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PO"undefined reference to" linking on Ubuntu
 

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    <p>I'm relatively new to C &amp; C++ and stuck at compiling (or should I say linking) for the whole 2 days. Anyone gives me an idea would be appreciated. Error message and 3 code files are below. These are what I cut down to minimum from I'm actually working on so that you guys can take a better glimpse at.</p> <p>Env: Ubuntu 10.10, Eclipse Indigo CDT, g++ (Ubuntu/Linaro 4.4.4-14ubuntu5) 4.4.5</p> <p>Error message:</p> <pre class="lang-none prettyprint-override"><code>**** Build of configuration Debug for project SceneRec2 **** make all Building file: ../src/AdaBoost.cpp Invoking: GCC C++ Compiler g++ -I"/home/ubuntuLove/Documents/workspace_eclipse/SceneRec2/Includes" -I/usr/src/linux-headers-2.6.35-30/arch/um/include/shared -O0 -g3 -Wall -c -fmessage-length=0 -MMD -MP -MF"src/AdaBoost.d" -MT"src/AdaBoost.d" -o "src/AdaBoost.o" "../src/AdaBoost.cpp" Finished building: ../src/AdaBoost.cpp Building file: ../src/AdaMain.cpp Invoking: GCC C++ Compiler g++ -I"/home/ubuntuLove/Documents/workspace_eclipse/SceneRec2/Includes" -I/usr/src/linux-headers-2.6.35-30/arch/um/include/shared -O0 -g3 -Wall -c -fmessage-length=0 -MMD -MP -MF"src/AdaMain.d" -MT"src/AdaMain.d" -o "src/AdaMain.o" "../src/AdaMain.cpp" ../src/AdaMain.cpp: In function ‘int main(int, char**)’: ../src/AdaMain.cpp:6: warning: deprecated conversion from string constant to ‘char*’ Finished building: ../src/AdaMain.cpp Building target: SceneRec2 Invoking: GCC C++ Linker g++ -o "SceneRec2" ./src/AdaBoost.o ./src/AdaMain.o ./src/AdaMain.o: In function `main': /home/ubuntuLove/Documents/workspace_eclipse/SceneRec2/Debug/../src/AdaMain.cpp:5: undefined reference to `AdaBoost&lt;double&gt;::AdaBoost()' /home/ubuntuLove/Documents/workspace_eclipse/SceneRec2/Debug/../src/AdaMain.cpp:6: undefined reference to `AdaBoost&lt;double&gt;::readFromFile(char*)' /home/ubuntuLove/Documents/workspace_eclipse/SceneRec2/Debug/../src/AdaMain.cpp:8: undefined reference to `AdaBoost&lt;double&gt;::~AdaBoost()' /home/ubuntuLove/Documents/workspace_eclipse/SceneRec2/Debug/../src/AdaMain.cpp:8: undefined reference to `AdaBoost&lt;double&gt;::~AdaBoost()' collect2: ld returned 1 exit status make: *** [SceneRec2] Error 1 **** Build Finished **** </code></pre> <p>Note-1. I receive the same result when I execute g++ on terminal.</p> <p>Note-2. The path of .o files in the argument for linker should be correct (./src/###.o).</p> <p>AdaBoost.h</p> <pre><code>#ifndef _ADABOOST_H #define _ADABOOST_H #include &lt;iostream&gt; const double eps = 2.2204e-16; template&lt;class T&gt; class AdaBoost { int N; //Number of Instances int D; //Number of Dimensions int nL; //Number of Learners / Classifiers / Rules T** fVectors; int* labels; void learnRule(int t, double* dist); double genRule(int t, int* L, double* dist); public: //Default Constructor AdaBoost(); //Constructor AdaBoost(T** data, int* labels, int n, int d, int nL); //Train function void train(); //Test function void test(double** data, double* pMap); void test(double** data, double* pMap, int n); int writeToFile(char* fName); int readFromFile(char* fName); //Destructor ~AdaBoost(); }; #endif </code></pre> <p>AdaBoost.cpp</p> <pre><code>#include "AdaBoost.h" #include &lt;fstream&gt; using namespace std; template class AdaBoost&lt;double&gt; ; template&lt;class T&gt; int AdaBoost&lt;T&gt;::readFromFile(char* fName) { ifstream inFile; int temp; int d, dir; float thr, wt; inFile.open(fName); if (!inFile) return 0; inFile &gt;&gt; temp; this-&gt;nL = temp; int k = 0; while (!inFile.eof() &amp;&amp; k &lt; nL) { inFile &gt;&gt; d; inFile &gt;&gt; thr; inFile &gt;&gt; dir; inFile &gt;&gt; wt; k++; } inFile.close(); return 1; } </code></pre> <p>AdaMain.cpp</p> <pre><code>#include "AdaBoost.h" using namespace std; int main(int argc, char** argv) { AdaBoost&lt;double&gt; rdClass; rdClass.readFromFile("Naerer"); return 0; } </code></pre>
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