https://d.puremagic.com/issues/show_bug.cgi?id=11988
[email protected] changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |[email protected] --- Comment #1 from [email protected] 2014-01-24 13:30:21 PST --- (In reply to comment #0) > Often you would want to use the value of the switch statement, but the only > way > to do this is to store the value to a variable first. This has the unfortunate > effect of invading the outer scope: > > ----- > import std.string; > > int get() { return 0; } > > void a(int) { } > void b(int) { } > void c(int) { } > > void main() > { > int v = get(); > switch (v) > { > case 1: a(v); break; > case 2: b(v); break; > case 3: c(v); break; > > default: > assert(0, format("Unhandled case %s", v)); > } > > // problem: v is still visible here > } > ----- > > To avoid invading the outer scope, but at the same time avoiding introduction > of arbitrary language features, it might be useful to introduce another > compiler-reserved symbol "__switch". The above code would then look like: > > ----- > import std.string; > > int get() { return 0; } > > void a(int) { } > void b(int) { } > void c(int) { } > > void main() > { > switch (get()) > { > case 1: a(__switch); break; > case 2: b(__switch); break; > case 3: c(__switch); break; > > default: > assert(0, format("Unhandled case %s", __switch)); > } > } > ----- > > The default diagnostic is where I've encountered a need for this feature, very > frequently too. Why don't we just allow `auto var = <expression>`, like in an if-statement? -- Configure issuemail: https://d.puremagic.com/issues/userprefs.cgi?tab=email ------- You are receiving this mail because: -------
