add readable and writable traits for signal-like structs

packages/signals/src/global/mod.rs

@@ -0,0 +1,25 @@
+use dioxus_core::prelude::{provide_root_context, try_consume_context};
+use std::{any::Any, cell::RefCell, collections::HashMap, rc::Rc};
+
+mod memo;
+pub use memo::*;
+
+mod signal;
+pub use signal::*;
+
+#[derive(Clone)]
+pub(crate) struct GlobalSignalContext {
+    signal: Rc<RefCell<HashMap<*const (), Box<dyn Any>>>>,
+}
+
+pub(crate) fn get_global_context() -> GlobalSignalContext {
+    match try_consume_context() {
+        Some(context) => context,
+        None => {
+            let context = GlobalSignalContext {
+                signal: Rc::new(RefCell::new(HashMap::new())),
+            };
+            provide_root_context(context).unwrap()
+        }
+    }
+}