Re: hidden passing of __FILE__ and __LINE__ into function

[Basile B. via Digitalmars-d-learn]

On Monday, 17 April 2017 at 10:22:47 UTC, Dmitry wrote:
Hi there.
Currently for messages about errors I use code like this:

    void add(string name, ref Scene scene)
    {
        if (name in listOfScenes)
        {
            EError(__FILE__, __LINE__, "scene already 
exists".L, quoted(name));
        }
    ...
    }

Is there way for avoid using (avoid writing) `__FILE__` and 
`__LINE__` in each call? I.e. I want use simple

    EError("scene already exists".L, quoted(name));

but function `EError` must print info (file and line) of where 
was called.

P.S. `EError` just prints info into console, result for this 
example is:

[Error] (source\core\EScene.d, 35) Scene already exists: 
"Scene 1"

and code is:

    void EError(S...)(S args)
    {
        write("[Error] (", args[0], ", ", args[1], ") ", 
args[2..$], '\n');}
    }

when used as template value parameter, __FILE__ and 
__LINE__evaluate to the file and line of the call site. So help 
yourself ans use something like this:

void error(string f = __FILE__, int l = __LINE__)(string msg){}