If you have an existing C++ program and want to start using D, it probably isn't practical to rewrite the entire application. However, it may be possible to start writing new components of the application in D. Let's look at how this can be done.
Review how D interfaces with C. Any
extern functions of C work exactly the same way in C++. You'll also need to get the appropriate C++ compiler. On 32-bit Windows, you'll need the Digital Mars C compiler to pair with DMD. On 64-bit Windows, the Microsoft Visual C++ compiler will work. On Linux, use g++.
Let's interface D with C++ by executing the following steps:
extern(C++); otherwise, use them in the same way as you use ...