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    #include <iostream>
 
 
    class test {
    public:
 
      template<typename T>
      friend test& operator&(test& so, T const& t);
    };
 
    template<typename T>
    inline test& operator&(test& so, T const& t) {
        std::cout << "is_pointer        : " << std::is_pointer<T>::value << std::endl;
        static_assert(std::is_pointer<T>::value, "no operator overloaded for pointers.");
 
        // some stuff
        return so;
      }
 
    int main() {
      test t;
      t & 123;
      return 0;
    }

prog.cpp: In instantiation of ‘test& operator&(test&, const T&) [with T = int]’:
prog.cpp:22:11:   required from here
prog.cpp:14:9: error: static assertion failed: no operator overloaded for pointers.
         static_assert(std::is_pointer<T>::value, "no operator overloaded for pointers.");
         ^

Standard output is empty