C++ usage in embedded systems

Question

What features of C++ should be avoided in embedded systems?

Please classify the answer by reason such as:

• memory usage
• code size
• speed<

Answer 1

Note that the cost of exceptions depends on your code. In one application I profiled (a relatively small one on ARM968), exception support added 2 % to execution time, and code size was increased by 9.5 KB. In this application, exceptions were thrown only in case something seriously bad happened -- i.e. never in practice -- which kept the execution time overhead very low.