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

25 Oct 2006


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I have the following two code segments. I'm wondering if
-----Original Message-----
From: boost-users-bounces@lists.boost.org 
[mailto:boost-users-bounces@lists.boost.org] On Behalf Of 
Sohail Somani
there is any
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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];
    }