Subject:
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Re: Design by Contract (long post)
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Newsgroups:
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lugnet.robotics.rcx
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Date:
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Thu, 8 Jan 2004 16:52:02 GMT
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Viewed:
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3352 times
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In lugnet.robotics.rcx, Tim McSweeney wrote:
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<delurk>
The first definition of assert is the correct, standard definition. However
there is a slight boo boo in the original post in the line:
assert (myptr = malloc (sizeof (mystruct));
Which will delete the malloc when NDEBUG is defined. It’s a classic mistake
that bites even experienced programmers now and then.
the easy way round it is to write:
myptr = malloc (sizeof (mystruct));
assert(myptr!=NULL);
thus, the malloc always takes place, but the assert only occurs in debug
builds.
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D’oH! Thanks, Tim. I was very careful composing the original post, but added
the example in as an after thought - Well spotted.
Iain.
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Message has 1 Reply:
 | | Re: Design by Contract (long post)
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| (...) For more fun with asserts: See if your compiler supports the FILE and LINE macros (or something equivilant). #ifdef NDEBUG #define assert(x) ((void)0) #else #define assert(x) if (x) else assertfail(FILE,LINE); #endif your assert_fail function (...) (21 years ago, 9-Jan-04, to lugnet.robotics.rcx, FTX)
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Message is in Reply To:
| | Re: Design by Contract (long post)
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| (...) <delurk> The first definition of assert is the correct, standard definition. However there is a slight boo boo in the original post in the line: assert (myptr = malloc (sizeof (mystruct)); Which will delete the malloc when NDEBUG is defined. (...) (21 years ago, 8-Jan-04, to lugnet.robotics.rcx, FTX)
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