it's an evolutionary (as opposed to revolutionary) language; it is in many ways a reimagining of c++ based on decades of observing the latter's flaws and weaknesses in the real world. if you're in the c or c++ ecosystem already you will likely find D a pleasant set of improvements to c++.

For example, C and C++ still cannot compile this:

    int foo() { return bar(); }

    int bar() { return 3; }