c++: if constexpr

userland/cpp/if_constexpr.cpp

@@ -0,0 +1,23 @@
+// https://cirosantilli.com/linux-kernel-module-cheat#cpp
+
+#if __cplusplus >= 201703L
+#include <cassert>
+#include <type_traits>
+
+template <class T>
+struct MyClass {
+    int myFunc() {
+        if constexpr(std::is_integral<T>())
+            return 1;
+        else
+            return 2;
+    }
+};
+#endif
+
+int main() {
+#if __cplusplus >= 201703L
+    assert(MyClass<int>().myFunc() == 1);
+    assert(MyClass<float>().myFunc() == 2);
+#endif
+}