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POHow to conditionally determine which functions are called at compile time?
 

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  1. POHow to conditionally determine which functions are called at compile time?
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    <p>I'm working on implementing a very, <em>very</em> basic component system in <strong>C</strong>, but now I am at a point where I want to 'dynamically' call some functions. The set-up is very easy: the main program is simply an endless while loop, in which some conditions are checked and in which a "process" function is called for each enabled component.</p> <p>For example, now it works like this:</p> <pre><code>while (1) { input_process(); network_process(); graphics_process(); } </code></pre> <p>But I want to separate it into separate components, and somehow define in a central place which parts are used. This could be done with simple defines, like so:</p> <pre><code>#define HAS_NETWORK ... while (1) { input_process(); #ifdef HAS_NETWORK network_process(); #endif graphics_process(); } </code></pre> <p>As you can see this is alright for 1 or maybe only a few components, but if I want to do this for all of these (input, network and graphics) and additional components in the future, I would have to put separate #ifdefs in there for each of them, and that's quite tedious.</p> <p>In pseudo code, what I'm trying to accomplish is the following:</p> <pre><code>components = {'input', 'network', 'graphics'} ... foreach component in components execute component_process() </code></pre> <p>This way components could easily be added in the future. I don't really mind if the checking is done compile time or run time (although I obviously prefer compile time, but I can imagine run time is easier to implement). I have no idea how to even start.</p>
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    1. COWhy the downvote? I think this is a perfectly reasonable question.
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      1. USBrian Postow
 

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