So they cut multiple inheritance from the language (just as they cut operator overloading). The designers’ extensive C++ experience taught them that multiple inheritance just wasn’t worth the ...

(I am guessing that C++ did not use such a syntax because it might have made the initial pre-processor-based implementation more difficult, though since anonymous unions came later the concept of ...

I basically want to do multiple inheritance with mixins. No, you probably don't. Some degree of "IMO" here, but in C++, multiple inheritance is generally an indicator of flawed design.