Some interesting functions to reuse from boost:

• Date & Time
• Any, a replacement for void
• constant size arrays
• Network IO
• Circular buffer
• Data conversion
• File system access
• Foreach, or how to get rid off iterators
• Format, a clean replacement for snprintf/sprintf
• Integer, a safer replacement for stdint.h
• Numerous Math functions
• Regular expressino functions
• Timer
• Typeof operator emulation