[Boost-users] move/copy parameter advice

Subject: [Boost-users] move/copy parameter advice
From: John Dlugosz (JDlugosz_at_[hidden])
Date: 2010-05-11 14:48:54

> If you want or need a primer on the subject, please look at the
> working draft for C++1x.  This linked site has also been shown to be
> quite useful in describing move usefulness:
> 
>   Want Speed? Pass by Value.:
> http://cpp-next.com/archive/2009/08/want-speed-pass-by-value/

> 
>   Move It With Rvalue References:
> http://cpp-next.com/archive/2009/09/move-it-with-rvalue-references/

> 

This article suggests passing by value and letting the compiler make (or omit) the copy.  It also has specific advice on return value behavior: return a local variable, but not a formal parameter (even if you have to swap them). 

But, I recall reading that Boost has conditional code with a lengthy explanation about what optimizes for one compiler is bad for another, and vice versa, and concerned passing const ref (or not).  Is this specific advice more up-to-date with current compilers, or "just his"?

--John

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