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POProblems with linking .cpp files in Code::Blocks
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copied!<p>I'm having a headerfile called <em>cnVector.h</em> whose implementation is written in <em>cnVector.cpp</em>. Those two files are located in the same directory.</p> <pre><code>cNormalCBP/ + src/ + cNormal/ + cnUtils/ - cnVector.h - cnVector.cpp - main.cpp </code></pre> <p>The header contains a simple class definition.</p> <pre><code>class cnVector { public: cnVector(double, double, double); inline cnVector cross(const cnVector&) const; }; </code></pre> <p>The implementation in the <em>.cpp</em> file is as follows:</p> <pre><code>#include "cnVector.h" /* constructor */ cnVector::cnVector(double x, double y, double z) : x(x), y(y), z(z) { } cnVector cnVector::cross (const cnVector& vOther) const { return cnVector( y * vOther.z + z * vOther.y, z * vOther.x + x * vOther.z, x * vOther.y + y * vOther.x ); } </code></pre> <p>Now, the following code from <em>main.cpp</em> breaks at line <strong>3</strong> because of an <em>undefined reference to cnVector::cross(cnVector const&) const;</em><br> Note how the constructor-implementation is recognized, but not the <code>cnVector::cross</code> method.</p> <pre><code>int main() { cnVector v1(1, 0, 0), v2(0, 1, 0); cnVector v3 = v1.cross(v2); } </code></pre> <p>I also get an error-message <em>warning: inline function 'cnVector cnVector::cross(const cnVector&) const' used but never defined</em>.<br> Copying the implementation into <em>main.cpp</em> works.</p> <blockquote> <p>Can you explain to me why I can construct a <em>cnVector</em> instance but the implementation of other methods are not recognized ?</p> </blockquote>

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