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    <p>Imho, generating the headers from the source is a bad idea and is unpractical.</p> <p>Headers can contain more information that just function names and parameters.</p> <p>Here are some examples:</p> <ul> <li>a <code>C++</code> header can define an <em>abstract</em> class for which a source file may be unneeded</li> <li>A template can only be defined in a header file</li> <li>Default parameters are only specified in the class definition (thus in the header file)</li> </ul> <p>You usually write your header, then write the implementation in a corresponding source file.</p> <p>I think doing the other way around is counter-intuitive and doesn't fit with the spirit of <code>C</code> or <code>C++</code>.</p> <p>The only exception is can see to that is the <strong>static</strong> functions. A static function only appears in its source file (<code>.c</code>or <code>.cpp</code>) and can't (obviously) be used elsewhere.</p> <p>While I agree it is often annoying to copy the header definition of a method/function to the source file, you can probably configure your code editor to ease this. I use Vim and a quick script helped me with this <strong>a lot</strong>. I guess a similar solution exists for most other editors.</p> <p>Anyway, while this can seem annoying, keep in mind it also gives a greater flexibility. You can distribute your header files (<code>.h</code>, <code>.hpp</code> or whatever) and then transparently change the implementation in source files afterward.</p> <p>Also, just to mention it, there is no such thing as <code>C/C++</code>: there is <code>C</code> and there is <code>C++</code>; those are different languages (which indeed share much, but still).</p>
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    1. POWays not to write function headers twice?
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    1. COGood point about extra information in headers - might want to mention default parameters for member functions can only be specified in the header, and most template code lives in headers only.
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    2. CO@AshleysBrain: Nice examples indeed. Added them to my answer. Thanks !
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