thisExePath purity

[Steven Schveighoffer via Digitalmars-d-learn]

On 9/19/16 8:01 PM, crimaniak wrote:
> Hi!
>
> Is there situations when output of thisExePath() can be different during
> runtime? If yes, what the reason?
> If no, is this possible to mark it as pure in phobos?
>
> https://dlang.org/library/std/file/this_exe_path.html

Not in a way that D can ensure purity. Yes, it will not change. But that 
guarantee is not communicated via the OS functions required to call to 
get the information.

One thing you can do:

immutable string myPath;

shared static this()
{
    import std.file: thisExePath;
    myPath = thisExePath;
}

// now use myPath as required from pure functions.

-Steve