initial

src/branching.rs

@@ -0,0 +1,20 @@
+
+#[macro_export]
+macro_rules! invoke_once {
+    () => {
+        unsafe {
+            static mut __VALUE: bool = false;
+            if __VALUE { false } else { __VALUE = true; true }
+        }
+    };
+
+    // if this is used inside of an unsafe codeblock
+    // use this branch to avoid the unnecessary unsafe block warning
+    (unsafe) => {
+        {
+        static mut __VALUE: bool = false;
+        if __VALUE { false } else { __VALUE = true; true }
+        }
+    }
+}
+