Arithmetic in computers is different from the math you learned
in school. It's 2's complement, and it's best to always keep
that in mind when writing programs.
From http://embed.cs.utah.edu/ioc/
" Examples of undefined integer overflows we have reported:
An SQLite bug
Some problems in SafeInt
GNU MPC
PHP
Firefox
GCC
PostgreSQL
LLVM
Python
We also reported bugs to BIND and OpenSSL. Most of the SPEC CPU
2006 benchmarks contain undefined overflows."
So how does D improve on C's model? If signed integers are
required to wrap around in D (no undefined behaviour), you also
prevent some otherwise possible optimizations (there is a reason
it's still undefined behaviour in C).
