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 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 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
