Closes #29

core/multiplexing.h

@@ -3,18 +3,37 @@
 #define MULTIPLEXING_H
 
 #include <cstdint>
+#include <string>
+#include <vector>
 
-/** @brief Unconditional signal, selector, or single-value branch. */
+/** @brief Signal participation in multiplexing. */
 enum class MultiplexRole {
     Unconditional,
     Selector,
-    Branch
+    Branch,
+    BranchSelector
 };
 
-/** Basic multiplexing: one unsigned selector per frame, one raw value per branch. */
-struct Multiplexing {
-    MultiplexRole role = MultiplexRole::Unconditional; /**< Signal participation in multiplexing. */
-    std::uint64_t value = 0U;                          /**< Required raw selector value; used only by branches. */
+/** @brief Inclusive raw selector range, without expanding individual values. */
+struct MultiplexRange {
+    std::uint64_t minimum = 0U;
+    std::uint64_t maximum = 0U;
 };
 
+/** @brief Basic markers and optional explicit extended multiplexing condition. */
+struct Multiplexing {
+    MultiplexRole role = MultiplexRole::Unconditional;
+    std::uint64_t value = 0U;           /**< mN fallback when no explicit ranges are supplied. */
+    std::string selector;               /**< Parent selector name within the same frame. */
+    std::vector<MultiplexRange> ranges; /**< Alternatives for the named selector; override mN. */
+};
+
+inline bool IsMultiplexSelector(MultiplexRole role) {
+    return role == MultiplexRole::Selector || role == MultiplexRole::BranchSelector;
+}
+
+inline bool IsMultiplexBranch(MultiplexRole role) {
+    return role == MultiplexRole::Branch || role == MultiplexRole::BranchSelector;
+}
+
 #endif