digitalmars.D - Get name of alias parameter at compile time?

dsimcha (8/8) Oct 13 2009 Is there a way to get the name of an alias parameter at compile time? F...

Jacob Carlborg (2/10) Oct 14 2009 Do you want that to print "fun" instead of "doStuff"?
dsimcha (2/15) Oct 15 2009 No, the whole point is that I want to print "doStuff".

Denis Koroskin (13/29) Oct 15 2009 What's the big deal?

Lutger (18/56) Oct 15 2009 I was a bit surprised too since the code dsimcha posted did exactly that...

dsimcha (4/60) Oct 15 2009 Yeah, now that I look into it further, what you describe is exactly the ...

Lutger (13/18) Oct 15 2009 See my reply to my reply (sorry!) for a better way to make it work.

Jacob Carlborg (2/20) Oct 15 2009 See my reply to dsimcha

Jacob Carlborg (5/65) Oct 15 2009 Oh, that problem. Just use a function pointer and get the name of that

Lutger (6/11) Oct 15 2009 Right, good to know LDC does get it right.

Lutger (7/7) Oct 15 2009 Bah, I replied too soon. These also work, makes sense now I think about ...

dsimcha <dsimcha yahoo.com> writes:

Is there a way to get the name of an alias parameter at compile time?  For
example:

void doStuff() {
    // Do stuff.
}

void templ(alias fun)() {
   writeln(fun.stringof);  // Prints doStuff.
}

Oct 13 2009

Jacob Carlborg <doob me.com> writes:

On 10/14/09 06:36, dsimcha wrote:
 Is there a way to get the name of an alias parameter at compile time?  For
 example:

 void doStuff() {
      // Do stuff.
 }

 void templ(alias fun)() {
     writeln(fun.stringof);  // Prints doStuff.
 }

Do you want that to print "fun" instead of "doStuff"?

Oct 14 2009

dsimcha <dsimcha yahoo.com> writes:

Jacob Carlborg Wrote:

 On 10/14/09 06:36, dsimcha wrote:
 Is there a way to get the name of an alias parameter at compile time?  For
 example:

 void doStuff() {
      // Do stuff.
 }

 void templ(alias fun)() {
     writeln(fun.stringof);  // Prints doStuff.
 }

 
 Do you want that to print "fun" instead of "doStuff"?

No, the whole point is that I want to print "doStuff".

Oct 15 2009

"Denis Koroskin" <2korden gmail.com> writes:

On Thu, 15 Oct 2009 18:22:37 +0400, dsimcha <dsimcha yahoo.com> wrote:

 Jacob Carlborg Wrote:

 On 10/14/09 06:36, dsimcha wrote:
 Is there a way to get the name of an alias parameter at compile  

 time?  For
 example:

 void doStuff() {
      // Do stuff.
 }

 void templ(alias fun)() {
     writeln(fun.stringof);  // Prints doStuff.
 }

 Do you want that to print "fun" instead of "doStuff"?

 No, the whole point is that I want to print "doStuff".

What's the big deal?

import std.stdio;

void doStuff() {
}

void templ(alias fun)() {
     writeln(fun.stringof);   // prints "main()"
}

void main()
{
     templ!(main);
}

Works for both D1 and D2

Oct 15 2009

Lutger <lutger.blijdestijn gmail.com> writes:

Denis Koroskin wrote:

 On Thu, 15 Oct 2009 18:22:37 +0400, dsimcha <dsimcha yahoo.com> wrote:
 
 Jacob Carlborg Wrote:

 On 10/14/09 06:36, dsimcha wrote:
 Is there a way to get the name of an alias parameter at compile

 time?  For
 example:

 void doStuff() {
      // Do stuff.
 }

 void templ(alias fun)() {
     writeln(fun.stringof);  // Prints doStuff.
 }

 Do you want that to print "fun" instead of "doStuff"?

 No, the whole point is that I want to print "doStuff".

 
 What's the big deal?
 
 import std.stdio;
 
 void doStuff() {
 }
 
 void templ(alias fun)() {
      writeln(fun.stringof);   // prints "main()"
 }
 
 void main()
 {
      templ!(main);
 }
 
 Works for both D1 and D2

I was a bit surprised too since the code dsimcha posted did exactly that. 
However, change void doStuff() to void doStuff(int a) and you got an error.

I remembered hacking around that one, if anybody knows how to do it better 
it would be good to know:

void doStuff(int a)
{
// Do stuff.
}

void templ(T...)()
    if (T.length==1)
{
    writeln( T.stringof[6..$-1] );
}

void main()
{
    templ!doStuff();
}

Oct 15 2009

dsimcha <dsimcha jhmi.edu> writes:

== Quote from Lutger (lutger.blijdestijn gmail.com)'s article
 Denis Koroskin wrote:
 On Thu, 15 Oct 2009 18:22:37 +0400, dsimcha <dsimcha yahoo.com> wrote:

 Jacob Carlborg Wrote:

 On 10/14/09 06:36, dsimcha wrote:
 Is there a way to get the name of an alias parameter at compile

 time?  For
 example:

 void doStuff() {
      // Do stuff.
 }

 void templ(alias fun)() {
     writeln(fun.stringof);  // Prints doStuff.
 }

 Do you want that to print "fun" instead of "doStuff"?

 No, the whole point is that I want to print "doStuff".

 What's the big deal?

 import std.stdio;

 void doStuff() {
 }

 void templ(alias fun)() {
      writeln(fun.stringof);   // prints "main()"
 }

 void main()
 {
      templ!(main);
 }

 Works for both D1 and D2

 I was a bit surprised too since the code dsimcha posted did exactly that.
 However, change void doStuff() to void doStuff(int a) and you got an error.
 I remembered hacking around that one, if anybody knows how to do it better
 it would be good to know:
 void doStuff(int a)
 {
 // Do stuff.
 }
 void templ(T...)()
     if (T.length==1)
 {
     writeln( T.stringof[6..$-1] );
 }
 void main()
 {
     templ!doStuff();
 }

Yeah, now that I look into it further, what you describe is exactly the problem.
The obvious way only works for functions w/o parameters.  I simplified my
example
before I posted it and never bothered to test it.

Oct 15 2009

Lutger <lutger.blijdestijn gmail.com> writes:

dsimcha wrote:
 
 Yeah, now that I look into it further, what you describe is exactly the
 problem.
 The obvious way only works for functions w/o parameters.  I simplified my
 example before I posted it and never bothered to test it.

See my reply to my reply (sorry!) for a better way to make it work.

It is because of this I think:

void foo() {}
void bar(int) {}

void main()
{
    writeln(foo.stringof); // ok
    writeln(bar.stringof); // error: not callable using argument types ()
    writeln(bar(1).stringof); // ok
}

It should be doable to make a template for getting the proper name of any 
aliased function I think.

Oct 15 2009

Jacob Carlborg <doob me.com> writes:

On 10/15/09 18:06, Lutger wrote:
 dsimcha wrote:
 Yeah, now that I look into it further, what you describe is exactly the
 problem.
 The obvious way only works for functions w/o parameters.  I simplified my
 example before I posted it and never bothered to test it.

 See my reply to my reply (sorry!) for a better way to make it work.

 It is because of this I think:

 void foo() {}
 void bar(int) {}

 void main()
 {
      writeln(foo.stringof); // ok
      writeln(bar.stringof); // error: not callable using argument types ()
      writeln(bar(1).stringof); // ok
 }

 It should be doable to make a template for getting the proper name of any
 aliased function I think.

See my reply to dsimcha

Oct 15 2009

Jacob Carlborg <doob me.com> writes:

On 10/15/09 17:55, dsimcha wrote:
 == Quote from Lutger (lutger.blijdestijn gmail.com)'s article
 Denis Koroskin wrote:
 On Thu, 15 Oct 2009 18:22:37 +0400, dsimcha<dsimcha yahoo.com>  wrote:

 Jacob Carlborg Wrote:

 On 10/14/09 06:36, dsimcha wrote:
 Is there a way to get the name of an alias parameter at compile

 time?  For
 example:

 void doStuff() {
       // Do stuff.
 }

 void templ(alias fun)() {
      writeln(fun.stringof);  // Prints doStuff.
 }

 Do you want that to print "fun" instead of "doStuff"?

 No, the whole point is that I want to print "doStuff".

 What's the big deal?

 import std.stdio;

 void doStuff() {
 }

 void templ(alias fun)() {
       writeln(fun.stringof);   // prints "main()"
 }

 void main()
 {
       templ!(main);
 }

 Works for both D1 and D2

 I was a bit surprised too since the code dsimcha posted did exactly that.
 However, change void doStuff() to void doStuff(int a) and you got an error.
 I remembered hacking around that one, if anybody knows how to do it better
 it would be good to know:
 void doStuff(int a)
 {
 // Do stuff.
 }
 void templ(T...)()
      if (T.length==1)
 {
      writeln( T.stringof[6..$-1] );
 }
 void main()
 {
      templ!doStuff();
 }

 Yeah, now that I look into it further, what you describe is exactly the
problem.
 The obvious way only works for functions w/o parameters.  I simplified my
example
 before I posted it and never bothered to test it.

Oh, that problem. Just use a function pointer and get the name of that 
instead, like this: 
http://www.dsource.org/projects/dstep/browser/dstep/internal/Traits.d 
(functionNameOf at line 17)

Oct 15 2009

Lutger <lutger.blijdestijn gmail.com> writes:

Jacob Carlborg wrote:

...
 
 Oh, that problem. Just use a function pointer and get the name of that
 instead, like this:
 http://www.dsource.org/projects/dstep/browser/dstep/internal/Traits.d
 (functionNameOf at line 17)

Right, good to know LDC does get it right. 

I found one bugzilla report about it, though I'm not sure it really is a 
bug: http://d.puremagic.com/issues/show_bug.cgi?id=1373

There sure are a lot of bugs concerning .stringof!

Oct 15 2009

Lutger <lutger.blijdestijn gmail.com> writes:

Bah, I replied too soon. These also work, makes sense now I think about it:

void doStuff(int a ) {}

void templ(alias fun)()
{
    writeln( (&fun).stringof[2..$] );  // prints doStuff (really)  
    writeln( fun(int.init).stringof ); // prints doStuff(0) 
}

Oct 15 2009

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digitalmars.D - Get name of alias parameter at compile time?