assert(condition[, message]) patch

[Daniel Keep]

Bruno Medeiros wrote:
> Daniel Keep wrote:
>>
>> BCS wrote:
>>> In article <e5im92$hlo$2 at digitaldaemon.com>, akcom says...
>>> [...]
>>>> Just my thoughts, I think it's definitely got some merits, although
>>>> one must consider that the assert( statementToTest ) would give you
>>>> the line that threw the assert, which makes a message a bit less
>>>> important. 
>>> if the message is non static then a lot of info can be printed.
>>>
>>> assert(str.length < 5, `the string "` ~ str ~ `" is more than 5 char
>>> long");
>>>
>>> I'll vote for this.
>>>
>>
>> I like the idea, but here's a better one that I could have used when
>> testing my MMX routines:
>>
>> # ubyte[] a = new ubyte[4096]; // src1
>> # ubyte[] b = new ubyte[4096]; // src2
>> # ubyte[] c = new ubyte[4096]; // dst
>> # ubyte[] d = new ubyte[4096]; // result calculated "long hand"
>> #
>> # // ...
>> #
>> # adds(a, b, c);
>> # assert(c == d);
>>
>> Working out *why* it's asserted is no fun whatsoever.  YES it's told you
>> there's a bug, but in this case, it hasn't even told you what that bug
>> is.  Just that it exists.
>>
>> In this case, using a message would help; I could tell myself where the
>> assert had failed.  Even better would be a few more asserts:
>>
>> # assertArrayEqual(c, d);
>>
>> Which might print:
>>
>> AssertError foo.d line 2001: mismatch at element 42: expected "6", got
>> "9".
>>
>> I would have KILLED for that a few weeks ago :)  I'd implement that
>> myself, except that `assert` seems to be the ONLY statement in D that
>> automatically passes the source file and line number to the exception.
>>
>> Walter: is there any technical reason why we can't get Exceptions to
>> automatically have source file and line number assigned when
>> instantiated?
>>
> 
> You mean when thrown, no?
> 
>> Hmm.  Seem to have gone off topic somewhat.  Gomen.
>>
>>     -- Daniel
>>
> 
> 

# try
# {
#     // ...
# }
# catch( Exception e )
# {
#     // Hmm... nevermind
#     throw e;
# }

See the problem? :P

-- 
Unlike Knuth, I have neither proven or tried the above; it may not even
make sense.

v2sw5+8Yhw5ln4+5pr6OFPma8u6+7Lw4Tm6+7l6+7D
i28a2Xs3MSr2e4/6+7t4TNSMb6HTOp5en5g6RAHCP  http://hackerkey.com/