C++ for Scientists - Technische Universität Dresden

238 CHAPTER 10. PROGRAMMING TOOLS
10.2.2 Debugging with graphical interface: DDD
More convenient than debugging on a text level is using a graphical interface like DDD (Data
Display Debugger). It has more or less the same functionality as gdb and in fact it runs gdb
internally. One can use it also with another text debugger.
As case study, we use a modified example from Section 5.4.5. In fact, the buggy program arose
by teaching § 5.4.5, i.e. one of the authors tried to reconstruct vector unroll example2.cpp
on the fly.
TODO: Find a better example. The above finally was okay, the tuning just did not change the
run-time behaviour.
In addition to the window above you will see a smaller one like in Figure 10.1, typically on the
right of the large window if there is enough space on your screen.
This control panel let you geer through the debug session in way that is
easier for beginner and even for some advanced users more convenient.
You have the following command:
Run Start or restart your program.
Interrupt If your program does not terminate or does not reach the next
break point you can stop it manually.
Step Go one step forward. If your position is a function call, jump into
the function.
Next Go to the next line in your source code. If you are located on a
function call do not jump into it unless there is a break point set
inside.
Figure 10.1: DDD
control panel