fbshipit-source-id: d0f4b1833968aae403b114119f4e8cda184361c9

libs/fbjni/src/main/cpp/include/fb/StaticInitialized.h

@@ -0,0 +1,38 @@
+/*
+ *  Copyright (c) 2015-present, Facebook, Inc.
+ *
+ *  This source code is licensed under the MIT license found in the LICENSE
+ *  file in the root directory of this source tree.
+ *
+ */
+#pragma once
+#include <fb/assert.h>
+#include <utility>
+
+namespace facebook {
+
+// Class that lets you declare a global but does not add a static constructor
+// to the binary. Eventually I'd like to have this auto-initialize in a
+// multithreaded environment but for now it's easiest just to use manual
+// initialization.
+template <typename T>
+class StaticInitialized {
+public:
+  constexpr StaticInitialized() :
+    m_instance(nullptr)
+  {}
+
+  template <typename ...Args>
+  void initialize(Args&&... arguments) {
+    FBASSERT(!m_instance);
+    m_instance = new T(std::forward<Args>(arguments)...);
+  }
+
+  T* operator->() const {
+    return m_instance;
+  }
+private:
+  T* m_instance;
+};
+
+}