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POSplitting templated C++ classes into .hpp/.cpp files--is it possible?
 

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  1. POSplitting templated C++ classes into .hpp/.cpp files--is it possible?
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    <p>I am getting errors trying to compile a C++ template class which is split between a <code>.hpp</code> and <code>.cpp</code> file:</p> <pre><code>$ g++ -c -o main.o main.cpp $ g++ -c -o stack.o stack.cpp $ g++ -o main main.o stack.o main.o: In function `main': main.cpp:(.text+0xe): undefined reference to 'stack&lt;int&gt;::stack()' main.cpp:(.text+0x1c): undefined reference to 'stack&lt;int&gt;::~stack()' collect2: ld returned 1 exit status make: *** [program] Error 1 </code></pre> <p>Here is my code:</p> <p><strong>stack.hpp</strong>:</p> <pre><code>#ifndef _STACK_HPP #define _STACK_HPP template &lt;typename Type&gt; class stack { public: stack(); ~stack(); }; #endif </code></pre> <p><strong>stack.cpp</strong>:</p> <pre><code>#include &lt;iostream&gt; #include "stack.hpp" template &lt;typename Type&gt; stack&lt;Type&gt;::stack() { std::cerr &lt;&lt; "Hello, stack " &lt;&lt; this &lt;&lt; "!" &lt;&lt; std::endl; } template &lt;typename Type&gt; stack&lt;Type&gt;::~stack() { std::cerr &lt;&lt; "Goodbye, stack " &lt;&lt; this &lt;&lt; "." &lt;&lt; std::endl; } </code></pre> <p><strong>main.cpp</strong>:</p> <pre><code>#include "stack.hpp" int main() { stack&lt;int&gt; s; return 0; } </code></pre> <p><code>ld</code> is of course correct: the symbols aren't in <code>stack.o</code>.</p> <p>The answer to <a href="https://stackoverflow.com/questions/687448">this question</a> does not help, as I'm already doing as it says.<br> <a href="https://stackoverflow.com/questions/1111440/undefined-reference-error-for-template-method">This one</a> might help, but I don't want to move every single method into the <code>.hpp</code> file&mdash;I shouldn't have to, should I?</p> <p>Is the only reasonable solution to move everything in the <code>.cpp</code> file to the <code>.hpp</code> file, and simply include everything, rather than link in as a standalone object file? That seems <strong>awfully</strong> ugly! In that case, I might as well revert to my previous state and rename <code>stack.cpp</code> to <code>stack.hpp</code> and be done with it.</p>
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