On Wed, Sep 12, 2018 at 2:55 PM robert engels <reng...@ix.netcom.com> wrote:
> Ok, now the coffee has kicked in, and it still has problems, because you
> cannot call a method and use a return value other than error without
> multiple signatures, unless you move all of the return values outside of
> the closure - like his example does with var a.
>
> This would be extremely tedious (and probably error prone) to use IMO,
> especially with Go’s multiple return values.
>
one has to be careful, yes. but it's not completely out of reach.
func Foo(a, b int) (int, error) { ... }
func Do() {
var out = 0
With(ctx, func() error {
var err error
out, err = Foo(42, 66)
return err
})
}
closures are great! (like fezzes and bowties, actually :P)
-s
>
> On Sep 12, 2018, at 7:50 AM, robert engels <reng...@ix.netcom.com> wrote:
>
> Too early, and the coffee had not kicked in...
>
> On Sep 12, 2018, at 7:49 AM, robert engels <reng...@ix.netcom.com> wrote:
>
> Yes, you are correct. My bad :)
>
> On Sep 12, 2018, at 7:34 AM, Sebastien Binet <bi...@cern.ch> wrote:
>
>
>
> On Wed, Sep 12, 2018 at 2:23 PM robert engels <reng...@ix.netcom.com>
> wrote:
>
>> I am pretty sure that is not correct, I am referring to:
>>
>> func WithContext(context Context, f func() error) error {
>> context.__entry__()
>> defer context.__exit__()
>> return f()
>> }
>>
>>
>> You will need a lot of WithContext methods - based on the different
>> signatures of function f.
>>
>> See the main method… I am assuming this is attempting to be a general
>> facility - and thus the signature of f will vary.
>>
>
> you just need to wrap it with a closure, just as Eric did:
>
> e.g.:
> func QueryDB(a,b int) error { ... }
>
> WithContext(ctx, func() error {
> return QueryDB(42, 666)
> })
>
> and voila.
>
> -s
>
>
>
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