On Wed, Mar 7, 2018 at 1:36 PM, <d...@veryhaha.com> wrote: > > On Wednesday, March 7, 2018 at 4:26:19 PM UTC-5, di...@veryhaha.com wrote: >> >> get it almost. >> >> But I feel >> >> var v = float32(1<<s) >> is a little different to >> var v float32 = 1<<s >> >> >> For the former one, we think "1" can be assumed as an "int". >> But anyway, I get the main point of the design. >> It is just a wording accuracy problem. >> > > On the other hand, any bad if "1" is deduced as an "int" value?
If we ignore the type context, then var v int64 = 1 << s fails on 32-bit systems if s > 31 (because 1 is assigned type int, which is 32 bits, and the shifting a 32-bit value by more than 31 bits gives you zero). If we don't ignore the type context, then in var v float32 = 1 << s fails because we can't shift a float32. We could ignore the type context for float types but not for integer types, but then the rule is even more complicated. Ian >> On Wednesday, March 7, 2018 at 3:59:48 PM UTC-5, Ian Lance Taylor wrote: >>> >>> On Wed, Mar 7, 2018 at 12:54 PM, Volker Dobler >>> <dr.volke...@gmail.com> wrote: >>> > Looks suspicious. Without crosschecking the Spec: Might be >>> > a bug. File an issue? >>> >>> It's not a bug. See Andrey's reply. >>> >>> Ian >>> >>> >>> >>> > On Wednesday, 7 March 2018 21:39:32 UTC+1, di...@veryhaha.com wrote: >>> >> >>> >> var s uint = 33 >>> >> var u2 = float64(1>>s) // illegal: 1 has type float64, cannot shift >>> > >>> > -- >>> > 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...@googlegroups.com. >>> > For more options, visit https://groups.google.com/d/optout. > > -- > 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. > For more options, visit https://groups.google.com/d/optout. -- 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. For more options, visit https://groups.google.com/d/optout.
