[Issue 23094] New: std.range.generate calls fun more than necessary
d-bugmail at puremagic.com
d-bugmail at puremagic.com
Thu May 5 19:51:47 UTC 2022
https://issues.dlang.org/show_bug.cgi?id=23094
Issue ID: 23094
Summary: std.range.generate calls fun more than necessary
Product: D
Version: D2
Hardware: x86_64
OS: Linux
Status: NEW
Severity: normal
Priority: P1
Component: phobos
Assignee: nobody at puremagic.com
Reporter: remi.thebault at outlook.com
The following unit test fails (i == 2):
unittest
{
import std.array;
import std.random;
import std.range;
int someFun()
{
return uniform(0, 2000);
}
int i = 0;
const arr = generate!(() {
++i;
return someFun();
}).take(1).array;
assert(arr.length == 1);
assert(i == 1, "generate called fun more than once");
}
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