Also: enable all warnings the compiler offers and compile the code with different compilers (clang, gcc, MSVC - they all have different warnings), add copious amounts of assert checks, compile and test with the clang sanitizers enabled (address sanitizer, undefined behaviour sanitizer, thread sanitizer), and run the code through static analyzers (e.g. clang static analyzer and the one in Visual Studio), minimize dynamic allocation and pointer use.

With all those combined it's quite hard to hit segmentation faults and memory corruption and the source code will generally become "cleaner" and more robust.