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digitalmars.D - static foreach / iterate over all consts in a module?

reply =?iso-8859-1?Q?Robert_M._M=FCnch?= <robert.muench saphirion.com> writes:
If I want to iterate over all const WM_* windows message definitions 
during compile time, can this be done with a static foreach and the 
allMembers traits?

Something like:

static foreach(wm; __traits(allMembers, mymodule)) {
	static if(wm[1..3] == "WM_") {


-- 
Robert M. Münch
http://www.saphirion.com
smarter | better | faster
Mar 03
next sibling parent Rubn <where is.this> writes:
On Sunday, 3 March 2019 at 19:20:00 UTC, Robert M. Münch wrote:
 If I want to iterate over all const WM_* windows message 
 definitions during compile time, can this be done with a static 
 foreach and the allMembers traits?

 Something like:

 static foreach(wm; __traits(allMembers, mymodule)) {
 	static if(wm[1..3] == "WM_") {
Something like this? You can also use static foreach instead, but then you'll need to add another pair of `{}` brackets otherwise you'll get `member` is defined multiple times. https://run.dlang.io/is/7legpv module thisModule; struct MW_ {} const(MW_)* one; const(MW_)* two; void main() { import std.stdio; foreach(memberName ; __traits(allMembers, thisModule)) { alias member = __traits(getMember, thisModule, memberName); static if(is(typeof(member) : const(MW_)*)) { writeln(memberName, ": ", member); } } }
Mar 03
prev sibling next sibling parent reply Rubn <where is.this> writes:
On Sunday, 3 March 2019 at 19:20:00 UTC, Robert M. Münch wrote:
 If I want to iterate over all const WM_* windows message 
 definitions during compile time, can this be done with a static 
 foreach and the allMembers traits?

 Something like:

 static foreach(wm; __traits(allMembers, mymodule)) {
 	static if(wm[1..3] == "WM_") {
Ah I misunderstood, thought that * was a pointer not a wildcard :P. It depends on how it is stored, if it is just an enum, then yes you can do pretty much what you have already. Some example of what you have already would help as well. https://run.dlang.io/is/l2jyWP module thisModule; enum WM_CREATE = 1; enum WM_DESTROY = 2; void main() { import std.stdio; foreach(memberName ; __traits(allMembers, thisModule)) { alias member = __traits(getMember, thisModule, memberName); static if(memberName.length >= 3 && memberName[0 .. 3] == "WM_") { writeln(memberName, ": ", member); } } }
Mar 03
parent reply =?iso-8859-1?Q?Robert_M._M=FCnch?= <robert.muench saphirion.com> writes:
On 2019-03-04 00:37:56 +0000, Rubn said:

 It depends on how it is stored, if it is just an enum, then yes you can 
 do pretty much what you have already. Some example of what you have 
 already would help as well.
 
 https://run.dlang.io/is/l2jyWP
 
 module thisModule;
 
 enum WM_CREATE = 1;
 enum WM_DESTROY = 2;
 
 void main()
 {
      import std.stdio;
 
      foreach(memberName ; __traits(allMembers, thisModule))
      {
          alias member = __traits(getMember, thisModule, memberName);
          static if(memberName.length >= 3 && memberName[0 .. 3] == "WM_") {
              writeln(memberName, ": ", member);
          }
      }
 }
Thanks. Trying this (I replaced thisModule by core.sys.windows.winuser everywhere) I get the following errors for the line with the "writeln": Error: unexpected ( in declarator Error: basic type expected, not ": " Error: found ": " when expecting ) Error: no identifier for declarator writeln(memberName, _error_) Error: semicolon expected following function declaration Error: declaration expected, not , Wondering why the "writeln" bombs out here... -- Robert M. Münch http://www.saphirion.com smarter | better | faster
Mar 05
parent =?iso-8859-1?Q?Robert_M._M=FCnch?= <robert.muench saphirion.com> writes:
On 2019-03-05 12:57:15 +0000, Robert M. Münch said:

 On 2019-03-04 00:37:56 +0000, Rubn said:
 
 It depends on how it is stored, if it is just an enum, then yes you can 
 do pretty much what you have already. Some example of what you have 
 already would help as well.
 
 https://run.dlang.io/is/l2jyWP
 
 module thisModule;
 
 enum WM_CREATE = 1;
 enum WM_DESTROY = 2;
 
 void main()
 {
 import std.stdio;
 
 foreach(memberName ; __traits(allMembers, thisModule))
 {
 alias member = __traits(getMember, thisModule, memberName);
 static if(memberName.length >= 3 && memberName[0 .. 3] == "WM_") {
 writeln(memberName, ": ", member);
 }
 }
 }
Thanks. Trying this (I replaced thisModule by core.sys.windows.winuser everywhere) I get the following errors for the line with the "writeln": Error: unexpected ( in declarator Error: basic type expected, not ": " Error: found ": " when expecting ) Error: no identifier for declarator writeln(memberName, _error_) Error: semicolon expected following function declaration Error: declaration expected, not , Wondering why the "writeln" bombs out here...
I had this CTFE loop in the global scope, I think it's related. Using pragma(msg, ...) works in the global scope. -- Robert M. Münch http://www.saphirion.com smarter | better | faster
Mar 05
prev sibling parent Nicholas Wilson <iamthewilsonator hotmail.com> writes:
On Sunday, 3 March 2019 at 19:20:00 UTC, Robert M. Münch wrote:
 If I want to iterate over all const WM_* windows message 
 definitions during compile time, can this be done with a static 
 foreach and the allMembers traits?

 Something like:

 static foreach(wm; __traits(allMembers, mymodule)) {
 	static if(wm[1..3] == "WM_") {
 static foreach(wm; __traits(allMembers, mymodule)) {
 	static if(wm.stringof[1..3] == "WM_") {
Mar 05