www.digitalmars.com         C & C++   DMDScript  

digitalmars.D.bugs - [Issue 17773] New: this template parameter not working from derived

https://issues.dlang.org/show_bug.cgi?id=17773

          Issue ID: 17773
           Summary: this template parameter not working from derived class
           Product: D
           Version: D2
          Hardware: x86_64
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P1
         Component: dmd
          Assignee: nobody puremagic.com
          Reporter: code dawg.eu

cat > bug.d << CODE
class Base
{
    this(size_t size)
    {
    }

    size_t classSize(this This)()
    {
        pragma(msg, This);
        return This.sizeof;
    }
}

class Derived : Base
{
    this()
    {
        super(classSize);
    }

    void foo()
    {
        classSize;
    }
}

void test()
{
    auto derived = new Derived;
    auto size = derived.classSize;
}
CODE
dmd -c bug
----
bug.d(18): Error: constructor bug.Base.this (ulong size) is not callable using
argument types (void)
bug.d(23): Error: template classSize(this This)() has no type
Derived
----

Seems like template this parameters are not correctly resolved/inferred when
calling such methods from a derived instance.

--
Aug 22