Re: [Boost-users] Does shared_array's get() method introduceruntimeoverhead?

From: Sohail Somani (s.somani_at_[hidden])
Date: 2006-10-24 20:01:53

> -----Original Message-----
> From: boost-users-bounces_at_[hidden] 
> [mailto:boost-users-bounces_at_[hidden]] On Behalf Of 
> Sohail Somani
> > I have the following two code segments. I'm wondering if 
> there is any
> > run time overhead of the get() method. Shall I use the latter one
> > instead of the former one?
> > 
> > 
> > 
> > boost::shared_array a(new int[100]);
> > for(int i = 0; i < 100; ++ i)
> >   a[i] = i;
> > 
> > 
> > 
> > boost::shared_array a(new int[100]);
> > int a_ptr = a.get();
> > for(int i = 0; i < 100; ++ i)
> >   a_ptr[i] = i;
> 
> I'd guess not (from shared_array.hpp):
> 
> template<class T> class shared_array
> {
> ...
>     T * get() const // never throws
>     {
>         return px;
>     }
> ...
> 
> Unless that doesn't get inlined of course.
> 
[snip smart-ass comment]

Argh, of course I meant to paste: 

   T & operator[] (std::ptrdiff_t i) const // never throws
    {
        BOOST_ASSERT(px != 0);
        BOOST_ASSERT(i >= 0);
        return px[i];
    }