Re: Inherit from class based on bool value

[Basile B. via Digitalmars-d-learn]

On Tuesday, 13 November 2018 at 07:10:26 UTC, Jamie wrote:

I would like my class to inherit from one of two classes based on a boolean value known at compile time. Something like this:

void main()
{
    Top!(OPTION.FALSE) top = new Top!(OPTION.FALSE);
}

enum OPTION
{
    FALSE = 0.,
    TRUE = 1.
}

class One
{}

class Two
{}

class Top(OPTION option) : option ? One : Two
{}

Is this possible? I can't get it to work in the way I'm showing above.

Cheers

You can use an alias seq :

void main()
{
    Top!(OPTION.FALSE) top = new Top!(OPTION.FALSE);
}

enum OPTION
{
    FALSE = 0,
    TRUE = 1
}

class One
{}

class Two
{}

import std.meta : AliasSeq;
alias Bases = AliasSeq!(One, Two);

class Top(OPTION option) : Bases[option]
{}