add more utilities

rx/CMakeLists.txt

@@ -4,6 +4,7 @@ find_package(Git)
 
 
 add_library(${PROJECT_NAME} OBJECT
+    src/die.cpp
     src/hexdump.cpp
     src/mem.cpp
     src/Version.cpp

rx/include/rx/atScopeExit.hpp

@@ -0,0 +1,13 @@
+#pragma once
+
+#include <utility>
+
+namespace rx {
+template <typename T> class atScopeExit {
+  T _object;
+
+public:
+  atScopeExit(T &&object) : _object(std::forward<T>(object)) {}
+  ~atScopeExit() { _object(); }
+};
+} // namespace rx

rx/include/rx/die.hpp

@@ -0,0 +1,7 @@
+#pragma once
+
+namespace rx {
+[[noreturn, gnu::format(printf, 1, 2)]] void die(const char *message, ...);
+[[gnu::format(printf, 2, 3)]] void dieIf(bool condition, const char *message,
+                                         ...);
+} // namespace rx

rx/src/die.cpp

@@ -0,0 +1,26 @@
+#pragma once
+#include "die.hpp"
+
+#include <cstdarg>
+#include <cstdio>
+#include <cstdlib>
+
+void rx::die(const char *message, ...) {
+  va_list args;
+  va_start(args, message);
+  std::vfprintf(stderr, message, args);
+  std::fprintf(stderr, "\n");
+  va_end(args);
+  std::abort();
+}
+
+void rx::dieIf(bool condition, const char *message, ...) {
+  if (condition) {
+    va_list args;
+    va_start(args, message);
+    std::vfprintf(stderr, message, args);
+    std::fprintf(stderr, "\n");
+    va_end(args);
+    std::abort();
+  }
+}