Fibonacci in C++ using compile-time template meta-programming and inheritance-based templated loop unrolling

1 files changed, 35 insertions, 0 deletions

diff --git a/entries/timstr/fib.cpp b/entries/timstr/fib.cpp
new file mode 100644
index 0000000..08e5802
--- /dev/null
+++ b/entries/timstr/fib.cpp
@@ -0,0 +1,35 @@
+#include <iostream>
+#include <cstdint>
+
+template<std::size_t N>
+struct fib {
+    static constexpr std::size_t value = fib<N - 1>::value + fib<N - 2>::value;
+};
+
+template<>
+struct fib<0> {
+    static constexpr std::size_t value = 1;
+};
+
+template<>
+struct fib<1> {
+    static constexpr std::size_t value = 1;
+};
+
+template<std::size_t N>
+constexpr std::size_t fib_v = fib<N>::value;
+
+template<std::size_t N>
+struct print_fib : print_fib<N - 1> {
+    print_fib() noexcept {
+        std::cout << fib_v<N - 1> << '\n';
+    }
+};
+
+template<>
+struct print_fib<0> {};
+
+int main() {
+    print_fib<32>{};
+    return 0;
+}
\ No newline at end of file