our web-pages you accept the terms of using these files. If you don't want your personal data to be processed, please, leave this site. Learn More →
Accept