• d-bugmail puremagic.com (48/48) May 07 2018 https://issues.dlang.org/show_bug.cgi?id=18840

d-bugmail puremagic.com writes:

https://issues.dlang.org/show_bug.cgi?id=18840

          Issue ID: 18840
           Summary: static foreach over an object's tupleof gives wrong
                    information for const variables
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: major
          Priority: P1
         Component: dmd
          Assignee: nobody puremagic.com
          Reporter: gooberman gmail.com

Created attachment 1691
  --> https://issues.dlang.org/attachment.cgi?id=1691&action=edit
Simple test struct with a foreach and a static foreach outputting details at
compile time

I have only tested this with two traits so far, but it does make generating
automated bindings/equivalent objects inaccurate. At a minimum, the wrong
__traits information gets returned from:

* identifier - returns the name of the static foreach iteration variable
* parent - returns the parent of said variable rather than the object type

Accessing the variables directly from object.tupleof[ index ] works just fine.

The attached test.d shows the issue.

Current output when compiling that file:

foreach pass:
foo has parent SomeStruct
bar has parent SomeStruct
anotherConst has parent SomeStruct
notAConst has parent SomeStruct
static foreach pass:
var has parent main()
bar has parent SomeStruct
var has parent main()
notAConst has parent SomeStruct

Expected output when compiling that file:

foreach pass:
foo has parent SomeStruct
bar has parent SomeStruct
anotherConst has parent SomeStruct
notAConst has parent SomeStruct
static foreach pass:
foo has parent SomeStruct
bar has parent SomeStruct
anotherConst has parent SomeStruct
notAConst has parent SomeStruct

--