The University of Iowa The College of Liberal Arts and Sciences Department of Computer Science
Lecture/Lab #22
Modularity: separate compilation
What's a common name for all of the following constructs?
#include, #define / #undef, #ifdef / #endif, #error
When is the preprocessor called?
What's the result of the preprocessing step?
https://repl.it/@agurtovoy/lab22-separate-compilation
source-1.cpp
source-2.cpp
Object file 1
Object file 2
Executable
Compilation
(includes preprocessing)
Linking
source-3.cpp
Object file 3
Ability to organize a program into a set of independent physical "modules"
point.cpp
point.hpp
point interface
point implementation
#include <point.hpp>
chess_piece.cpp
use point
Headers can include other headers.
Headers allows us to ensure that the entity definitions are the same in each file.
Because a header might be included more than once, we need to write headers in a way that is safe even if the header is included multiple times.
A .cpp file with all the header files included is called a translation unit.
Factor out `car` base class into a separate .cpp file
https://repl.it/@agurtovoy/lab22-exercise1
Open the exercise template
Write your code, press Run to test
When you're done, grab your Repl's link and send it as a direct message to me (agurtovoy)
Click on the corresponding option in the "Lab22 exercises" poll in #general
By Aleksey Gurtovoy
