On Saturday, 25 January 2020 at 08:59:23 UTC, Basile B. wrote:
On Saturday, 25 January 2020 at 08:35:18 UTC, mark wrote:
I have this code:
import std.random;
import std.stdio;
void main()
{
auto aa = ["one": 1, "two": 2, "three": 3];
writeln(aa);
auto rnd = rndGen;
auto word = aa.byKey.choice(rnd);
writeln(word);
}
And in the D playground it gives this error:
[snip]
I am treating aa as a set and want to pick a random word from
it.
What am I doing wrong?
I'm sorry I can't give a link to this code in the D playground
but the URL in the web browser is just https://run.dlang.io/
and when I click Shorten to get a URL nothing seems to happen
(using Firefox on Linux).
rndGen is a range.
Use `auto word = aa.byKey.choice(rnd.front())` as index instead.
Then `rndGen.popFront()` to advance.
I tried that. It doesn't solve the problem but does reduce the
size of the error output to:
onlineapp.d(9): Error: template std.random.choice cannot deduce
function from argument types !()(Result, uint), candidates are:
/dlang/dmd/linux/bin64/../../src/phobos/std/random.d(2599):
choice(Range, RandomGen = Random)(auto ref Range range, ref
RandomGen urng)
/dlang/dmd/linux/bin64/../../src/phobos/std/random.d(2609):
choice(Range)(auto ref Range range)
