clang-6和-std = c ++ 17 —无法调用bind（2）

Question

Trying to compile the following code using clang++ version 6.0 with the -std=c++17 flag:

   if (bind(ssock, res->ai_addr, res->ai_addrlen) != 0)
   {
      return -1;
   }

I get the following error:

.../udt4/app/test.cpp:90:51: error: invalid operands
      to binary expression ('__bind<int &, sockaddr *&, unsigned int &>' and
      'int')
   if (bind(ssock, res->ai_addr, res->ai_addrlen) != 0)
       ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ^  ~
/usr/include/c++/v1/system_error:587:1: note: candidate function not viable: no
      known conversion from '__bind<int &, sockaddr *&, unsigned int &>' to
      'const std::__1::error_code' for 1st argument
operator!=(const error_code& __x, const error_code& __y) _NOEXCEPT
....

Somehow, the perfectly standard function bind(2) seems to have gotten redeclared as something returning an error_code instead of the good old int .

What's going on? How do I solve this nicely -- and keep the code compilable with earlier compilers?

Answer 1

You might have using namespace std or similar in your program, in which case the compiler might think you want std::bind .

To refer to the bind you probably really want, you can use ::bind .