struct IParameterAccessor
{
...
};

template <size_t i>
class test
{
public:
typedef std::pair < std::string, IParameterAccessor* >  TParamPair;

void func(const char* s, IParameterAccessor* a)
{
// *** compile error thrown in this line:
TParamPair p(std::string(s), a);

/* BUT: The following commented line works: */
//   std::pair<std::string, IParameterAccessor*> p(std::string(s), a);
/* AND: The next commented lines works as well: */
//   TParamPair p;
//   p.first = std::string(s);
//   p.second = p;
}
};