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POc++ templated class does not link
 

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    <pre><code>template&lt;typename AT&gt; class growVector { int size; AT **arr; AT* defaultVal; public: growVector(int size , AT* defaultVal); //Expects number of elements (5) and default value (NULL) AT*&amp; operator[](unsigned pos); int length(); void reset(int pos); //Resets an element to default value void reset(); //Resets all elements to default value ~growVector(); }; </code></pre> <p>and .cpp is</p> <pre><code>template&lt;typename AT&gt; growVector&lt;AT&gt;::growVector(int size, AT* defaultVal) { arr = new AT*[size]; this-&gt;size = size; for (int i = 0 ; i &lt; size; i++){ arr[i] = defaultVal; } } template&lt;typename AT&gt; AT*&amp; growVector&lt;AT&gt;::operator [](unsigned pos){ if (pos &gt;= size){ int newSize = size*2; AT** newArr = new AT*[newSize]; memcpy(newArr, arr, sizeof(AT)*size); for (int i = size; i&lt;newSize; i++) newArr[i] = defaultVal; size = newSize; delete arr; arr = newArr; } return arr[pos]; } //template&lt;typename AT&gt; //const AT*&amp; growVector&lt;AT&gt;::operator [](unsigned pos) const{ // if (pos &gt;= size) // throw std::range_error("index out of range in constant vector"); // } // return NULL; //} template&lt;typename AT&gt; int growVector&lt;AT&gt;::length(){ return size; } template&lt;typename AT&gt; growVector&lt;AT&gt;::~growVector(){ delete arr; } template&lt;typename AT&gt; void growVector&lt;AT&gt;::reset(int pos){ if (pos&gt;=size) throw new std::range_error("index out of bounds"); arr[pos] = defaultVal; } template&lt;typename AT&gt; void growVector&lt;AT&gt;::reset(){ for (int pos = 0; pos&lt;size; pos++) arr[pos] = defaultVal; } </code></pre> <p>...very basic.</p> <p>I use it in </p> <pre><code>int main() { growVector&lt;char&gt; gv(5, (char*)NULL); char* x = NULL; for (int i = 0; i&lt; 50; i++){ gv[i] = x; } gv.reset(); return 0; } </code></pre> <p>it compiles but the linker says:</p> <pre><code>Invoking: GCC C++ Linker g++ -pthread -o"base" ./src/base.o ./src/base/baseController.o ./src/base/baseThreads.o ./src/base/utils.o ./src/base/utils/utilClasses.o ./src/base.o: In function `main': /home/dario/workspace/base/Debug/../src/base.cpp:95: undefined reference to `baseUtils::growVector&lt;char&gt;::growVector(int, char*)' /home/dario/workspace/base/Debug/../src/base.cpp:98: undefined reference to `baseUtils::growVector&lt;char&gt;::operator[](unsigned int)' /home/dario/workspace/base/Debug/../src/base.cpp:100: undefined reference to `baseUtils::growVector&lt;char&gt;::reset()' /home/dario/workspace/base/Debug/../src/base.cpp:101: undefined reference to `baseUtils::growVector&lt;char&gt;::~growVector()' /home/dario/workspace/base/Debug/../src/base.cpp:101: undefined reference to `baseUtils::growVector&lt;char&gt;::~growVector()' collect2: ld returned 1 exit status </code></pre> <p>I'm really clueless</p>
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    1. CODupe? http://stackoverflow.com/questions/1724036/splitting-templated-c-classes-into-hpp-cpp-files-is-it-possible/1724265#1724265
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