[Issue 13623] New: std.typecons.Proxy doesn't work inside classes

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=13623

          Issue ID: 13623
           Summary: std.typecons.Proxy doesn't work inside classes
           Product: D
           Version: D2
          Hardware: x86_64
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P1
         Component: Phobos
          Assignee: nob...@puremagic.com
          Reporter: c...@dawg.eu

cat > bug.d << CODE
import std.typecons, std.traits;

class Foo
{
    private int value;
    mixin Proxy!value;

    this(int n){ value = n; }
}

unittest
{
    auto a = new Foo(10), b = new Foo(10);
    assert(a == b); // Proxy should override Object.opEquals
    a = 13;
}
CODE

dmd -unittest -main -run bug

----

I think it's reasonable for Proxy to only work inside structs, but there should
be a check in the mixin template.

    static assert(!is(typeof(this) == class), "Proxy cannot be used inside
classes.");

--