On 9/3/22 8:09 AM, Salih Dincer wrote:
Hi All,
We discovered a bug yesterday and reported it:
https://forum.dlang.org/thread/mailman.1386.1662137084.31357.digitalmars-d-b...@puremagic.com
You know, there is `generate()` depend to `std.range`. It created the
error when we use it with the value of an enum. Which get their values
from an `enum DNA`, we have 4 members that we want to generate 32 pieces
randomly like this:
```d
import std;
void main()
{
enum DNA { timin = 84,
sitozin = 67,
guanin = 71,
adenin = 65
}
char[] gene;
enum n = 32;
auto range = generate!(() => uniform(DNA.min, DNA.max)).take(n);/*
auto preferred = generate!(() =>
uniform!"[]"(DNA.min,
DNA.max)).take(n);//*/
I'm not sure why this doesn't work. First, I would change your enum to
this (for correctness and readability):
```d
enum DNA : char { timin = 'T',
sitozin = 'C',
guanin = 'G',
adenin = 'A'
}
```
There is probably a bug in generate when the element type is an `enum`
which somehow makes it const. But what you need anyway is a `char`, so
just return a `char`. For that, you need to specify the return type,
which requires a different kind of function literal:
```d
auto preferred = generate!(function char() =>
uniform!"[]"(DNA.min,
DNA.max)).take(n);
```
That works.
-Steve
