Fibonacci in C++ Templates
The article discusses the implementation of Fibonacci numbers in C++ using both recursive functions and templates. It explains how C++ templates allow for compile-time computation, generating class definitions for each Fibonacci number. The article also highlights the limitations of template instantiation and its implications for compile-time evaluation.
- ▪A recursive Fibonacci implementation in C++ is straightforward and involves a simple function.
- ▪C++ templates enable the creation of generic code that is evaluated at compile-time.
- ▪The template implementation of Fibonacci computes values without runtime overhead, only printing results to stdout.
Opening excerpt (first ~120 words) tap to expand
A recursive Fibonacci number implementation in C++ is straightforward: int fib(int n) { if (n <= 1) return n; return fib(n - 1) + fib(n - 2); } int main() { int n = 10; std::cout << "The Fibonacci number at position " << n << " is: " << fib(n) << std::endl; return 0; } C++ templates let us write "generic" code, based on some parameters, at compile-time. The C++ compiler then generates code for us based on each type/value instantiation. It turns out a Fibonacci number implementation in C++ templates is also possible: template <int N> struct Fib { static constexpr int value = Fib<N-1>::value + Fib<N-2>::value; }; template <> struct Fib<0> { static constexpr int value = 0; }; template <> struct Fib<1> { static constexpr int value = 1; }; int main() { constexpr int n = 10; std::cout << "The…
Excerpt limited to ~120 words for fair-use compliance. The full article is at Neilchen.
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