• DlangLearner (22/22) Nov 10 2015 Here is what I want to know: when a function is called, does this
• Gary Willoughby (12/13) Nov 10 2015 If i understand you, you could use a templated function:
• DLangLearner (4/18) Nov 10 2015 This is what I want. Thank you so much, this is a really elegant

DlangLearner <Bystander gmail.com> writes:

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.

Gary Willoughby <dev nomad.so> writes:

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);
}

DLangLearner <DeepBlueParticle gmail.com> writes:

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.