Fail.
Ok, i tried something like this:
[code]
import std.stdio;

mixin template TConvertTo(T : Object,  U) {
        T!(U) ConvertTo() inout {
                return cast(T!U) this;
        }
        
        alias ConvertTo this;
}

class Foo(T) {
public:
        T Num;
        
        mixin TConvertTo!(typeof(this), float);
        
}
[/code]

but it fails with:
template_alias_this_cast.d(4): Error: template instance T!(float) T is not a template declaration, it is a class
template_alias_this_cast.d(4): Error: T!(float) is used as a type
template_alias_this_cast.d(15): Error: mixin template_alias_this_cast.Foo!(float).Foo.TConvertTo!(Foo,float) error instantiating template_alias_this_cast.d(19): Error: template instance template_alias_this_cast.Foo!(float) error instantiating

If i change it to:
[code]
import std.stdio;

mixin template TConvertTo(V) {
        Foo!(V) ConvertTo() inout {
                return cast(Foo!V) this;
        }
        
        alias ConvertTo this;
}

class Foo(T) {
public:
        T Num;
        
        mixin TConvertTo!(float);
        
}
[/code]

it works. But i think my first idea should work, too.

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