How to create a C++ function that can take argment of both char* and wchar_t*

Source.
Create a traits class that is used as specialized template. Specialize it for char and wchar_t. Generic template is not defined because this function is only for char and wchar_t.

#include 
#include 

template struct kansuu_traits;
template struct kansuu_traits
{
 static FILE* open(const char* p)
 {
  return fopen(p, "r");
 }
};
template struct kansuu_traits
{
 static FILE* open(const wchar_t* p)
 {
  return _wfopen(p, L"r");
 }
};

template void kansuu(const cT* p)
{
 FILE* f = kansuu_traits::open(p);
 fclose(f);
}

int main(int argc, char* argv[]){
 kansuu(L"C:\\TEST\\Text.txt");
 kansuu("C:\\TEST\\Text.txt");
 
 return 0;
}