More stuff with templates

3 files changed, 56 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;
+}
diff --git a/templates/println.cpp b/templates/println.cpp
new file mode 100644
index 0000000..62f27ac
--- /dev/null
+++ b/templates/println.cpp
@@ -0,0 +1,18 @@
+#include <iostream>
+
+template<auto X> void println() { std::cout << X << std::endl; }
+
+int main() {
+        println<1.23>();
+        println<42>();
+
+        // The following attempts to print a string do not work
+        // uncomment to see why
+        // 1.
+        // println<"Hello!">();
+        // 2.
+        // constexpr std::string_view hello = "Hello!";
+        // println<hello>();
+
+        return 0;
+}
diff --git a/templates/std_array.cpp b/templates/std_array.cpp
new file mode 100644
index 0000000..8044cb2
--- /dev/null
+++ b/templates/std_array.cpp
@@ -0,0 +1,16 @@
+#include <array>
+#include <iostream>
+
+int main() {
+        std::array<double, 5> a {1.0, 1.1, 1.2};
+        std::cout << "Capacity of a: " << a.size() << std::endl;
+
+        a[3] = 1.3;
+        a[4] = 1.4;
+
+        for (auto x : a)
+                std::cout << x << " ";
+        std::cout << std::endl;
+
+        return 0;
+}