| class | class Classname { body } ; | A collection of functions and data members, and descriptions of its lifecycle management (constructors and destructors) |
| namespace | namespace nname { body } ; | A collection of declarations and definitions, of classes, functions and static members, perhaps spanning multiple files |
| header file | .h | class definitions, template definitions, function declarations (with default argument definitions), inline definitions, static object declarations |
| source code module | .cpp | Function definitions, static object definitions |
| compiled “object” module | .o or .obj | Each .cpp module is compiled into a binary module as an intermediate step in building a library or executable. |
| library | .lib or .la (+ .so or .dll if dynamic) | An indexed collection of object files linked together. No main() function must exist in any code module in a library. |
| devel package | lib + header files | A library along with accompanying header files |
| application | .exe on windows, no particular extension on *nix | A collection of object files, linked with libraries, to form an application. Contains exactly one function definition called main(). |
