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POC++: Including header-file fails compilation but including source cpp file compiles
 

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  1. POC++: Including header-file fails compilation but including source cpp file compiles
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    <p>This is probably really simple, but it's hindering me on my way down c++ road. I am currently reading through accelerated c++ and I decided to overkill one of the exercises. It all worked well and my code ran fine until I split it into a header and separate source file. When I import my .cpp source file containing some functions I wrote, everything runs fine. But when I try to import the functions through a header file it fails horribly and I get the following error. I am compiling with gcc from Geany, it's all worked fine until now. Thanks for any help.</p> <p>error:</p> <pre><code>g++ -Wall -o "quartile" "quartile.cpp" (in directory: /home/charles/Temp) Compilation failed. /tmp/ccJrQoI9.o: In function `main': quartile.cpp:(.text+0xfd): undefined reference to `quartile(std::vector&lt;double, std::allocator&lt;double&gt; &gt;)' collect2: ld returned 1 exit status </code></pre> <hr> <p>"stats.h":</p> <pre><code>#ifndef GUARD_stats_h #define GUARD_stats_h #include &lt;vector&gt; std::vector&lt;double&gt; quartile(std::vector&lt;double&gt;); #endif </code></pre> <hr> <p>"stats.cpp":</p> <pre><code>#include &lt;vector&gt; #include &lt;algorithm&gt; #include "stats.h" using std::vector; using std::sort; double median(vector&lt;double&gt; vec){ //code... } vector&lt;double&gt; quartile(vector&lt;double&gt; vec){ //code and I also reference median from here. } </code></pre> <p>"quartile.cpp":</p> <pre><code>#include &lt;iostream&gt; #include &lt;vector&gt; #include "stats.h" //if I change this to "stats.cpp" it works using std::cin; using std::cout; using std::vector; int main(){ //code and reference to quartile function in here. } </code></pre>
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