Ok, thank you for the clarification пт, 27 авг. 2021 г. в 18:18, Axel Wagner <axel.wagner...@googlemail.com>: > > No, it is not possible. The *only* functions that can return either one or > two returns are builtins. > That's because the number of returns is part of the type of a function, so it > is constant for every function. > Builtin "functions", OTOH, are not really functions, in terms of the > language. They are intrinsics of the compiler, which parses the > call-expression and translates them into machine code or calls into the > runtime (which is also how they can be generic, without Go having generics). > You can see that by trying to assign a builtin function to a variable: > https://play.golang.org/p/0EiSIIqSLhp > This would be possible for every function - but `append` has no type, so you > can't put it in a variable (which would need to have the same type as > `append`). > > What you ask is just categorically impossible in Go. > > On Fri, Aug 27, 2021 at 5:06 PM Vasiliy Tolstov <v.tols...@selfip.ru> wrote: >> >> I know, so my question is - does it possible to write such functions >> like builtin? For example I can create func via reflect.... >> >> пт, 27 авг. 2021 г. в 18:03, Levieux Michel <mlevieu...@gmail.com>: >> > >> > Hi, >> > >> > Optional returns and parameters don't exist in go, what you are referring >> > to is built-in behavior specific to some features. >> > >> > A good way to approach what you want is by assigning it to the anonymous >> > '_' var when you don't want the returned bool. >> > >> > Hope this helps >> > >> > Le ven. 27 août 2021 à 16:58, Vasiliy Tolstov <v.tols...@selfip.ru> a >> > écrit : >> >> >> >> Does it possible to have own func that have string, bool return value, >> >> but bool value optional? >> >> Like receiving from channel or get element from map, or like when >> >> casting to some type interface? >> >> >> >> -- >> >> Vasiliy Tolstov, >> >> e-mail: v.tols...@selfip.ru >> >> >> >> -- >> >> You received this message because you are subscribed to the Google Groups >> >> "golang-nuts" group. >> >> To unsubscribe from this group and stop receiving emails from it, send an >> >> email to golang-nuts+unsubscr...@googlegroups.com. >> >> To view this discussion on the web visit >> >> https://groups.google.com/d/msgid/golang-nuts/CACaajQvoPEGMM-KB3uRmibXr_HL_aqz_bb2%3DKT%3DsbQKR4U4Gkw%40mail.gmail.com. >> >> >> >> -- >> Vasiliy Tolstov, >> e-mail: v.tols...@selfip.ru >> >> -- >> You received this message because you are subscribed to the Google Groups >> "golang-nuts" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to golang-nuts+unsubscr...@googlegroups.com. >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/golang-nuts/CACaajQsJ3KeKMStEWvUYtgGnmZMX1gbq_vbt73k6TM2LTkepUA%40mail.gmail.com.
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