Arbitrary-precision Arithmetic

• ubasic implementation
  • faster than lukewarn C implementation
• reference to get C/C++ arbitary precision arithmetic library

overflow

• detecting overflow with template
• paper about integer overflow
• Catching Integer Overflows in C
• things to take care about bit shift

Boost.MultiPrecision

• document
• number reference

Ruby

• Integer
  • latest implementation
  • Bignum
  • Fixnum