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Foundation is actually open source http://www.opensource.apple.com/source/CF/CF-855.11/CFString.c http://www.opensource.apple.com/source/CF/CF-855.11/CFString..

• gilgoomesh 12y ago
  That's CoreFoundation, not Foundation. CoreFoundation is plain C and relatively small in feature set. Foundation is Objective-C and much larger. It's a lot easier to work with the Foundation Objective-C API. They both manipulate the same data structures (or nearly the same with zero-cost bridging) but Foundation is far less verbose and a little more dynamic (no need for manual buffer allocations and configuring callback structures).
  • dmitryskiba 12y ago
    There is Foundation implementation based on CoreFoundation: https://github.com/apportable/Foundation https://github.com/apportable/Foundation