digitalmars.D.bugs - [Issue 20895] New: Error with alias to struct member or member
- d-bugmail puremagic.com (57/57) Jun 04 2020 https://issues.dlang.org/show_bug.cgi?id=20895
https://issues.dlang.org/show_bug.cgi?id=20895 Issue ID: 20895 Summary: Error with alias to struct member or member function Product: D Version: D2 Hardware: x86 OS: Windows Status: NEW Severity: enhancement Priority: P1 Component: dmd Assignee: nobody puremagic.com Reporter: john.michael.hall gmail.com The code below has two unittests. The first one fails to compile and generates an error "this for foo needs to be type Foo not type Bar". A similar error would be given to do the same thing with an alias to the struct member. The second one has broadly the same functionality, but replaces the structs with classes and successfully compiles. Ideally there would be some kind of workaround for structs. For instance, alias x.foo this; fails to compile but would be a syntax consistent with other D features. unittest { static struct Foo { int value; int foo() { return value + 1; } } static struct Bar { Foo x; alias bar = x.foo; } Bar x = Bar(Foo(1)); assert(x.bar == 2); } unittest { static class Foo { int value; this(int x) { value = x;} int foo() { return value + 1; } } static class Bar : Foo { this(int x) { super(x);} alias bar = foo; } Bar x = new Bar(1); assert(x.bar == 2); } --
Jun 04 2020