Re: iota result as member variable

[Edwin van Leeuwen via Digitalmars-d-learn]

On Thursday, 24 March 2016 at 06:54:25 UTC, Alex wrote:
Hi everybody,
doing some optimization on my code, I faced some strange 
question:
how to save a iota result in a class member?
Say I have
class A
{
    ??? member;

    auto testIter4()
    {
        return iota(0,5);
    }
}

void main()
{
    A a = new A();
    a.member = testIter4();
}

how would I declare the member?


Yeah this is one of the downsides of voldermort types. In these 
cases typeof and ReturnType are your friend. It often takes me a 
couple of tries to get it right, but the following seems to work:

import std.traits : ReturnType;
import std.range : iota;
class A
{
    ReturnType!(A.testIter4) member;
    auto testIter4()
    {
        return iota(0,5);
    }
}

void main()
{

     A a = new A();
     a.member = a.testIter4();
        
}