Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <blockquote> <p>And why is AccessViolationException different than our own thrown exceptions?</p> </blockquote> <p>Because an AV is special, it is an exception that is triggered by the processor itself. Raised when it signals that is no longer capable of executing code. That's as bad a mishap as you can possibly imagine. Recovering from an AV is very, very difficult and should in general never be attempted. You cannot reason about the state of your program anymore, you don't know where it died beyond just a raw instruction address.</p> <p>Catching and handling an AV is technically possible, you have to use Structured Exception Handling. It requires using the non-standard __try and __except keywords in MSVC++. But you should not do that, since handling an exception requires you to also restore the state of your program to the state it had before you ran the code that failed. Impossible to do reliably since you cannot reason about that state anymore, you don't know what code was skipped by the exception.</p> <p>You can get your program to shutdown in a somewhat reasonable way, it requires using the SetUnhandledExceptionFilter() winapi function. The equivalent of AppDomain.UnhandledException in C#. All of this is entirely non-standard C++ of course. The C++ standard dictates that a conforming C++ program should never invoke undefined behavior and does not specify what should happen when you do anyway.</p> <p>This is otherwise a direct consequence of programming close to the metal. There are a <em>lot</em> of counter-measures in managed code to prevent a program from ever getting into a state like this. These counter-measure do not come for free, native C++ cares about making code run as fast as possible. Losing diagnostics is part of that trade-off. Don't invoke undefined behavior.</p>
    singulars
    1. This table or related slice is empty.
    1. POC++ Visual Studio debugging with call stack
      singulars
      1. PTQuestion
    1. PTAnswer
    1. This table or related slice is empty.
    1. USHans Passant
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. POC++ Visual Studio debugging with call stack
      singulars
      1. PTQuestion
    1. This table or related slice is empty.
    1. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTAcceptedByOriginator
    2. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    3. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    1. This table or related slice is empty.
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload