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#include <iostream>
 
template <typename T>
inline void pushstring(T str);
 
template <int N>
inline void pushstring(const char (&str) [N])
{
   std::cout << N << std::endl;
}
 
template <>
inline void pushstring(const char *str)
{
   std::cout << str << std::endl;
}
 
int main()
{
  const char *x = "Hello?";
  pushstring(1);
  pushstring(x);
  pushstring("Hi");
}

prog.cpp:4: warning: inline function ‘void pushstring(T) [with T = int]’ used but never defined
/home/JK0jhI/ccIBVpIg.o: In function `main':
prog.cpp:(.text+0x4d): undefined reference to `void pushstring<int>(int)'
collect2: ld returned 1 exit status

Standard output is empty