![]() ![]() While we could attempt to always correctly release these as soon as they are no longer needed, a more interesting solution is to use an auto-release pool.Īuto-release pools are a concept familiar to Objective-C programmers, since they are used extensively in all of Apple’s APIs. Many of the functions we’ve written allocate _l unions, and these are never released. Printf("Fibonacci number %d is %llu.\n", upto, fib) Īs you have probably noticed, the code above is unfortunately leaking tons of memory. If (argc >= 2) upto = strtol(argv, NULL, 10) ![]() We now have all the pieces in place to use the Y-combinator to replace our natively recursive implementation of fib: _l fibonacci = y_combine(fib_generator) There are many ways of calculating Fibonacci numbers, but the naïve implementation which follows the mathematical definition is this: unsigned long long fib(int n) The Fibonacci sequence is a sequence of numbers in which each integer is equal to the previous two integers added: 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, etc. What we’re going to create here is a program that returns a number in the Fibonacci sequence. However, we will get to play with some very cool concepts and techniques: functional programming in C, closures, implementing autorelease pools from scratch, data structures (linked lists and b-trees), bitwise operations, recursivity, memoization, and the Y-Combinator. 2013 4 Kudos Fibonacci
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