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POC++ including a ".h" file, function duplication confusion
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  1. POC++ including a ".h" file, function duplication confusion
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    copied!<p>I'm currently writing a program, and couldn't figure out why I got an error (note: I already fixed it, I'm curious about WHY the error was there and what this implies about including .h files).</p> <p>Basically, my program was structured as follows:</p> <p>The current file I'm working with, I'll call <code>Current.cc</code> (which is an implementation of <code>Current.h</code>).</p> <p><code>Current.cc</code> included a header file, named <code>CalledByCurrent.h</code> (which has an associated implementation called <code>CalledByCurrent.cc</code>). <code>CalledByCurrent.h</code> contains a class definition.</p> <p>There was a non-class function defined in <code>CalledByCurrent.cc</code> called <code>thisFunction()</code>. <code>thisFunction()</code> was not declared in <code>CalledByCurrent.h</code> since it was not actually a member function of the class (just a little helper function). In <code>Current.cc</code>, I needed to use this function, so I just redefined <code>thisFunction()</code> at the top of <code>Current.cc</code>. However, when I did this, I got an error saying that the function was duplicated. Why is this, when <code>myFunction()</code> wasn't even declared in <code>CalledByCurrent.h</code>? </p> <p>Thus, I just removed the function from <code>Current.cc</code>, now assuming that <code>Current.cc</code> had access to <code>thisFunction()</code> from <code>CalledByCurrent.cc</code>. However, when I did this, I found that <code>Current.cc</code> did not know what function I was talking about. What the heck? I then copied the function definition for <code>thisFunction()</code> to the top of my <code>CalledByCurrent.h</code> file and this resolved the problem. Could you help me understand this behavior? Particularly, why would it think there was a duplicate, yet it didn't know how to use the original?</p> <p>p.s - I apologize for how confusing this post is. Please let me know if there's anything I can clear up.</p>
 

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