Re: Conpile-Time module constructor

[Paul Backus via Digitalmars-d-learn]

On Sunday, 19 June 2022 at 15:34:48 UTC, Ruby The Roobster wrote:

On 6/19/2022 11:19 AM, Paul Backus wrote:

On Sunday, 19 June 2022 at 14:51:26 UTC, Ruby The Roobster wrote:

Is it possible to make a module constructor run at compile-time?  If so, how?

No, it's not.

What are you trying to accomplish that lead you to ask this question? There is probably a different way to do it without involving module constructors.

What I was trying to accomplish was to change a compile time array whenever a certain module was included. The value of the array needs to be known at compile time.

You can do this with a `static if` check:

    static if (__traits(compiles, { import mymodule; }))
    {
        // mymodule is included
        enum compileTimeArray = ...;
    }
    else
    {
        // mymodule is not included
        enum compileTimeArray = ...;
    }