feat: nullptr type

include/version.h.in

@@ -6,3 +6,5 @@
 #define VERSION_TWEAK @PROJECT_VERSION_TWEAK @
 
 #define VERSION "@PROJECT_VERSION@"
+
+#define PROJECT_NAME "@PROJECT_NAME@"

src/main.cpp

@@ -1,10 +1,38 @@
 #include <cstdlib>
 #include <iostream>
+#include <type_traits>
 
 #include "version.h"
 
+void call_test(char *) { std::cout << "call_test(char *) called" << std::endl; }
+
+void call_test(int) { std::cout << "call_test(int) called" << std::endl; }
+
 int main(int argc, char **argv) {
-  std::cout << "Hello, world! Version " << VERSION << std::endl;
+
+  std::cout << "Running " << PROJECT_NAME << ", version " << VERSION << "\n"
+            << std::endl;
+
+  if (std::is_same<decltype(NULL), decltype(0)>::value) {
+    std::cout << "NULL == 0" << std::endl;
+  }
+
+  if (std::is_same<decltype(NULL), decltype((void *)0)>::value) {
+    std::cout << "NULL == (void *)0" << std::endl;
+  }
+
+  if (std::is_same<decltype(NULL), decltype(__null)>::value) {
+    std::cout << "NULL == __null" << std::endl;
+  }
+
+  if (std::is_same<decltype(NULL), std::nullptr_t>::value) {
+    std::cout << "NULL == nullptr" << std::endl;
+  }
+
+  call_test(0);
+  call_test(nullptr);
+
+  std::cout << "\nExiting" << std::endl;
 
   return EXIT_SUCCESS;
 }