No warning on deleting a forward declared pointer (Visual Studio)

Question

Deleting forward declared pointers leads to undefined behavior.

Examples:

However, my Visual Studio (VS2012) compiler doesn't warn me about it.

Is this an unfixed VS2012 compiler bug?
Did I disable (or never enable) the corresponding warning?
Is this specific to some project setting?
Visual Leak Detector hinted me to the problem, but is there some method (pragma, code, macro, ...) to detect this at compile time?

The respective warning is [C4150](https://msdn.microsoft.com/en-us/library/ba5dy3f2(v=vs.110).aspx). It is warning level 2 and should be active by default. — Pixelchemist, Jun 09 '15 at 12:19
@Pixelchemist: My warning level was too low. Why not add your comment as an answer so I can accept it... — Martin Hennings, Jun 09 '15 at 12:59
Add a comment to the answer if you want to comment on it or add something but do not edit. — Pixelchemist, Jun 09 '15 at 13:11

Pixelchemist · Accepted Answer · 2015-06-09T13:11:44.160

1

The respective warning is C4150.

It should be active by default and it is categorized in warning level 2 (which should be active too, since default warning level is W3 afaik).

Note: Instead of lowering the warning level, try to pragma warnings in specific cases.

edited Jun 09 '15 at 13:11

answered Jun 09 '15 at 13:06

Pixelchemist

One can give a new warning level to a single warning via compiler flag `/wnxxxx` where n is the new level and xxxx the code of the warning. See [this answer](http://stackoverflow.com/a/4152419/399908). – Martin Hennings Jun 09 '15 at 13:15

1 Answers1