given some struct:

writeln("face.glyph.bitmap = ", face.glyph.bitmap);

which displays the following:

face.glyph.bitmap = FT_Bitmap(30, 25, 25, 4105948, 256, 2, 0, null)

Is there a way for D to display the variable names within the FT_Bitmap?

For instance, the following code snippet outputs:

foreach (i, member; face.glyph.bitmap.tupleof) {
    writefln("Member %s:", i);
    writefln("  type : %s", typeof(member).stringof);
    writefln("  value: %s", member);
}

Member 0:
  type : int
  value: 30
Member 1:
  type : int
  value: 25
// dot...dot...dot
Member 6:
  type : byte
  value: 0
Member 7:
  type : void*
  value: null

So I've got type and value of each member, but I want their actual names?

My first naive attempt was to try member.stringof but this just returns the string "member".    Thanks.

On Saturday, 19 September 2015 at 19:52:56 UTC, WhatMeWorry wrote:
> So I've got type and value of each member, but I want their actual names?

http://dlang.org/phobos/std_traits.html#FieldNameTuple

You can also do something like `foo.tupleof[idx]["foo.".length .. $]` for an individual thing but the phobos one should be the nicest.

On Saturday, 19 September 2015 at 19:54:45 UTC, Adam D. Ruppe wrote:
> On Saturday, 19 September 2015 at 19:52:56 UTC, WhatMeWorry wrote:
>> So I've got type and value of each member, but I want their actual names?
>
> http://dlang.org/phobos/std_traits.html#FieldNameTuple
>
> You can also do something like `foo.tupleof[idx]["foo.".length .. $]` for an individual thing but the phobos one should be the nicest.


Thanks.  But now I have an even more fundamental problem.  I keep getting a FieldNameTuple is not defined.  But I've clearly got the import statement.  I even copied the example from Phobos verbatim:

import std.traits;

struct S { int x; float y; }
static assert(FieldNameTuple!S == TypeTuple!("x", "y"));

But I still get the error.

Error: template instance FieldNameTuple!S template 'FieldNameTuple' is not defined

I've been working for hours on this stupid thing. 	

On 09/19/2015 10:21 PM, WhatMeWorry wrote:
> On Saturday, 19 September 2015 at 19:54:45 UTC, Adam D. Ruppe wrote:
>> On Saturday, 19 September 2015 at 19:52:56 UTC, WhatMeWorry wrote:
>>> So I've got type and value of each member, but I want their actual
>>> names?
>>
>> http://dlang.org/phobos/std_traits.html#FieldNameTuple
>>
>> You can also do something like `foo.tupleof[idx]["foo.".length .. $]`
>> for an individual thing but the phobos one should be the nicest.
>
>
> Thanks.  But now I have an even more fundamental problem.  I keep
> getting a FieldNameTuple is not defined.  But I've clearly got the
> import statement.  I even copied the example from Phobos verbatim:
>
> import std.traits;
>
> struct S { int x; float y; }
> static assert(FieldNameTuple!S == TypeTuple!("x", "y"));
>
> But I still get the error.
>
> Error: template instance FieldNameTuple!S template 'FieldNameTuple' is
> not defined
>
> I've been working for hours on this stupid thing.

This compiles and passes the assert for me with v2.068.2-b1:

import std.traits;
import std.meta;

struct S { int x; float y; }
static assert(FieldNameTuple!S == AliasSeq!("x", "y"));

void main()
{}

(std.meta.AliasSeq is the new name for std.typetuple.TypeTuple but TypeTuple still works.)

Ali

On Sun, Sep 20, 2015 at 05:21:03AM +0000, WhatMeWorry via Digitalmars-d-learn wrote: [...]
> Thanks.  But now I have an even more fundamental problem.  I keep getting a FieldNameTuple is not defined.  But I've clearly got the import statement.  I even copied the example from Phobos verbatim:
> 
> import std.traits;
> 
> struct S { int x; float y; }
> static assert(FieldNameTuple!S == TypeTuple!("x", "y"));

You need to use is(...) when comparing types:

	static assert(is(FieldNameTuple!S == TypeTuple!("x", "y")));

HTH,


--T

On 09/19/2015 10:30 PM, H. S. Teoh via Digitalmars-d-learn wrote:
> On Sun, Sep 20, 2015 at 05:21:03AM +0000, WhatMeWorry via Digitalmars-d-learn wrote:
> [...]
>> Thanks.  But now I have an even more fundamental problem.  I keep
>> getting a FieldNameTuple is not defined.  But I've clearly got the
>> import statement.  I even copied the example from Phobos verbatim:
>>
>> import std.traits;
>>
>> struct S { int x; float y; }
>> static assert(FieldNameTuple!S == TypeTuple!("x", "y"));
>
> You need to use is(...) when comparing types:
>
> 	static assert(is(FieldNameTuple!S == TypeTuple!("x", "y")));
>
> HTH,
>
>
> --T
>

True but ever-confusingly, they are not types. :) It works without the is expression. Otherwise, we need to add typeofs as well:

static assert(is(typeof(FieldNameTuple!S) == typeof(AliasSeq!("x", "y"))));

Ali

On Sunday, 20 September 2015 at 05:50:16 UTC, Ali Çehreli wrote:
> On 09/19/2015 10:30 PM, H. S. Teoh via Digitalmars-d-learn wrote:
>> On Sun, Sep 20, 2015 at 05:21:03AM +0000, WhatMeWorry via Digitalmars-d-learn wrote:
>> [...]
>>> Thanks.  But now I have an even more fundamental problem.  I keep
>>> getting a FieldNameTuple is not defined.  But I've clearly got the
>>> import statement.  I even copied the example from Phobos verbatim:
>>>
>>> import std.traits;
>>>
>>> struct S { int x; float y; }
>>> static assert(FieldNameTuple!S == TypeTuple!("x", "y"));
>>
>> You need to use is(...) when comparing types:
>>
>> 	static assert(is(FieldNameTuple!S == TypeTuple!("x", "y")));
>>
>> HTH,
>>
>>
>> --T
>>
>
> True but ever-confusingly, they are not types. :) It works without the is expression. Otherwise, we need to add typeofs as well:
>
> static assert(is(typeof(FieldNameTuple!S) == typeof(AliasSeq!("x", "y"))));
>
> Ali

Should of tried this earlier, but just for grins I threw in another trait: EnumMembers.

import std.traits;

struct S { int x; float y; }
static assert(FieldNameTuple!S == TypeTuple!("x", "y"));  // FAILS

enum E : int { a, b, c }
int[] abc = cast(int[]) [ EnumMembers!E ];    // WORKS


The EnumMembers from traits compiles/links fine.  Ergo, it must be I've got an old version of D Lib?  I see on the web site that D Lib is now at 2.068.1

Looking at my old folders, I see a dmd-2.066_0-OneClickWindowInstaller folder that I must of used around October 2014 for my initial install.  Is there a tool or subsystem that I can use to see the history or FildNameTyple?

Now, I need to figure out how to upgrade my D, DMD or Phobos (not sure about terminology) without disturbing my Visual D environment.  Wish me luck :)

Thanks for helping me with these beginner questions.