How about a std::map<T, std::function(...)> and a function that finds a
match to a given key and executes the value for the key?

Ray Gardener


On Sun, Feb 26, 2023 at 11:39 PM Sebastian Wittmeier via Std-Proposals <
std-proposals_at_[hidden]> wrote:

> Or
>
>
>
> (3) Depending on the possible values of the string variable use a fast
> hashing that has no collisions.
>
>
>
>
> For strings you probably want to compare not only for equalness, but at
> least
>
> * case insensitive
>
> * ignoring white sace
>
> * starts with prefix
>
> * Unicode aware (different Unicode variants that lead to the same result)
>
> * or even full blown regular expressions.
>
>
>
> Should all those be also included into switch?
>
>
>
> Then the advanced switch is more like a replacement for chained if else
> cascades.
>
>
>
> Best,
>
> Sebastian
>
>
>
> -----Ursprüngliche Nachricht-----
> *Von:* Frederick Virchanza Gotham via Std-Proposals <
> std-proposals_at_[hidden]>
> *Gesendet:* Mo 27.02.2023 01:04
> *Betreff:* Re: [std-proposals] Switch on strings
> *An:* std-proposals_at_[hidden];
> *CC:* Frederick Virchanza Gotham <cauldwell.thomas_at_[hidden]>;
>
> On Sun, Feb 26, 2023 at 11:06 PM Breno Guimarães <brenorg_at_[hidden]>
> wrote:
> >
> > Oops: https://godbolt.org/z/r8Mvaaevf
>
>
> The solution to collisions is one of the following:
>
> (1) Use a better hash algorithm that won't collide
> (2) After the hash matches, use the equality operator to be sure
>
> But if you're going to use the equality operator at all then you could
> get rid of the hashing altogether -- unless you want to keep it in
> there for speed.
> --
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