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POInheriting Template class or composition errors
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  1. POInheriting Template class or composition errors
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    copied!<p>Hi am a newbie and having problems with class templates. I have tried to use composition and inheritance of a template class but with both ending up in errors. Mainly, errors of this type for several times:</p> <p>error LNK2019: unresolved external symbol.........referenced in function "public: __thiscall.</p> <p>I will show the example for composition. Note that these errors refers to the functions that I have used in the derived class that were from the base class. In this case, function1 and function2 were used and will result in the error above.</p> <p><strong>Base Class</strong></p> <pre><code>#ifndef ClassA_H #define ClassA_H #include &lt;string&gt; using namespace std; template &lt;class T&gt; ClassA { public: void function1 (double z, T i); T function2 (T var); private: double number; T *array T *array2 }; #endif </code></pre> <p><strong>Body</strong></p> <pre><code>template &lt;class T&gt; void ClassA&lt;T&gt;::function1 (double z, T i) {} template &lt;class T&gt; T classA&lt;T&gt;::function2 (T var) {} </code></pre> <p><strong>Composition</strong></p> <pre><code>#ifndef ClassB_H #define ClassB_H #include "ClassA.h" ClassB { public: ClassB(); private: ClassA &lt;int&gt; class; }; #endif </code></pre> <p><strong>Body of class B (.cpp)</strong></p> <pre><code>ClassB::ClassB(){ class.function1(24.3,15); class.function2 (14); } </code></pre> <p>I have done much research where it is solved by using this-> and classb &lt; int > ::function1 and others for template class. But it is not working for my case of inheriting a template class. I then moved on to composition. My linker>System is also set to console. I'm using VS 2012.</p> <p>Thanks for your time guys.</p>
 

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