On Fri, May 5, 2017 at 12:51 AM, roger peppe <rogpe...@gmail.com> wrote: > On 4 May 2017 at 20:48, Michael Jones <michael.jo...@gmail.com> wrote: >> What is *actually* missing is boolean operators for boolean types. > > Really? We've got !, &&, ||, != (xor), == (xnor). What's missing?
In a sense we are missing & and |, the non-shortcut versions of && and ||. Ian >> On Thu, May 4, 2017 at 12:43 PM, Ian Lance Taylor <i...@golang.org> wrote: >>> >>> On Thu, May 4, 2017 at 9:42 AM, <occi...@esperanto.org> wrote: >>> > >>> > One apparently random omission in C, which was fixed in Perl, is &&= and >>> > ||=: >>> > >>> > a &&= b >>> > a = a && b >>> > a ||= b >>> > a = a || b >>> > >>> > except that a gets evalutated only once (e.g. myarray[f(2)] &&= b) >>> > >>> > Besides being useful, this would make Go more consistent. Of course >>> > relative operators also do not have this, but there usually the result >>> > type >>> > is different (e.g. bool = int < int) >>> >>> The &&= and ||= operators are omitted in both C and Go because they >>> are short-cutting operators. When you write `a = a && b`, then if a >>> is true, b is not evaluated. So presumably when you write `a &&= b` >>> then if a is true b is not evaluated. But it is potentially confusing >>> to see `a &&= f()` when f() may or may not be called. >>> >>> Ian >>> >>> -- >>> 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. >> >> >> >> >> -- >> Michael T. Jones >> michael.jo...@gmail.com >> >> -- >> 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.
