Undef example

Undef example

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Date added: 04.03.2015
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Usually, #undef is used to scope a preprocessor constant into a very limited region--this is done to avoid leaking the constant (for example, changing a single

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Oct 19, 2008 - I'm wondering about the practical use of #undef in C. I'm working through Or is this really more of a sample that wouldn't occur in reality? (EG Examples: undef $foo;; undef $bar{'blurfl'}; # Compare to: delete $bar{'blurfl'};; undef @ary;; undef %hash;; undef &mysub;; undef *xyz; # destroys $xyz, @xyz, Feb 20, 2011 - Sometimes to make things easier to write and read, I write some local #define macros within functions (for example, #define O_REAL

The #undef directive is typically paired with a #define directive to create a region in a source program in which an identifier has a special meaning. For example $x = undef;. The parentheses after the function name are optional and thus I left them out in the example. As you can see there are a number of ways to get undef Perl undef Function - Learning Perl in simple and easy steps - A beginner's tutorial containing Following is the example code showing its basic usage: #! Nov 26, 2009 - Please note the preprocessing doesn't happen at runtime, the undef ifdef, etc. happen at build time, but for your example, that's not an issue.Learn through examples how to use Perl undef function with scalars, arrays, hashes or subroutines. Example. Note. We introduce the #define and #undef directives at the top of the file. The text defines the symbol B, then defines the symbol A, then undefines the

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