Subject: Re: [boost] Phoenix review
From: Mathias Gaunard (mathias.gaunard_at_[hidden])
Date: 2008-09-26 13:24:58
Giovanni Piero Deretta wrote:
> Instead of:
>
> switch_(arg1)
> [
> case_<1>(cout << val("one") << '\n'),
> case_<2>(cout << val("two") << '\n'),
> default_(cout << val("other value") << '\n')
> ]
>
> do this:
>
> switch_(arg1)
> [
> case(1)[cout << val("one") << '\n'],
> case(2)[cout << val("two") << '\n'],
> default_[cout << val("other value"] << '\n')
> ]
>
> this allows not only runtime selection of switch case values, but it
> will also work with everything that is equally comparable:
>
> switch_(arg1)
> [
> case("one")[cout << val(1) << '\n'],
> case("two")[cout << val(2) << '\n'],
> default_[cout << val("other value"] << '\n')
> ]
>
> which IMHO is a killer feature.
In efficiency, you mean?
One dispatch is 0(1) in the number of cases, the other is 0(n).