Re: Assert and the optional Message

[Regan Heath]

On Fri, 09 Mar 2012 08:20:33 -0000, Chris Pons <cmp...@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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