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POI don't understand this link error
 

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  1. POI don't understand this link error
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    <p>I don't understand this link error. I have 2 classes:</p> <pre><code>#include "Vector3.h" #include "Quaternion.h" template&lt;typename T&gt; class Point3 final { public: constexpr Point3(const Vector3&lt;T&gt;&amp; vec) : x(vec.x), y(vec.y), z(vec.z) {} constexpr operator const Vector3&lt;T&gt;() const { // It is the equivalent of Vector3 = Point3 - Origin return Vector3&lt;T&gt;(x, y, z); } constexpr operator Vector3&lt;T&gt;() const { // It is the equivalent of Vector3 = Point3 - Origin return Vector3&lt;T&gt;(x, y, z); } T x = T(0); T y = T(0); T z = T(0); friend Vector3&lt;T&gt;; friend Quaternion&lt;T&gt;; friend Vector3&lt;T&gt; operator*( const Quaternion&lt;T&gt;&amp; lhs, const Vector3&lt;T&gt;&amp; rhs); friend Vector3&lt;T&gt; operator*( Vector3&lt;T&gt; lhs, const Vector3&lt;T&gt;&amp; rhs); }; typedef Point3&lt;Float32&gt; Point3f; </code></pre> <p>and</p> <pre><code>template&lt;typename T&gt; class Vector3 final { public: constexpr Vector3() {} constexpr Vector3(T _x, T _y, T _z) : x(_x), y(_y), z(_z) {} T x = T(0); T y = T(0); T z = T(0); }; typedef Vector3&lt;Float32&gt; Vector3f; </code></pre> <p>I also have a Quaternion class the detail are irrelevant i beleive but this class has a non member operator*:</p> <pre><code> template&lt;typename T&gt; Vector3&lt;T&gt; operator*( const Quaternion&lt;T&gt;&amp; lhs, const Vector3&lt;T&gt;&amp; rhs) { // nVidia SDK implementation Vector3&lt;T&gt; qvec(lhs.x, lhs.y, lhs.z); Vector3&lt;T&gt; uv = cross(qvec, rhs) * T(2.0) * lhs.w; //uv = qvec ^ v; Vector3&lt;T&gt; uuv = cross(qvec, uv) * T(2.0); //uuv = qvec ^ uv; return rhs + uv + uuv; } </code></pre> <p>Now those line produce a link error, but why?</p> <pre><code>Math::Point3&lt;Float32&gt; pt = -Math::Point3&lt;Float32&gt;::UNIT_Z; Math::Vector3&lt;Float32&gt; vec = orientation_*pt; // link error here (orientation is a Quaternion&lt;Float32&gt;) //Math::Vector3&lt;Float32&gt; vec = orientation_*Math::Vector3&lt;Float32&gt;(pt); // this solve the link error. </code></pre> <p>Here is the link error</p> <pre><code>Undefined symbols for architecture x86_64: Math::operator*(Math::Quaternion&lt;float&gt; const&amp;, Math::Vector3&lt;float&gt; const&amp;), referenced from: GfxObject::Procedural::BoxGenerator::addToTriangleBuffer(GfxObject::Procedural::TriangleBuffer&amp;) const in ProceduralBoxGenerator.o </code></pre> <p><strong>Update</strong></p> <p>I found 2 question that are really close to this but the problem relies in the differences.</p> <p>in: <a href="https://stackoverflow.com/questions/10375626/implicit-conversion-lookup-on-template-fails-for-friend-function-defined-outside">question 1</a> and <a href="https://stackoverflow.com/questions/8890051/implicit-conversion-when-overloading-operators-for-template-classes">question 2</a></p> <p>But in my case I need to convert between 2 templates classes instead of the same class but 2 instantions. I hope this will help!</p>
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    1. COYou do **not** have two classes plus a Quaternion class. You have three **templates**.
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      1. USPete Becker
    2. COThere needs to be at least one instantiation of the templated `operator*`. It should either be placed in a header file included by the source file that uses it or explicitly instantiated in the source file containing the `operator*`
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      1. USCaptain Obvlious
    3. CO@PeteBecker Yes I have 3 template classes. But I beleive the problem arise from the 2 template classes Vector3 and Point3.
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