Re: [Boost-users] Pointer in function parameter?

Meryl Silverburgh wrote:

On 5/8/07, Nat Goodspeed wrote:

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-----Original Message----- From: boost-users-bounces@lists.boost.org [mailto:boost-users- bounces@lists.boost.org] On Behalf Of Meryl Silverburgh Sent: Tuesday, May 08, 2007 9:32 AM To: boost-users@lists.boost.org Subject: [Boost-users] Pointer in function parameter?

vector< boost::shared_ptr<A> > aVector;

aFunc(aVector[0]) ; // just call a

My question is should I change the function parameter of aFuncion from this:

void aFunc(A* aPtr) { // access aPtr }

to this:

void aFunc(shared_ptr<A> aPtr) { // access aPtr }

[Nat] Looks reasonable to me... I believe the docs say that it's conventional to pass shared_ptr by value rather than (e.g.) const reference so that the ref count will be adjusted properly.

Thanks. But what if I have

void aFunc(const A* aPtr) { // access aPtr }

should I change it to

void aFunc(const shared_ptr<A> aPtr) { // access aPtr } Hi,

I would say: Yes, you should change it to the 2nd variant, BUT sometimes the first variant is also ok. You could use the 1st variant, but you will loose your benefit from shared_ptr<>. You have to gurantee that the shared_ptr<> is not destroyed while you are running aFunc(). So use the 2nd variant and choose the safe way. I hope it is a little more clear to you now! Much fun Manuel Jung

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