test.h:

template<typename DATATYPE>
class Test
{
public:
    
    /// @brief Default constructor.
    Test() {};
        
    /// @brief Destructor
    ~Test() {};

    /// @brief test run
    void run(DATATYPE *io, const uint32_t size);

};



test.cpp:
#include "test.h"



template<typename DATATYPE> void Test<DATATYPE>::run(DATATYPE* io, const uint32_t size)
{
    
    return;
}


template<> void Test<int32_t>::run(int32_t* io, const uint32_t size)
{

    return;
}


class Dummy {
    Test<int32_t> ttt[10]; /// 허허허...
};