Cast to var

[ekolis]

This would be a shortcut for casting to the type of a variable - for instance

int x = 85;
object y = 42;
x = (var)y;

the cast would be equivalent to (int)y because x is of type int.

[alrz]

This looks like downcast and upcast (a static cast) from F#, both of which are target-typed.

For upcasting, it's recommended to use a helper method

T StaticCast<T, TDerived>(TDerived o) where TDerived : T => o;

But now you need to specify all type arguments. While partial type inference (#1349) could help with that, you could hide TDerived using a static class,

static class StaticCast<T> {
   static T From<TDerived>(TDerived o) where TDerived : T => o;
}

But once we have type inference from target-type (#92) you could use the original method with all type arguments inferred:

x = Cast(y); // Cast<int, object>(y)

which will work for upcasting as well.

[ronnygunawan]

Why not write it even shorter:

x = ()y;

for target-typed explicit cast.

[ekolis]

x = y; ? What is this, VB? ;)

…

On Fri, Sep 27, 2019, 9:08 AM setbbtjl8wwq ***@***.***> wrote: @ronnygunawan <https://github.com/ronnygunawan> or even ;) x = y; — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#2827?email_source=notifications&email_token=AAT52GQAQ3BXNSU5E6DFBCLQLYATLA5CNFSM4I23J7T2YY3PNVWWK3TUL52HS4DFVREXG43VMVBW63LNMVXHJKTDN5WW2ZLOORPWSZGOD7Y2UVI#issuecomment-535931477>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AAT52GQKUBKY7TKK5PKEW3TQLYATLANCNFSM4I23J7TQ> .

[ronnygunawan]

x = y; only works for upcast