More stuff with templates

1 files changed, 22 insertions, 0 deletions

diff --git a/templates/factorial.cpp b/templates/factorial.cpp
new file mode 100644
index 0000000..11e4789
--- /dev/null
+++ b/templates/factorial.cpp
@@ -0,0 +1,22 @@
+// Taken from https://en.wikipedia.org/wiki/Template_metaprogramming
+
+#include <iostream>
+
+template<long long N>
+class factorial {
+public:
+        static constexpr long long value = N * factorial<N-1>::value;
+};
+
+template<>
+class factorial<0> {
+public:
+        static constexpr long long value = 1;
+};
+
+int main() {
+        constexpr long long X = 12;
+        std::cout << factorial<X>::value << std::endl;
+
+        return 0;
+}