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PODeclaring function Templates within a namspace and using in a class
 

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    <blockquote> <p><strong>Possible Duplicate:</strong><br> <a href="https://stackoverflow.com/questions/495021/why-can-templates-only-be-implemented-in-the-header-file">Why can templates only be implemented in the header file?</a><br> <a href="https://stackoverflow.com/questions/4100893/undefined-reference-to-template-members">Undefined reference to template members</a><br> <a href="https://stackoverflow.com/questions/5612791/c-template-and-header-files">c++ template and header files</a> </p> </blockquote> <p>I am getting a compiler error when using a function template in a class. The function template was declared in a namespace in a separate source and header file. </p> <p>Here is some example code.</p> <pre><code>namespace A header file namespace A { ... ... template&lt;typename T1, typename T2 &gt; bool OR(T1* j, vector&lt;T2*&gt;, float cut); ... ... } A cpp file namespace A { ... ... template&lt;typename T1, typename T2 &gt; bool OR(T1* j, vector&lt;T2*&gt;, float cut){ .... .... } } </code></pre> <p>I then use this namespace in a class</p> <pre><code>class B cpp file ( only member function) #include "A.h" void B::exmaple(){ if(A::OR(m_ptrObj, m_ptrvectortoOtherObj, m_cut)){ cout &lt;&lt; "its true" &lt;&lt; endl; } } </code></pre> <p>So the compiler error I get is as follows (Note this is the error from my real code, but same idea).</p> <pre><code>undefined reference to `bool JetFilters::OR&lt;Jet, Jet&gt;(Jet*, std::vector&lt;Jet*, std::allocator&lt;Jet*&gt; &gt;*, float) </code></pre> <p>Any ideas why I am getting the above error??</p>
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