On 10/24/06, Sohail Somani wrote:

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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]; }

Does it mean that code segment 1 is as fast as segment 2, but code segment 3 is the slowest? ///////1 boost::shared_array a(new int[100]); for(int i = 0; i < 100; ++ i) a.get()[i] = i; ////////2 boost::shared_array a(new int[100]); int a_ptr = a.get(); for(int i = 0; i < 100; ++ i) a_ptr[i] = i; ////////3 boost::shared_array a(new int[100]); for(int i = 0; i < 100; ++ i) a[i] = i;