Assert and the optional Message

[Regan Heath]

On Fri, 09 Mar 2012 08:20:33 -0000, Chris Pons <cmpons at gmail.com> wrote:

> Any idea why, system("PAUSE") does work?

As Jonathan says, assert throws AssertError... which means, if you wanted  
to you could catch it, for example...

module asserting;

import std.stdio;
import core.exception;

debug
{
     import std.c.windows.windows;
     extern (C) int kbhit();
}

void main()
{
     try
     {
         assert(false, "testing assert");
     }
     catch(AssertError e)
     {
         debug
         {
             writefln("Assertion failed: %s", e);
             writefln("Press any key to exit...");
             while(!kbhit())
                 Sleep(1);
         }
         throw e;
     }
}

So, for debug builds your exe will output the assertion manually, and wait  
for a key press.  Then re-throw the assertion (resulting in the d runtime  
outputting the assertion again).  In release, no pause.

Note: kbhit and Sleep are windows specific (sleep would be the unix  
equivalent, not sure on one for kbhit).

Regan Heath

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