D programming Language

COM Programming

COM objects are analogous to D interfaces. Any COM object can be expressed as a D interface, and every D object with an interface X can be exposed as a COM object X. This means that D is compatible with COM objects implemented in other languages.

While not strictly necessary, the Phobos library provides an Object useful as a super class for all D COM objects, called ComObject. ComObject provides a default implementation for QueryInterface(), AddRef(), and Release().

Windows COM objects use the Windows calling convention, which is not the default for D, so COM functions need to have the attribute extern (Windows). So, to write a COM object:

import com;
class MyCOMobject : ComObject

{

extern (Windows):

}

The sample code includes an example COM client program and server DLL.

D vs Other Languages

This table is a quick and rough comparison of various features of D with other languages it is frequently compared with. While many capabilities are available with libraries, this table is for features built in to the language itself.

Feature	D	C	C++	C#	Java
Garbage Collection	Yes	No	No	Yes	Yes
Functions
Function delegates	Yes	No	No	Yes	No
Function overloading	Yes	No	Yes	Yes	Yes
Out function parameters	Yes	Yes	Yes	Yes	No
Nested functions	Yes	No	No	No	No
Function literals	Yes	No	No	No	No
Dynamic closures	Yes	No	No	No	No
Covariant return types	Yes	No	Yes	No	No
Arrays
Lightweight arrays	Yes	Yes	Yes	No	No
Resizeable arrays	Yes	No	No	No	No
Arrays of bits	Yes	No	No	No	No
Built-in strings	Yes	No	No	Yes	Yes
Array slicing	Yes	No	No	No	No
Array bounds checking	Yes	No	No	Yes	Yes
Associative arrays	Yes	No	No	No	No
Strong typedefs	Yes	No	No	No	No
Aliases	Yes	Yes	Yes	No	No
OOP
Object Oriented	Yes	No	Yes	Yes	Yes
Multiple Inheritance	No	No	Yes	No	No
Interfaces	Yes	No	Yes	Yes	Yes
Operator overloading	Yes	No	Yes	Yes	No
Modules	Yes	No	Yes	Yes	Yes
Dynamic class loading	No	No	No	No	Yes
Inner classes	No	No	No	No	Yes
Covariant return types	Yes	No	Yes	No	No
Performance
Inline assembler	Yes	Yes	Yes	No	No
Direct access to hardware	Yes	Yes	Yes	No	No
Lightweight objects	Yes	Yes	Yes	Yes	No
Explicit memory allocation control	Yes	Yes	Yes	No	No
Independent of VM	Yes	Yes	Yes	No	No
Direct native code gen	Yes	Yes	Yes	No	No
Templates	Yes	No	Yes	No	No
Reliability
Design by Contract	Yes	No	No	No	No
Unit testing	Yes	No	No	No	No
Static construction order	Yes	No	No	Yes	Yes
Guaranteed initialization	Yes	No	No	Yes	Yes
RAII	Yes	No	Yes	Yes	No
Exception handling	Yes	No	Yes	Yes	Yes
try-catch-finally blocks	Yes	No	No	Yes	Yes
Thread synchronization primitives	Yes	No	No	Yes	Yes
Compatibility
Algol-style syntax	Yes	Yes	Yes	Yes	Yes
Enumerated types	Yes	Yes	Yes	Yes	No
Support all C types	Yes	Yes	No	No	No
Long double floating point	Yes	Yes	Yes	No	No
Complex and Imaginary	Yes	Yes	No	No	No
Direct access to C	Yes	Yes	Yes	No	No
Use existing debuggers	Yes	Yes	Yes	No	No
Struct member alignment control	Yes	Yes	Yes	No	No
Generates standard object files	Yes	Yes	Yes	No	No
Macro preprocessor	No	Yes	Yes	No	No
Other
Conditional compilation	Yes	Yes	Yes	Yes	No

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