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copied!<p>The problem is most likely in the fact that you relegated the specializations of your member function <code>runFFT()</code> for <code>int16_t</code> and <code>Ipp32f</code> in a separate <code>.cpp</code> file without providing a corresponding declaration after the primary template, so the compiler at the point of instantiation (which likely belongs to another translation unit that <code>#include</code>s only the header file containing the definition of <code>Client</code>) doesn't know about the existence of those explicit specializations.</p> <p>Put a <em>declaration</em> for those specializations in the same header file that contains the definition of your class template:</p> <pre><code>template<typename T> inline void UnusedParameter( T const& ) { } class Client { public: template<class T> void runFFT(T *wSamples, float const &fMult) { std::cout << "INSIDE RUNFFT : : :" << std::endl; UnusedParameter(wSamples); UnusedParameter(fMult); } }; // DECLARE YOUR EXPLICIT SPECIALIZATIONS HERE template<> void Client::runFFT<int16_t>(int16_t *wSamples, float const &fMult); template<> void Client::runFFT<Ipp32f>(Ipp32f *wSamples, float const &fMult); </code></pre> <p>Per Paragraph 14.7.3/6 of the C++11 Standard:</p> <blockquote> <p>If a template, a member template or a <strong>member of a class template</strong> is explicitly specialized then that specialization shall be <strong>declared before the first use of that specialization that would cause an implicit instantiation to take place</strong>, in every translation unit in which such a use occurs; <strong>no diagnostic is required</strong>. [...]</p> </blockquote> <p>The "<em>no diagnostic is required</em>" part means that if you don't follow this rule, your program will be ill-formed, but your compiler/linker is not required to tell you. This normally results in the kind of undefined behavior you are observing.</p>

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