Unclear about the benefits of D over C++ and Java

[Ola Fosheim Grøstad via Digitalmars-d]

On Saturday, 2 January 2016 at 11:31:24 UTC, Dibyendu Majumdar 
wrote:
> I feel that for someone like me it is not clear what 
> significant advantages D has over C++ or Java to make a switch. 
> I cannot afford to experiment with a language unless I know for 
> certain the benefits of using it.

If you are truly proficient in C++ then you probably are better 
off with C++ at this point than using languages like D, Rust or 
Swift, at least for long term commercial projects.

> * Do D compilers generate more efficient code compared to C++ 
> compilers?

No. The best D compilers use backends written for C/C++ 
(llvm/gcc).

> * Can D generics do everything C++ templates can (are they 
> Turing complete for instance) - and what additional 
> capabilities does D have that would make a significant 
> difference to the way templates are used in C++?

Certain things are more tedious in C++, like adding methods based 
on template parameters. Compile time reflection is also more 
tedious in C++.

Yet again, certain other things look syntactically better in C++ 
and other things look better syntactically in D.

> * How does D's performance compare with Java when it comes to 
> concurrent applications or garbage collection?

Java has much better garbage collectors. Concurrency frameworks 
have been more thoroughly tested in Java and C++.

> * How stable is D? Can one use it without fear that the next 
> version will significantly change the language and therefore 
> one would have to rewrite?

Java and C++ are more mature and have been more stable.