An ambiguous call to the std :: atomic function using clang

Question

I am trying to compile my code with clang, previously I used g ++.

I get errors compiling the following code:

#include <atomic>

typedef void (*my_func) ();
int main(int argc, char** argv)
{
  std::atomic<my_func> _func;
  _func();
  return 0;
}

Mistake:

a.cpp:23:3: error: call to object of type 'std::atomic<my_func>' is ambiguous
  _func();
  ^~~~~
/usr/bin/../lib/gcc/x86_64-linux-gnu/4.8/../../../../include/c++/4.8/atomic:304:7: note: conversion candidate of type 'void (*)()'
      operator __pointer_type() const noexcept
      ^
/usr/bin/../lib/gcc/x86_64-linux-gnu/4.8/../../../../include/c++/4.8/atomic:307:7: note: conversion candidate of type 'void (*)()'
      operator __pointer_type() const volatile noexcept
      ^
1 error generated.

This is not my code, this is legacy code that I need to use. In real code, _func is a member of the class and has a setter and getter, and as I understand it, it intends to protect it so that it does not change when it intends to call it.

Edit: I am using clang3.6 (same error for clang3.7) and g ++ and std :: atomic 4.8.

Answer 1

If the question "how to compile code on CLang", the answer is simple:

#include <atomic>

typedef void (*my_func) (int );
int main()
{
  std::atomic<my_func> _func;
  (*_func)(42);
  return 0;
}

operator(), - . , _func volatile: volatile std::atomic<my_func> _func;, .

Answer 2

, - _func.load()();. , .

MS Visual ++. , .