Subject: Re: [boost] rvalue ref best practices?
From: Mathias Gaunard (mathias.gaunard_at_[hidden])
Date: 2012-06-11 07:02:52
On 10/06/2012 22:38, Ion GaztaÃ±aga wrote:
> When thinking in solutions to this pass by value/reference issues, I
> feel C++ is missing some language feature so that a function can detect
> (at runtime, avoiding instantiations) if the output parameter is already
An output parameter is never constructed. This is important for
> //RVO is used for all parameters
> //default initialization syntax used
> //inside "function"
> [A a; B b; C c] = function(a, b, c, 0);
Your best bet is probably to use expressions templates so that
tie(a, b) = function(c, 0);
is evaluated as a function that takes inputs and outputs.
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