Here is what I want to know: when a function is called, does this function can recovery the information about which variables pass their values into this function's arguments. I use the following example to show what I want to know.

void main(){
	int a = 1;
	writeln(fun(a.stringof, a));
}

//to return "a is assigned to 1"
string fun(string name, int x)
	return name~" is assigned to "~x;
}

For this example my question turns to become: can the name for fun be derived instead of passing to it?

string fun(int x)
	//is there any way we can know that this value x is passed from the variable a in the main function?
	string name = the name of the variable which passes its value to x	
	return name~" is assigned to "~x;
}

Please enlighten me if this can be done, thanks.

On Tuesday, 10 November 2015 at 14:14:33 UTC, DlangLearner wrote:
> Please enlighten me if this can be done, thanks.

If i understand you, you could use a templated function:

import std.stdio;

void foo(alias a)()
{
    writefln("%s was passed in.", a.stringof);
}

void main(string[] args)
{
    auto bar = "bar";
    foo!(bar);
}

On Tuesday, 10 November 2015 at 14:22:49 UTC, Gary Willoughby wrote:
> On Tuesday, 10 November 2015 at 14:14:33 UTC, DlangLearner wrote:
>> Please enlighten me if this can be done, thanks.
>
> If i understand you, you could use a templated function:
>
> import std.stdio;
>
> void foo(alias a)()
> {
>     writefln("%s was passed in.", a.stringof);
> }
>
> void main(string[] args)
> {
>     auto bar = "bar";
>     foo!(bar);
> }

This is what I want. Thank you so much, this is a really elegant solution.