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POUndefined reference to a derived class
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  1. POUndefined reference to a derived class
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    copied!<p>EDIT: RELATED TO <a href="https://stackoverflow.com/questions/12327679/c-undefined-reference-to-vtable/12327728#12327728">c++ undefined reference to `vtable</a></p> <p>I am trying to do a project on inheritance and I'm getting this error:</p> <pre><code>/tmp/ccw1aT69.o: In function `main': main.cpp:(.text+0x15): undefined reference to `Derived::Derived(int)' /tmp/ccw1aT69.o: In function `Derived::~Derived()': main.cpp:(.text._ZN20DerivedD2Ev[_ZN20DerivedD5Ev]+0x13): undefined reference to `vtable for Derived' main.cpp:(.text._ZN20DerivedD2Ev[_ZN20DerivedD5Ev]+0x1f): undefined reference to `Base::~Base()' collect2: ld returned 1 exit status </code></pre> <p>This is my code:</p> <p>main.cpp:</p> <pre><code>#include &lt;iostream&gt; #include "Base.h" #include "Derived.h" int main() { Derived intList(25); } </code></pre> <p>base.h:</p> <pre><code>#ifndef BASE_H #define BASE_H class Base { public: ... Base (const Base&amp; otherList); virtual ~Base(); protected: int *list; int length; int maxSize; }; #endif </code></pre> <p>Base.cpp:</p> <pre><code>#include "Base.h" #include &lt;iostream&gt; using namespace std; ...definitions of my members... Base::Base (int size) { //stuff } Base::~Base() { delete [] list; } Base::Base (const Base&amp; otherList) { //stuff } </code></pre> <p>Derived.h:</p> <pre><code>#ifndef DERIVED_H #define DERIVED_H #include "Base.h" class Derived: public Base { public: ... Derived (int size = 100); ~Derived(); //THIS LINE ADDED AFTER FIRST ANSWER }; #endif </code></pre> <p>Derived.cpp: </p> <pre><code>#include "Derived.h" #include &lt;iostream&gt; using namespace std; Derived::Derived (int size) :Base(size){ } </code></pre> <p>What causes this error? It looks like I can't call the constructor, but it looks fine to me.</p> <p>EDIT: I tried the first solution. Error now:</p> <pre><code>/tmp/ccA4XA0B.o: In function `main': main.cpp:(.text+0x15): undefined reference to `Derived::Derived(int)' main.cpp:(.text+0x21): undefined reference to `Derived::~Derived()' collect2: ld returned 1 exit status </code></pre>
 

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