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C vs C++

C vs C++

Posted May 20, 2014 19:22 UTC (Tue) by JGR (subscriber, #93631)
In reply to: C vs C++ by MrWim
Parent article: Clasen: Introducing GtkInspector

auto_ptr has nasty and unhelpful copy behaviour which led to it being deprecated, it should be avoided if at all possible IMO.

unique_ptr is generally the most convenient choice; constructing one has zero cost over just returning a pointer to an allocation with new. It's trivial to then move it to a different smart pointer/whatever as necessary, which is much more of a pain with a shared_pointer. Destructing a shared_ptr also uses atomic operations, which is surprisingly expensive.

If you need that level of allocation flexibility and always return a fixed number of (non-polymorphic) object(s), it's usually simpler to just require that the caller pass in a non-const reference to an existing object to fill in.
For the case of 1 object, you could also use a member function or constructor.


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C vs C++

Posted May 21, 2014 14:58 UTC (Wed) by mathstuf (subscriber, #69389) [Link]

Well, the problem with unique_ptr is that you need move constructors for it to be fully useful. And that requires C++11 or using boost::move explicitly. Unfortunately, the list of platforms I need to support limit me to shared_ptr since decorating everything with boost::move would likely cause more bugs when it is forgotten.


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