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C6334

Visual Studio 2008

warning C6334: sizeof operator applied to an expression with an operator may yield unexpected results

This warning indicates a misuse of the sizeof operator. The sizeof operator, when applied to an expression, yields the size of the type of the resulting expression.

For example, in the following code:

     char     a[10];
     size_t   x;

     x = sizeof (a - 1);

x will be assigned the value 4, not 9, because the resulting expression is no longer a pointer to the array a, but simply a pointer.

Example

The following code generates this warning:

void f( )
{   
  size_t x;
  char a[10];

  x= sizeof (a - 4);
  // code...
}

To correct this warning, use the following code:

void f( )   
{
  size_t x;
  char a[10];

  x= sizeof (a) - 4;
  // code...
}

Reference

sizeof Operator

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