On 2 July 2013 20:27, Paolo Carlini wrote: > > > Hi, > >>Second, making it `const` enables more potential compiler >>optimizations. > > Stylistically, we already discussed this in the past and the outcome was that > normally we don't use const by value anywhere. But personally I don't have a > strong opinion and certainly I would not object if it makes a difference from > the optimization point of view: as far as I know it does *not*, like it does > not declaring const a local, do you have some up to date evidence that it > does?
It doesn't make any difference. The compiler knows that the object isn't modified and is a function parameter so cannot be aliased, so making it const makes no difference at all.
