Refactor program module into submodules

1 files changed, 23 insertions, 0 deletions

diff --git a/mingling_core/src/program/single_instance.rs b/mingling_core/src/program/single_instance.rs
new file mode 100644
index 0000000..45d4d33
--- /dev/null
+++ b/mingling_core/src/program/single_instance.rs
@@ -0,0 +1,23 @@
+use std::sync::OnceLock;
+
+use crate::{Program, ProgramCollect};
+
+/// Global static reference to the current program instance
+pub(crate) static THIS_PROGRAM: OnceLock<Option<Box<dyn std::any::Any + Send + Sync>>> =
+    OnceLock::new();
+
+/// Returns a reference to the current program instance, panics if not set.
+pub fn this<C>() -> &'static Program<C>
+where
+    C: ProgramCollect<Enum = C> + 'static,
+{
+    try_get_this_program().expect("Program not initialized")
+}
+
+/// Returns a reference to the current program instance, if set.
+fn try_get_this_program<C>() -> Option<&'static Program<C>>
+where
+    C: ProgramCollect<Enum = C> + 'static,
+{
+    THIS_PROGRAM.get()?.as_ref()?.downcast_ref::<Program<C>>()
+}