Re: Detecting memfun staticness

Greg Herlihy <>
Wed, 3 Sep 2008 02:36:16 CST
On Sep 1, 3:04 pm, Joaqu?n M L?pez Mu?oz <> wrote:

On 1 sep, 21:39, Greg Herlihy <> wrote:

To avoid the overhead of initializing a "T" object each time
call_f<T>() is invoked, simply have the T object declared inside
call_f() - be static as well:

    template <class T>
    void call_f(int x)
         static T t;


The problem is that the compiler does not optimize
the singleton<T>::get() call away when T::f is static because
obtaining the singleton reference has side effects, namely the
creation of t the first time get() is called. The translation
of your proposal to this scenario:

   template <class T>
   void call_f(int x)
     T& t=singleton<T>::get();

is also suboptimal because the *presence* of a static local incurs
an execution overhead every time call_f is invoked, precisely
for the same reason as above, first-time-creation code must be
executed on every call_f invocation.

The call to singleton<T>::get() will be executed only once - if the T&
reference variable inside call_f() is declared static as well:

     template <class T>
     void call_f(int x)
         static T& t = singleton<T>::get();



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