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POMysterious compiler errors with C++ header files referencing each other
 

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  1. POMysterious compiler errors with C++ header files referencing each other
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    <p>OK, this is stumping me. Relative C++ noob, but long experience with C# and other languages. </p> <p>Here's a relatively simple distillation of the problem files:</p> <pre><code>/* GameObject.h */ #pragma once #include &lt;vector&gt; class GameObject { public: std::vector&lt;Component *&gt; *Components; GameObject(); ~GameObject(); }; /* GameObject.cpp */ #include "GameObject.h" #include "Component.h" GameObject::GameObject() { } GameObject::~GameObject() { } /* Component.h */ #pragma once class Component { public: GameObject *Owner; Component(); ~Component(); }; /* Component.cpp */ #include "GameObject.h" #include "Component.h" Component::Component() { } Component::~Component() { } </code></pre> <p>This generates 21 totally irrelevant errors in Visual C++ 2012, I guess stemming from the fact that it couldn't compile Component:</p> <pre><code>C2065: 'Component' : undeclared identifier gameobject.h 10 C2059: syntax error : '&gt;' gameobject.h 10 C2143: syntax error : missing ';' before '}' gameobject.h 14 C2143: syntax error : missing ';' before '{' component.h 3 C2143: syntax error : missing ';' before '}' component.h 11 C2143: syntax error : missing ';' before '{' gameobject.cpp 8 C2143: syntax error : missing ';' before '}' gameobject.cpp 9 C2143: syntax error : missing ';' before '{' gameobject.cpp 13 C2143: syntax error : missing ';' before '}' gameobject.cpp 14 C2143: syntax error : missing ';' before '}' gameobject.cpp 16 C1004: unexpected end-of-file found gameobject.cpp 16 C2065: 'Component' : undeclared identifier gameobject.h 10 C2059: syntax error : '&gt;' gameobject.h 10 C2143: syntax error : missing ';' before '}' gameobject.h 14 C2143: syntax error : missing ';' before '{' component.h 3 C2143: syntax error : missing ';' before '}' component.h 11 C2653: 'Component' : is not a class or namespace name component.cpp 8 C2143: syntax error : missing ';' before '{' component.cpp 8 C2143: syntax error : missing ';' before '}' component.cpp 9 C2653: 'Component' : is not a class or namespace name component.cpp 13 C1903: unable to recover from previous error(s); stopping compilation component.cpp 13 </code></pre> <p>Any ideas? It makes sense in the design for Component to have a pointer to GameObject, and GameObject to have a vector of pointers to Components, so I'm not about to rearchitect to avoid that. I'm guessing I'm just doing something wrong with the header files.</p> <p>Thanks in advance for any ideas, this one's driving me crazy.</p>
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