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copied!<blockquote> <p>In theory, g++ should compile a class before the one that includes it.</p> </blockquote> <p>g++ should be able to <em>compile</em> your <em>source files</em> in any order it sees fit. The order it <em>includes</em> headers into your source is set by the order of your <code>#include</code> statements.</p> <p>The most likely case is that the class name is <code>room</code>, and not <code>Room</code>. Next likely is that the name is some other thing besides <code>Room</code>. Less likely is that it is in a namespace other than the root namespace.</p> <p>EDIT: Okay, if it's none of those, make sure that the <code>room.h</code> that is being included is your <code>room.h</code> and not some other <code>room.h</code>. Nothing like editing the wrong copy of a file to waste your day.</p> <p>EDIT 2: I'm assuming your header files have the usual include-once structure:</p> <pre><code>#ifndef schedule_h #define schedule_h // header file code goes here. #endif </code></pre> <p>... and that you omitted it for brevity.</p> <p>EDIT 3: I just copied the code you gave to a new directory, and created a dummy <code>day.h</code> file with the contents:</p> <pre><code>typedef int Day; </code></pre> <p>I then used <code>g++ -c -o schedule.o schedule.cpp</code> to build it and got no errors. Therefore the error is something we're not seeing.</p> <p>Edit 4: Okay, sanity check time. Look at the top of <code>room.h</code> and make sure it says</p> <pre><code>#ifndef room_h </code></pre> <p>and not</p> <pre><code>#ifdef room_h </code></pre>

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