Hi,

Is it possible to retrieve the calling expression of a function ? Something like that

---
import std.stdio;

void funcTest(int x, float y)
{
  writefln(get_call());
}

void main()
{
  float x = 0.2;
  funcTest(1+2, x+2);
}
---

output expected : " funcTest(1+2, x+2) "

Thanks

On Saturday, 28 November 2015 at 15:02:32 UTC, Quentin Ladeveze wrote:
> Hi,
>
> Is it possible to retrieve the calling expression of a function ? Something like that
>
> ---
> import std.stdio;
>
> void funcTest(int x, float y)
> {
>   writefln(get_call());
> }
>
> void main()
> {
>   float x = 0.2;
>   funcTest(1+2, x+2);
> }
> ---
>
> output expected : " funcTest(1+2, x+2) "
>
> Thanks

I do not have right now to provide you with code, but three things:

1. Use of mixin,
2. The function call to be written in a string,
3. A wrapper that stores given function call string, saves it, and mixin it.

On Saturday, 28 November 2015 at 15:22:51 UTC, tcak wrote:
> On Saturday, 28 November 2015 at 15:02:32 UTC, Quentin Ladeveze wrote:
>> Hi,
>>
>> Is it possible to retrieve the calling expression of a function ? Something like that
>>
>> ---
>> import std.stdio;
>>
>> void funcTest(int x, float y)
>> {
>>   writefln(get_call());
>> }
>>
>> void main()
>> {
>>   float x = 0.2;
>>   funcTest(1+2, x+2);
>> }
>> ---
>>
>> output expected : " funcTest(1+2, x+2) "
>>
>> Thanks
>
> I do not have right now to provide you with code, but three things:
>
> 1. Use of mixin,
> 2. The function call to be written in a string,
> 3. A wrapper that stores given function call string, saves it, and mixin it.

Thanks, it was a cool idea, I made something that works, but you can only call the function with literals, not with variables :

---

import std.stdio;

void main()
{
	int x = 2;

	enum call = "funcTest(1, 0.2);";
 	callPrinter!call;
}

template callPrinter(string call)
{
	void callPrinter()
	{
		writeln(call);
		mixin(call);
	}
}

void funcTest(int x, float y)
{
	writeln("called with ", x, " and ", y);
}

---

output :
funcTest(2, 0.2);
called with 2 and 0.2

On Saturday, 28 November 2015 at 15:41:59 UTC, Quentin Ladeveze wrote:
> On Saturday, 28 November 2015 at 15:22:51 UTC, tcak wrote:
>> On Saturday, 28 November 2015 at 15:02:32 UTC, Quentin Ladeveze wrote:
>>> Hi,
>>>
>>> Is it possible to retrieve the calling expression of a function ? Something like that
>>>
>>> ---
>>> import std.stdio;
>>>
>>> void funcTest(int x, float y)
>>> {
>>>   writefln(get_call());
>>> }
>>>
>>> void main()
>>> {
>>>   float x = 0.2;
>>>   funcTest(1+2, x+2);
>>> }
>>> ---
>>>
>>> output expected : " funcTest(1+2, x+2) "
>>>
>>> Thanks
>>
>> I do not have right now to provide you with code, but three things:
>>
>> 1. Use of mixin,
>> 2. The function call to be written in a string,
>> 3. A wrapper that stores given function call string, saves it, and mixin it.
>
> Thanks, it was a cool idea, I made something that works, but you can only call the function with literals, not with variables :
>
> ---
>
> import std.stdio;
>
> void main()
> {
> 	int x = 2;
>
> 	enum call = "funcTest(1, 0.2);";
>  	callPrinter!call;
> }
>
> template callPrinter(string call)
> {
> 	void callPrinter()
> 	{
> 		writeln(call);
> 		mixin(call);
> 	}
> }
>
> void funcTest(int x, float y)
> {
> 	writeln("called with ", x, " and ", y);
> }
>
> ---
>
> output :
> funcTest(2, 0.2);
> called with 2 and 0.2

mixin template could solve this problem as well I guess. It would, instead of calling a function, directly inject the code into where you call it. So, remove the callPrinter function, make template a mixin template, and in main, call it like mixin callPrinter!"...";

On Saturday, 28 November 2015 at 17:19:40 UTC, tcak wrote:
> On Saturday, 28 November 2015 at 15:41:59 UTC, Quentin Ladeveze wrote:
>> [...]
>
> mixin template could solve this problem as well I guess. It would, instead of calling a function, directly inject the code into where you call it. So, remove the callPrinter function, make template a mixin template, and in main, call it like mixin callPrinter!"...";

I don't think mixin templates would work here. The reference says that we can only do declarations in a mixin template.