The BArchivable protocol for objects that can archive themselves and be instantiated from their archives.

The BBlockCache class provides a simple mechanism for caching fixed-length blocks of memory.

The BList class, a container for keeping track of a number of data items, typically object pointers.

The BLocker and BAutolock classes for implementing locking mechanisms.

The BDataIO and BPositionIO protocols for objects that can be read and written, and the BMemoryIO and BMallocIO classes that implement the protocols.

The BFlattenable protocol for objects that can write themselves to a flattened representation.

The BMessageRunner class sends a message over and over.

The BString class is an interface to smart string allocation, storage, and manipulation. Call me weak, but I can't live without it.

The BStopWatch class times your functions. Use it when you're developing your app.

Common defined types and constants, such as int32 and int64.

The error codes for (theoretically) all the software kits. (Some error code may have snuck into other kits.)

Type codes for identifying data types in messages, attributes, and resources.

Utility functions such as atomic_add(), swap_data(), and convert_to_utf8().

Thread Local Storage functions that let you define global variables whose values depend on the thread from which they're accessed. These functions are handy when you're porting code that was designed for a single-threaded system.