[Boost-users] [shared_ptr] Two basic questions

From: Matthias Kaeppler (noreply_at_[hidden])
Date: 2005-10-13 03:16:06

Hello,

I have two questions regarding the proper use of boost::shared_ptr; both 
actually arose after reading 
http://www.boost.org/libs/smart_ptr/example/shared_ptr_example.cpp

1. In order for some class to work with std::set, you have to supply an 
operator with "less than" semantics. Why are you instead declaring a 
"greater than" operator?

2. In your examples, sometimes you're passing a shared_ptr by value, and 
sometimes by reference-to-const. Which is the better practice? Usually, 
common pointers are passed by value, but since in shared_ptr a reference 
counting mechanism keeps track of the copies, maybe it's better to pass 
it by reference whenever possible?

Thanks in advance,
Matthias Kaeppler

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