• John Chapman (13/13) Nov 30 2018 ParameterIdentifierTuple produces different results depending on
• Neia Neutuladh (3/7) Nov 30 2018 Compiler and version would be helpful here.
• John Chapman (11/14) Nov 30 2018 Hmm, I was calling ParameterIdentifierTuple inside a lambda -
• John Chapman (4/20) Nov 30 2018 On Friday, 30 November 2018 at 19:37:52 UTC, John Chapman wrote:

John Chapman <johnch_atms hotmail.com> writes:

ParameterIdentifierTuple produces different results depending on 
whether unnamed parameters are built-in types or user types.

struct SomeType {
   void wrong(SomeType) {}
   void right(int) {}
}

ParameterIdentifierTuple!(__traits(getMember, SomeType, 
"wrong")); // tuple("SomeType")
ParameterIdentifierTuple!(__traits(getMember, SomeType, 
"right")); // tuple("")

Is this the intended behaviour? Shouldn't it just return empty 
strings in both cases? What would be the benefit of returning 
user type names?

Neia Neutuladh <neia ikeran.org> writes:

On Fri, 30 Nov 2018 18:18:36 +0000, John Chapman wrote:
 ParameterIdentifierTuple!(__traits(getMember, SomeType, "wrong"));
 // tuple("SomeType")
 ParameterIdentifierTuple!(__traits(getMember, SomeType, "right"));
 // tuple("")

Compiler and version would be helpful here.

I'm on DMD 2.081.1 and it yields the same results in each case: _param_0

John Chapman <johnch_atms hotmail.com> writes:

On Friday, 30 November 2018 at 19:07:14 UTC, Neia Neutuladh wrote:
 Compiler and version would be helpful here.

 I'm on DMD 2.081.1 and it yields the same results in each case: 
 _param_0

Hmm, I was calling ParameterIdentifierTuple inside a lambda - 
once I moved it into my main function I got the same output as 
you.

But … change SomeType to an interface and it reproduces the issue 
I reported above.

interface SomeType {
   void wrong(SomeType);
   void right(int);
}

I'm on DMD 2.083.0.

John Chapman <johnch_atms hotmail.com> writes:

On Friday, 30 November 2018 at 19:37:52 UTC, John Chapman wrote:
 On Friday, 30 November 2018 at 19:07:14 UTC, Neia Neutuladh 
 wrote:
 Compiler and version would be helpful here.

 I'm on DMD 2.081.1 and it yields the same results in each 
 case: _param_0

 Hmm, I was calling ParameterIdentifierTuple inside a lambda - 
 once I moved it into my main function I got the same output as 
 you.

 But … change SomeType to an interface and it reproduces the 
 issue I reported above.

 interface SomeType {
   void wrong(SomeType);
   void right(int);
 }

 I'm on DMD 2.083.0.

On Friday, 30 November 2018 at 19:37:52 UTC, John Chapman wrote:

This is pretty broken so I've opened a bug: 
https://issues.dlang.org/show_bug.cgi?id=19456