std::atomic::store can't be called in ctor initialization list

When I was trying to call std::atomic::store in initialization list, I got following compiler error: g++ -std=c++11 test_function_call_in_ctor.cc

test_function_call_in_ctor.cc: In constructor ‘TestA::TestA()’: test_function_call_in_ctor.cc:7:17: error: expected ‘(’ before ‘.’ token TestA() : run_.store(true) { ^ test_function_call_in_ctor.cc:7:17: error: expected ‘{’ before ‘.’ token

source code as below:

class TestA {
  public:
    TestA() : run_.store(true) {
      cout << "TestA()";
      if (run_.load()) {
        cout << "Run == TRUE" << endl;
      }
    }
    ~TestA() {}
  private:
    std::atomic<bool> run_;
};
int main() {
  TestA a;
  return 0;
}

Any idea on this issue? Thanks a lot.