Re: [Boost-users] [Asio]Question about error_code when socket::close

Subject: Re: [Boost-users] [Asio]Question about error_code when socket::close
From: Comet (cometliao_at_[hidden])
Date: 2010-05-17 06:53:50

>  void Read() {
>    // this line is very slow, 
>    // because
boost::bind(&Session::HandleRead,shared_from_this(), ...)
>    // causes extra new/delete operations

My test result:
---------------------------------- raw ptr version
------------------------
a.cc:
class A 
{   
 public:
  void f() {}
};

int main() {
  A a;
  boost::function<void ()> f;
  for (size_t i = 0; i < 100000000; ++i) {
    f = boost::bind(&A::f, &a);
  }
}

gcc a.cc -O2
time ./a.out

real    0m1.235s
user    0m1.232s
sys     0m0.000s

------------------------------------ shared_ptr version
----------------------
a.cc:
class A 
{
 public:
  static void f(boost::weak_ptr<A>) {}
};

int main() {
  boost::shared_ptr<A> a = boost::make_shared<A>();
  boost::function<void ()> f;
  for (size_t i = 0; i < 100000000; ++i) {
    f = boost::bind(&A::f, a); 
  }
}

gcc a.cc -O2
time ./a.out

real    0m25.925s
user    0m25.898s
sys     0m0.000s